Changing the values on the x and y axis of a graph in Python
Question: if I had something like;

    
    
    import numpy as np, math as m, matplotlib.pyplot as plt
    def test():
        x = [1,2,3]
        y = [m.log(0.1),m.log(0.2),m.log(0.3)]
    
        fig1 = plt.figure()
        plt.plot(x,y)
        plt.show()
    

This will display a graph with the y axis showing negative numbers. I was
wondering how you make the graph display it as a logarithm instead (like what
the list y was initially defined to be).

Thanks!


Answer: Well the log of a fraction is negative, by the definition of a log. For
example 10^x=1/2, x _must_ be negative to get a fractional value. That is the
idea behind a log. So your best bet is to display with a log scale so that it
displays positive fractions.

~~The easiest way to do this would be to take`10^x` where x is the decimal
value, of every y value. Then you will have the y output as decimals, instead
of negative numbers.

Then you can set `.ylabel()` as "log scale".~~

**Edit:** I think what you are looking for is answered [on this stackoverflow
question](https://stackoverflow.com/questions/3100985/plot-with-custom-text-
for-x-axis-points) about making custom ticks. You should be able to use
`yticks` instead of `xticks` used in the answer.

