Help :)

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@brave fossil

LuluFire23 Uploaded Some Code

I'm a beginner. Any help is great! I need help making histograms on Juypter notebook or Python application. I can not figure how to fix my numbers to match my data. In the txt file, are the ascending scores . I need that data to create a histogram . For example how many students scored 0's, number for students scored 3's and so forth. I hope this is understandable.

Attachment: cleanData2.txt

0
0
0
0
0
3
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[fleet kettle]

is there any code

@brave fossil https://www.w3schools.com/python/matplotlib_histograms.asp

[brave fossil]

f=open('dataClean2.txt', 'r')
print(f)
import matplotlib.pyplot as plt
import os
import numpy as np

a=[]
for x in f:
if x[1] == '':
print(x[10])
b = int(x[0:2])
else:
b =int(x[0:2])
a.append(b)
print(a)

plt.title("Summer 2023 ALEKS Placement Scores")
plt.hist(a)

@fleet kettle

[fleet kettle]

what's the problem

[brave fossil]

let me try to explain. The numbers are in a list of scores, I am trying to fix the graph to show how many scored 0's, how many scored 3, how many scored 4,5 , 6 and etc. Do I need to add x= 0,10,20,30,40... and y= 0,10,20,30,40,50.. does it look right? x axis is the scores the 72 students placed and the y axis is how my has 0's, 3's,4's,5's , etc.

[fleet kettle]

sounds like an issue with matplotlib itself

look into the docs

i mean user error not the library

[brave fossil]

i will try

thanks

[gilded tartan]

Does that not look right to you?

[brave fossil]

no because, How does "0" have 16 when there iare five 0's?

[fleet kettle]

um

[gilded tartan]

A histogram depends on your bin size

[fleet kettle]

yeah

i think you're misunderstanding what a histogram is

if you want it so that instead of the graph showing ranges in the X axis, it shows each individual value, then use a bar graph

but given the range of your data a histogram does make more sense actually.

as wang said you can change the bin size to fix it. in your last line of code, have it say
plt.hist(a, bins=len(dict(zip(a,[a.count(i) for i in a])))

this makes it so your plot has as many bins as there are unique items in the array a. i'm in bed rn can't check to make sure this works right

@gilded tartan is this a right way to do it?

https://www.pythonpool.com/python-count-unique-values-in-list/

[gilded tartan]

You could do it like that depending on the data

@brave fossil You just gotta experiment with your bins if you want to keep using a histogram

Or use a bar plot