#How do I implement method add?

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teal gate
gloomy lightBOT
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molten sphinx
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try it first

teal gate
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i dont know where the method can be found

teal gate
molten sphinx
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well, what's your input and output

teal gate
molten sphinx
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close

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that's more like your data

teal gate
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[]

molten sphinx
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the matrices themselves are the input

teal gate
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these^

molten sphinx
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what?

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[] doesn't really mean anything on its own

teal gate
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i meant the matrix yea

molten sphinx
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so what should your output be

teal gate
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hmmmmm

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is my matrix also the output

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?

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im unsure

molten sphinx
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yes

teal gate
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okay good

molten sphinx
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you get a matrix from adding 2 matrices

teal gate
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yes i agree

molten sphinx
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with "add" you don't want to be modifying the original matrices, so you'd need to have 3 separate matrices for the 2 inputs and 1 output

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but that doesn't exist yet, so you need to make it

teal gate
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okay

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so i would need to create a new object?

molten sphinx
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yeah

teal gate
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what should i call it

molten sphinx
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result, output, sum (since it's adding), something along those lines

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just needs to match what it is

teal gate
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something like this?

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so i have created now three objects

molten sphinx
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what

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im so confused

teal gate
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wait

molten sphinx
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those types don't exist

teal gate
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oh sorry

molten sphinx
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the type needs to be a matrix, the same shape as the inputs

teal gate
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so

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now

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i have created one matrix

molten sphinx
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new output();
output doesn't exist

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you're using output as a type here

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you haven't created a matrix

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do you know how to create arrays

teal gate
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wait

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the output

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isn't that the name of the matrix?

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im confused

molten sphinx
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//                   v using as class
int[][] output = new output();
//      ^ using as variable
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the class output doesn't exist

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you need to create the matrix there

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do you know how to create arrays

teal gate
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oh it should be m2

teal gate
molten sphinx
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yeah, you need to do that

teal gate
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int intArray[]; right?

molten sphinx
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no, that's the variable

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creating the array itself

teal gate
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int[] intArray = new int[]{ };

molten sphinx
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matrices are just arrays of arrays, so you can't really use matrices if you don't know how to use arrays

molten sphinx
teal gate
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yes okay

molten sphinx
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but we don't know the values yet

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so we can't use the {} format

teal gate
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should i sett it to null

molten sphinx
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how would you create an empty array of a given size

teal gate
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?

molten sphinx
teal gate
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okay should put zero

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or you write size

molten sphinx
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by empty here i mean it does have elements, but they aren't specified

teal gate
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yes

molten sphinx
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answer the question...

teal gate
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i mean i learnt to write null

molten sphinx
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it's not useful here. this is the thing you want to return

teal gate
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then we dont write anything in it

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we just usethis []

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int[] intArray = new int[0];

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do u mean this?

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this is an empty array ----> int[] intArray = new int[0];

molten sphinx
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right

teal gate
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okay good

molten sphinx
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by empty here i mean it does have elements but they aren't specified

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so not a 0 length array

teal gate
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sorry bro i didnt understand the question

teal gate
molten sphinx
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you need to create a matrix of the same size as the input matrices

teal gate
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here is one

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array

molten sphinx
teal gate
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?

molten sphinx
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again, not zero elements

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empty as in not specified

teal gate
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not specified***

molten sphinx
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you need to create a matrix with the same length as the input matrices

teal gate
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hmmm i will try

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int[][] intArray = new int[m1.length][m1[0].length];

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is that correct?

molten sphinx
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yep

teal gate
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it dosen't work

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soemthing is wrong

molten sphinx
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that test looks really weird

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your code looks fine thonkhave you reran it

teal gate
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finally

teal gate
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im sorry for being dumb sometimes

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but thanks @molten sphinx

molten sphinx
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oh wait i misunderstood

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that's a weird way to do it, but i see what its going for now

teal gate
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how do i close this channel?