#help-33
1 messages · Page 13 of 1
OF THE FUNCTION
WHAT OTHER RELATIONSHIP DO YOU THINK OTHERWISE?
YES
For example
X=1, and y=1, what do you think is the relationship between the two?
they both equal 1
That you can able to see what function are we using using only the x and y values
YES EXACTLT
i know that
function= relation
ok so f(x)=y
x=1
y=2
f(1)=2
what the hel
so f=2
isnt that emma watson
whoah lmao
ok ill try to understand what u just said
Yes woah, isn't that just josuke?
relation=output
Nah, output and input shows the relation
If you have both of those, then you can see the relationship
This isn't the function. It's the output also
It would only be a function if there's an equation to the other side
We just call it function of x
f(x) = x -> function
DUDE
f(x) -> output
I JUST TOLD YOU EARLIER THAT F(X) IS JUST WHAT WE CALL THE FUNCTION OF X
NOT F(X) = FUNCTION
BEFORE THAT
NONO
LOOK AT THE TIME
ur only getting the ones that say that
O I forgor we have different time
Brahs function is just a machine that gobbles up a values and spits out y values
yes
so the relation
YES THAT WHAT I SAID EARLIER
yeah f(x) is notation for a function
I NEVER SAID THAT
wtf is a notatio
I SAID THAT Y AND X VALUES SHOWS THE RELATION
Y value is relation because y is a variable just like x and they are related to each other. For example y = x is a relationship that means y and x are equal
the relation of functions
You even get it at first
Like the way you write something
LIKE I THOUGHT YOU UNDERSTOOD
so x=2 y =-123232923832
x = y
BRUH
F(x) can often be interpreted as y, but in some cases y can only be described as having a relationship with x, but not a function
I WAS JUST COPYING U
THATS WHYTEHEERE IS A QUESTION MARK
Yes
so function = y values
Ye
Could also be z values, a valued, any other variable values
Well the y value of the function is 2, you don't just say function = 2
i dont even know what u are saying anymore
Hm
my brain is so fogged up rn
I think it's useless to be so strict on the difference between y and f(x)
cause of this guy @spark berry
You can just view them as the same thing and in years you will see the difference
so would that mean
Before that I doubt school will teach you anything weird
x values are also a function
Well
Functions have inputs and outputs. If you're inputting y and outputting x that's possible. To write the function you would write f(y) instead of f(x) since the variable you're inputting is y now, not x
The thing in the parenthesis is just the input of the function
But normally school will only give y values as the output and x as input
It's just the standard
It could be anything tho
hmm
Well you haven't defined what the function is yet but if the function was f(x) =x AKA y = x, if x is 1 then y is indeed 1
i think imma just take a little break then come back and read what u guys said currently i dont think my brain can process anymore information
If it were y=2x AKA f(x) = 2x, your y value at x= 1 would be 2. You would denote that as f(1) = 2
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How to get the percentage error?
$\frac{|Experimental-Theoretical|}{|Theoretical|}*100$
miky
How can i tell whats experimental and theoretical, sorry getting percent error is new to me
the experimental is the calculated value, the theoretical is the known value (not sure though trying my best to remember)
So based on my given table, the gcal is the experimental while the -9.8 is the theoretical?
from what I understand yeah
Alright thanks
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Hello
Basudev
Basudev
n! = n * (n-1) * (n-2)!
Yes
Ann
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Anyone know how to do this?
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Been stuck on this question for a solid 3 days now. Tried using the hint in order to get some sort of log odds to help out with getting the answer...still not entirely sure on how I'd even do it.
3rd year university, Machine Learning, Discriminant Analysis + Bayes Theorem
Anyone able to help me out with this hellish question?
I've managed to get some form of log odds but it doesn't look like I could rearrange it to get the form they've requested in the question.
Glad to see someone reacted to this 
you're welcome!
im most sure nobody would help you here
you can try the data science server
I'll have a look and hope

Show your log odds.
Will do
It's pretty messy (and I'm not brilliant at ML so be warned)
This is as far as I’ve got. Feel free to pick through everything and…yeah
I'm not brilliant either, but I'm telling you to show your work, which will attract more attention to your question
Are you labelling the first term as $\theta_n$?
草w
You want the whole thing as $\theta_0, \dots, \theta_n$
草w
I thought the first term would be able to get me thetan but there's no x in that term. So in the second image I've converted to use the whole term, combined into just thetan where it's the sum from j = 1 to n of thetaj
The terms corresponding to independence of $x$ is $\theta_0$
草w
That makes sense
Mostly from linear regression which we did a fair amount, not all terms have x in them but all but one do. As shown as well with the sigmoid function.
Still wondering how I'd go from what I've got to get the sigmoid which is the main thing confusing me
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@vivid axle Has your question been resolved?
<@&286206848099549185>
And of you guys able to assist me?
@vivid axle Has your question been resolved?
@vivid axle Has your question been resolved?
I Need Help With This
@vivid axle Has your question been resolved?
When I understand it right you have to look at these points, imagine there is a coordinate system and you've learned that no y in a function has two different x points
Thanks
Yes I’m still in need of some help with this question.
Please nobody else just but in and post their own question or random comment.
last one
.close
You have (6,5) and (6,-9)
Come on guys. Get in a separate channel. Or look in #❓how-to-get-help
@vivid axle Has your question been resolved?
<@&286206848099549185>
post this in #linear-algebra
Alri
@vivid axle Has your question been resolved?
i onder
hi
@vivid axle Has your question been resolved?
so calculate the general form for q
then test the answers to see which is the inverse
ill have paper in a few min
can someone help me?
@frail summit for what
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can anyone help me with the statistics problem
sigma is not 1.2
sigma is unknown
it's the z-score of this particular can you grabbed that is 1.2
no,
it says
A randomly selected can [...] is 1.2 standard deviations above the mean.
you do not need to know the value of sigma.
you want to know the percentage of values with z-score 1.2 or above
Anything above 1 standard devatiation from the mean is approx 13.6% + 2.1% + 0.1% ≈ 15.8%. Then because it's 1.2 standard deviation it's a little bit less than this
1 minus this, yes.
got it
thanks
and i was also confused with this question
Why D is not right
@stoic saddle 😭
"lower pulse rates than 3/4 of the women" refers to values below the bottom of the box in the women's column
and that doesn't cover half of the men
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I was j wonderin but if u have a function (f(x))/(g(x)) and u want the derivative. Instead of quotient rule couldnt u use the extended power rule aswell?
so like move g(x) up with and turn the power negative
And then product rule, yes
That is how the quotient rule is derived
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yes
@twilit arrowthe answer is -pi/15 ?
i’m not sure
sure of what
how to find all solutions
i have the answer on my werkbook but i dont know how to get it the answer is 2kpi/15 @twilit arrow
wait
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when we have sin(arcisin(x)) = ...
we have to verify that x€[-pi/2; pi/2]
but when it's tan(arctan(x)) = ... we don't need to verify an angle right?
what
sin(arcsin?
,w range of arctan(x
tan(arctan
damn Mr gamer is truly a gamer
tan(arctan(x)), here x can be anything, but i dont understand your question
x can be any real, but its arctangent only returns angles of the right half of the circle
I hope that clears things up
tan(arctan(x)) just be simplified to x, same for sin(arcsin(x)), provided that x satisfy the original domain
no i mean for instance you have to verify that arcsin(2x) - arcsin(xsqrt((3)) = arcsin(x)
then you apply the sin function but since sin is 2pi periodic you have to verify that inside the sin it's between -pi/2 and pi/2
so my question was what the angle when we apply tan
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I'm very confused when it comes to JK flip-flop
How can i solve this
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no
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Trial and Error. Check if Q=1 satisfies the circuit. If it does not, check 0.
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If U1 = 1 and U2 = 2 and U(n+1) - 2Un + U(n-1) = 1. find U1000 the 1000th term of the sequence .
Hey guys which one is the correct answer U1000 = 499501 or U1000 = 1000?
@signal ferry Has your question been resolved?
$$u_{n+1}-2 u_{n}+u_{n-1}=1 \implies (u_{n+1}-u_n)-(u_n-u_{n-1})=1$$
秋水
so ${ u_n-u_{n-1}}$ is an arithmetic sequence with common difference $1$, and $u_2- u_1=1$, so $u_n - u_{n-1}=n-1$
秋水
$$\begin{aligned}
u_{1000} &= (u_{1000}-u_{999})+(u_{999}-u_{998})+\dots+(u_2-u_1)+u_1\
&=999+998+\dots+1+1 \
& = \frac{1000 \times 999}{2}+1\
& = 499501
\end{aligned}$$
秋水
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how would i go about solving this?
how do i begin solving it with this info?
bruh what really
no offense but that cant be right
what have i been learning this whole time 😭
$$\sin x+\cos x=\sqrt{2}\sin(x+\frac{\pi}{4})$$
秋水
i found that x=0, but looking at the answers says that there are 2 other answers, pi/2 and 2pi
wait am i like actually dumb
lemme check again
i put in cos(0) + sin(0) into my calculator and it comes out as 1
so like yeah x=0
but how did they get the other values?
im getting so confused rn
same
0 is the only answer
💀
the answer is x=0,pi/2,2pi
but how
WDYM
i dont get how
$$$$\sin x+\cos x=\sqrt{2}\sin(x+\frac{\pi}{4})=1$$
秋水
Compile Error! Click the
reaction for more information.
(You may edit your message to recompile.)
so $\sin(x+\frac{\pi}{4}) = \frac{1}{\sqrt{2}}$, and $x+\frac{\pi}{4} \in [\frac{\pi}{4}, \frac{9 \pi}{4}]$
秋水
how did you get the root2sin thing?
so $x+\frac{\pi}{4} = \frac{\pi}{4}, \frac{5 \pi}{4}, \frac{9 \pi}{4}$
秋水
$$2 \sin x+3\cos x = \sqrt{13}(x+\arctan \frac{3}{2})$$
秋水
HOW
wait maybe i remember
hold on
ok where did arctan 3/2 come from?
i get the root 13 part tho
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How would I find the maximum point for this equation?
where e is euler’s number btw
honestly plug in a really big and really small number
Alr I’ll try
You basically have the function f(t) = A(1 - e^(-6t)) - Bt where A & B are constants.
You can find the max by finding critical points using the derivative
Yeah that makes more sense thank you I understand now
I don’t know how to mark as solved lol
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How should i work out d and e?
so 10% is 2000 minus 1% twice which is - 400, so its 1600
is that an okay way to work it out?
Do you have a calculator
Well yeah
Use that
What should i do on the calculator?
Find what 8% of 20000 is
Or actually forget tha
Just type 20000(1.08)^x until you reach somewhere near 30000
so 6 times then its above 30k
Yeah
So should i just write 20000*(1.08)^6 power as my working out
Okay and for question e?
Ooh okay i think i understand thanks
👍
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does every exponential function eventually outscale every linear function
if the exponent is bigger than 1
Are you thinking of |exp(a)| > |a| ? depends on the norm you choose
It is generally false as well, just look at an example over the real numbers with a = -1
this will be false
i think they mean linear functions with degree 1 and a > 1
such as a^x > kx + b for x->inf
@upper gust Has your question been resolved?
my question is if
lim x-> to inf
(e^x)/ax with a > 0 goes to infinity
and
lim x-> to inf
ax/e^x with a > 0 goes to 0
or in other words if every exponential function as x approaches infinity will surpass every increasing linear function
sry wasnt clear enough
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The quadratic equation ax² + bx + a =0 with b>2a>0 has
(A) two equal roots;
(B) two roots that are opposite each other;
(C) two roots that are inverse to each other;
(D) two roots with opposite sign and different absolute value;
(E) no real roots.
Well, to see what it would be, let's try and set a, and b to two numbers that satisfy the inequality
So assume we have b = 5 and a = 2
This would give you 5 > 4 > 0 for the inequality
Now knowing that, can you substitute those values into the Discriminant of a quadratic and see what it would get you?
i think i know the outcome now
D= 9
right, this should tell u what the answer should be
I have a class right this second but good luck !
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Hi there i need some help with the following question: Given isosceles trapezoid.
Given that: the smallest base is 3 cm, the largest base is 9 cm, and
The stems are 5 cm
- I need to find the hight of the isosceles trapezoid
- I need to find the space of it
I know that the angles of the biggest base are congruent
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I have:
M = {{0, {1}, 2}, {{1}, 2, 3}, {{1}, 2, {3, 4}}}
N = {{0,{1}},{{1},2,3},{1,{3,4}},{{1},2}}
What is ∪{M,N} and ∩{M,N}
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Hi, I was wondering on how to solve this paticular part of this trignometry question
Tan(-x)=-tan x
The use tan (90+theta) formula to convert to cot theta
Put in the value and voila
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does this work
I've found the slope -3/(2^9) at x = 16, but having difficulty finding tangent
So far I have $$y = -3/(2^9) * (x - 16) + 1/8$$
correct, simplify and you're done
I get the wrong answer
lost the minus on slope
aaaa, actually
studying lang calculus
$$-\frac{3}{2^9}x + \frac{3}{2^5} + \frac{1}{2^3}$$
16=2^4
oh lol
studying lang calculus
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is this right?
Is the red line y = x - 1?
of course no
So he's just asking for question b) only
y = 7-x
yes
If you draw y = x - 1 it might help
They aren’t showing their work. That’s just the question
yh i did but i put in those co ordinates n it said im wrong
am i ? vuz i think im right
ah okay
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the function: F(x) = the integral of f(x,t)dt, can someone give me an example where F(x) is non continuous
but defined
whats unclear?
its parametric integrals
alright
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Im so lost help please :)
so for part a, its just asking which image shows the locus of points (also known as the set of points) such that they are 6cm away from Q or less
do you have a guess for what the answer might be?
b?
yup
because anything outside of that green circle would be more than 6cm away from Q
i see but i dont really get how the colours correlate
the green is what the problem refers to as the shaded region
so the green is whatever satisfies the condition in the problem, which in this case was being less than 6cm away from point Q
that means that every point in that shaded green circle is less than 6cm away from Q
once you enter the non shaded region (in this case white), your condition is no longer satisfied
right so would question b be a?
this one asks for all points closer to P than Q
if A is the answer, then your claim is all the points in the green circle are closer to P than to Q, which is true
BUTTTT there are other points that satisfy the condition that lie outside of the green circle that are closer to P than to Q so answer A is not quite right
for example consider the right corner of A, the points in that area are closer to P than to Q, but they are not in the green shaded region
im so lost im srry 
its okie, its a bit hard to explain over text since this is so visual
let me see if i can show you it another way
ok thank you
okay, look at A where ive drawn a red point and a blue point
so for part b we want the locus of points that are closer to P than to Q
now the question is, does the red point satisfy that locus (aka is the red point closer to P than to Q)
yes p is closer than q
yes 🙂
now the next question is, does the blue point satisfy that locus (aka is the blue point closer to P than to Q)
no its further from p than q
good 🙂
okay now the question is, what region will have points where the points are closer to P than to Q?
so think about all the different red points i could draw where theyd be closer to P than to Q
(that will give you your answer because it will be one of the answer choices)
here ive drawn some more red and blue points to help you see it better
as you can see, all the red points are closer to P than to Q
while all the red points are NOT closer to P than to Q
so if i painted every possible red and blue point, which answer choice would that look like?
hmm, how about you try part c and then come back to part b
would that be d? im just guessing.
no not quite, because you have points in the green region that are NOT more than 6cm from P
for example, some points near P are less than 6cm from P
ill just ask my teacher tmrw to help me with this i think its better in real life srry for wasting your time 
its alright, hopefully youll understand it with your teacher
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Not sure how to solve this, I’m assuming initial velocity isn’t 0 for this then?
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.close
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idk how to begin doing this
if theyre perpendicular then the gradients are negative reciprocals of eachother
so m1 = -1/m2
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hi
i need help
for this question
do i 6-12
or 6+12
because
i subtracted the y to make it one variable
then i did 4-2
2x
That's not how signs work
?
You subtract -2x
yes
So it's actually adding 2x
because i multiplied it by -1?
Because - negative = + positive
ok
Yes
0 = 6x - 6 yes
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Need help
Need some help with double integrals and polar coordinates, I think I have written in the right way but i don't get the correct result:
,rotate
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Anyone?
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hello, i want to solve the equation d(x,y) =< d(x,z) +d(z,y) could you help me please ?
i tried to appear what is d(x,z) + d(z,y) but i don't know how to expose it
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is correct?
after you've substituted and changed the variables to u, the integral of 1 is u
your variable is u
so when you integrate 1, you get your variable, u
you're integrating with respect to u
yes
i stil dont get it
$\int 1\ du = u$\
$\int 1\ dx = x$ \
$\int 1\ dv = v$
Zybikron
+C
once you have changed all of your variables over to u, you are integrating with respect to u
so the integral of 1 is u
something like this
@mystic minnow
in this, i should take x as u or sen(2x)
or instead, do integration by parts
you still changed your bounds again. The 0,2 bound is on u, the 0,1 bound is on x
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basically it's sin(x) = 0.92
hence
x = arcsin(0.92) + 2πn or x = π - arcsin(0.92) + 2πn
manipulate with value of n to get next three solutions
and next solution won't be 2 btw
let n = 0
then:
x = arcsin(0.92) (solution provided in the sheet) or x = π - arcsin(0.92)
,w π - arcsin(0.92)
it's close to 2, but it's not 2
let n = 1 and check
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You have similar triangles
TVS and UVR
Use the ratio of side lengths that you know and call UV x
Or whatever variable you like
@fresh oriole does this help at all?
everything did until i had to do ratio sides
So basically due to having similar triangles their sides have a common ratio that changes the side length from one of the triangles to the other
Nice
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confused
what are you confused about?
when u do the substitution, r u changing the equation?
how do u use the oddness and evenness so to speak
i dont get the process, where do they change the limit from x to u
how do they go back to du to dx
dont u needa resubstitute
what's the point then
the point is to cancel out both sides
in an odd function f(x) = - f(-x)
so the area cancel out
the area on the right cancels with area on the left side
this image is kinda bad
i get that it cancels out
but
couldnt u do this to any func and take it out this way
does subbing in u=-x change the expression itself
it does not change
the integral is the same
but instead of being integrated by x, is integrated by u
?
how does it use the property of odd-ness
what do you mean?
f(-x)=-f(x)
but at what point do they put a -
how does the substitution make use of the property
what am i supposed to see blood
f(-u(x)) = -f(u(x))
sure
lower limit: u(a) = 0
upper limit: u(b) = 3
look on the right
then find a and b
a is either 1 or -1
and b is either 2 or -2
but sqrt(x² -1) says that x²-1 >= 0
x² >= 1
x>= 1 or x <= -1
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calculator recomondstions?
what is your intended major or what classes are you planning on taking
?
i’m only in hs i’m taking calc next sem
I would look into finding a calculator that
-
can make a graph (so you can graph functions)
-
and has an ability to solve finite integrals (so that you can check your answers)
so that would be the TI-83 or TI-84
I would strongly recommend you to get a used calculator and then clean it up.
The best calculator from Texas Instruments is the TI-Nspire (there are multiple models with differing features)
I got a used one for a steal of $70 at a Pawn Shop. So I would look at local places to see if someone is selling a calculator
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Hi, am converting a equation of the parabola into vertex form
Wondering if this looks correct so far
I have to relearn that factoring method which is why I didn't finish lol
complete the square
you make the expression into a perfect square
of the form
a^2 + 2ab + b^2
is it correct so far though?
so you can factor it into (a+b)^2
you can divide by 2 as well
I can simplify that before factoring?
how does that rule work?
actually nvm
but good to know
here so far
am trying to find a number that works atm
I don't think there is one..
<@&286206848099549185>
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how 😦
What did you do for the first one?
guessed im ngl
Critical numbers are values of t that make h'(t)=0
So, take the derivative, then find where it's equal to 0
gachu
i dont know how to factor it
once i get to the first derivative @trim quest
What'd you get for the derivative?
3/4t^-1/4-1.5t^-3/4
Maybe it would help if we made a substitution?
like a = t^-1/4
if we let $a=t^{-\frac{1}{4}}$, then we have $\frac{3}{4}a-\frac{3}{2}a^3 = 0$
tatpoj
This is good
$\frac{3}{4}t^{-\frac{1}{4}} - \frac{3}{2}t^{-\frac{3}{4}}=0$
tatpoj
This is what you want to solve
You can get rid of the negative exponents by multiplying both sides by t^(3/4)
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would this be the same as e^1 = (x+3/2x+1)
yes
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Lately I have been interested in converting coding problems into mathematical functions, and this is one of them :
You start with X adult cows and 0 baby cows. Once per minute, for every pair of adult cows, one baby cow will be bred. A baby cow takes 2 minutes to become an adult. So with X starting adult cows, how many of them will there be in Y minutes.
With Z being the final number of adult cows, your equation should only be expressed using X, Y and Z as variables. With f(X, Y) = Z
the code is
The first thing I taught of is using series
and i'm stuck on that right now
@thorn sparrow Has your question been resolved?
@thorn sparrow Has your question been resolved?
Idk if append is what you want here
I would do something like that:
babycow is a vector [a, b] where a is the number of baby cow born the minute before and b the number of babycow born this minute
then at each minute, adultcows += babycow[0]
babycow[0] = babycow[1]
babycow[1] = int(adultcows/2)
did u work out an expected total adult cow value for 4 minutes and starting with 2 adult cows?
Im getting a logic error of 5 total adults by the end when I think it should be 4
guys give me a minute to read before I respond I usually do this in french
ja habite eccosse
hahaha
did that work
bien essaye
j'ai vécu en France
ohhh merdeeee
j'habie en écosse
jai adore le fromage
that works
it mean i liked the cheese
tho it's written like this: j'ai adoré le fromage
ok let me read the reply
that would work too but i kept adding it so I could print the progression of numbers
wait
I might have it
omg
this works for my specific set case
not tried it with any other numbers
def cowCalc(x,y) :
minutes = x
adult_cows = y
newbabies = [[] , []]
for minute in range(minutes) :
newbabies[0].append(adult_cows//2)
newbabies[1].append(minute)
print(newbabies[0])
print(newbabies[1])
for x in range(len(newbabies[0])) :
if len(newbabies[0]) > 2 :
if newbabies[1][x] == newbabies[1][minute-2] :
newbabies[0][minute] -= newbabies[1][x]
adult_cows += newbabies[0][minute-2]
else :
pass
return adult_cows
print(cowCalc(4,2))
it returns 4 adults
which is what my flow chart got
you're kinda losing me with your code tho lets start with the problem you mentioned
what did you mean by that
i have no errors running my code
noo I was coding mine from scratch
I was speaking about mine, don't think I was tracking the values correctly
uses a 2D array to track the amount of new babies and the minute they were born at
ahh ok so your keeping track of the results If i understand
oui
ok well this is what i get
if we track the minute they are born at we can compare it
if newbabies[1][x] == newbabies[1][minute-2] :
this is the age checker
x is looping through the entire array of values
and seeing if its 2 minutes old yet
and if it is it adds it and removes it from the total of babies
what are the params?
calling this minecraftCowConundrum(2, 15)
ok
so 15 minutes as 2 starting cows
can you try 2 starting cows and 4 minutes
to see what you get
ah ok
I have logic error in my code still

it'll be the same list but shorter
and the adult one is on the bottom
you should do a flow chart of like 2 adults and 5 minutes and see if it matches your code
i'm trying to find a relation to convert this into a math equation
I thought about using series
I would start with a table of values
but the thing is i'm using 2 right now if you think about it
my end goal once I find the solution to this is to be able to apply it to eaven bigger functions
ok im getting somewhere
Really!?


