matlab ,THETA and RHO must be the same size.

matlab ,THETA and RHO must be the same size.
>> theta = -pi/2:pi/10:pi/2;
>> gain=abs((sin(4*theta)/(4*theta)));
>> polar (theta,gain,'r-');
Error using polar (line 61)
THETA and RHO must be the same size.

gain=abs((sin(4*theta)./(4*theta)));
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注意这里的除法要用 ./