Matplotlib pyplot How to enforce axis range

Question

I would like to draw a standard 2D line graph with pylot  but force the axes  values to be between 0 and 600 on the x  and 10k and 20k on the y   Let me go with an example     import pylab as p  p title save file  p axis  0 0 600 0 1000000 0 2000000 0     define keys and items elsewhere   p plot keys items  p savefig save file  dpi 100    However  the axes still adjust to the size of the data   I m interpreting the effect of p axis to be setting what the max and min could be  not enforcing them to be the max or min   The same happens when I try to use p xlim   etc   Any thoughts   Thanks

User · Answer

Calling p plot after setting the limits is why it is rescaling  You are correct in that turning autoscaling off will get the right answer  but so will calling xlim   or ylim   after your plot command    I use this quite a lot to invert the x axis  I work in astronomy and we use a magnitude system which is backwards  ie  brighter stars have a smaller magnitude  so I usually swap the limits with  lims   xlim   xlim  lims 1   lims 0

User · Answer

Try putting the call to axis after all plotting commands

User · Answer

I tried all of those above answers  and I then summarized a pipeline of how to draw the fixed-axes image  It applied both to show function and savefig function    before you plot   fig   pylab figure   ax   fig gca   ax set autoscale on False     This is to request an ax which is subplot 1 1 1     During the plot   ax plot  You plot argument     Put inside your argument  like ax plot x y label  test   ax axis  The list of range     Put in side your range  xmin xmax ymin ymax   like ax axis  -5 5 -5 200    After the plot    To show the image    fig show    To save the figure    fig savefig  the name of your figure       I find out that put axis at the front of the code won t work even though I have set autoscale on to False   I used this code to create a series of animation  And below is the example of combing multiple fixed axes images into an animation

User · Answer

To answer my own question  the trick is to turn auto scaling off     p axis  0 0 600 0  10000 0 20000 0   ax   p gca   ax set autoscale on False

[python] Matplotlib/pyplot: How to enforce axis range?

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