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Why are my plots printing out of order?

asked 2018-09-14 00:11:37 -0600

nbenj582 gravatar image

Here is my code:

def lam(n):
    m = 1
    while (n+1 - m >= 0):
        m = 2*m
    return m/2

def inter(n,l):
    return [(n+1-l)/l, (n+2 - l)/l]

def f(a,b,x):
    if x>=a and x<=b:
        return 1
    else:
        return 0

for n in range(1,15):
    I = inter(n,lam(n))
    lst = []
    for i in range(101):
        lst.append([i/100, f(I[0],I[1],i/100)])
    scatter_plot(lst,markersize=20,aspect_ratio=0.1)

I know that the plots are printing correctly, they are just out of order for some reason. Any ideas?

Also, I know this is a terrible way to plot this. I wanted to use:

plot(f(I[0],I[1],x),(x,0,1))

but that doesn't seem to be working (it just gives me the zero function), so if you have any suggestions for that as well, that would be great. Thank you.

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Comments

1

For reference, can you mention what interface (command-line, sagenb, Jupyter notebook, CoCalc Sage worksheet) you are using? It's conceivable the answer may be different depending on this.

kcrisman gravatar imagekcrisman ( 2018-09-14 07:04:46 -0600 )edit

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answered 2018-09-14 06:27:48 -0600

eric_g gravatar image

This is an answer to the second part of the question only: you should use

plot(lambda x: f(I[0],I[1],x), (x,0,1))

Otherwise f(I[0],I[1],x) gets first evaluated with the symbolic variable x and returns the value zero (because the test x>=a and x<=b in f always fails with the symbolic x); this zero value is then passed to plot.

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Asked: 2018-09-14 00:11:37 -0600

Seen: 27 times

Last updated: Sep 14