Creating a Polar Grid in MATLAB for Contour Mapping - Easy Guide

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Saladsamurai
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Here is what I am working on.

Picture1-29.png


I know it may seem stupid, but I am very new to MATLAB.

I do not understand how to "create a grid in the x-y plane with domain r from .05 to .75
and theta 0:5:360"

I have created a "grid" using meshgrid...but I can't seem to wrap my head around doing it in polar

I have done this to create a meshgrid before:

Code: 
x1=-0.5:0.01:-0.1;
x2=0.1:0.01:0.5;
x=[x1 x2];

y1=-0.5:0.01:-0.1;
y2=0.1:0.01:0.5;
y=[y1 y2];

[X,Y]=meshgrid(x,y);

Can someone help me extend this to Polar ?
 

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As a matter of fact, I guess I do not understand most of this...

Why would I have to calculate the "distance to each point?" That is just r is it not?

wtf
 
Can anyone help me to interpret this correctly? I am about to go off the deep end here.
 
Yes, R is the distance from the charge to the point. You have to calculate it because MATLAB doesn't do polar grids. Do have to do the conversion from cartesian to polar coordinates yourself. Does this help?

-Kerry