How can I change the spacing between gridlines on a polar plot?

When I draw a polar plot the spacing between the two circular grid line is 2. But I want to have 2.5 spacing

Answer 1

[Walter Roberson]

polar() makes no provision for changing this.

If you want to do it then you will need to read through polar.m and see how it constructs multiple axes, and how it constructs the circles as lines on the plot. Then either copy the source to polar into a new function and modify it for your needs, or else use polar as always but afterwards find the hidden axes and remove the drawn circles and draw new ones.