You are calling compassplot() in a loop.
By default, each call to compassplot() removes all existing graphics on the axes -- so each call to compassplot() is deleting the previous compassplot()
You have four options:
- Use hold on before the while loop. That will cause the various compassplot() to accumulate onto the same axes. As you are not providing x values distinct from y values to the various compassplots(), this would result in all of the compassplot() sharing the same axes and getting tangled with each other. That is potentially a problem (but might be what you want.)
- Use figure or uifigure inside the while loop but before the compassplot() call. This will result in completely different figures being generated for the various compassplot()
- Use subplot() before each compassplot() call (including before the one before the loop). subplot() creates distinct graphics axes for the content to go into.
- Use tiledlayout() before the first compassplot() call, and then nexttile() before each compassplot() call. nexttile() creates distinct graphics axes for the content to go into, but does so in a nicer more modern way than subplot() does
