在Matlab中生成正弦波模式

Question

How can I generate the following in Matlab?

and How generates these patterns :

Answer 1

Like this:

f= % you choose
A=repmat(sin(linspace(0,f*(2*pi+pi),256)),[256 1]);

imshow(A)

Explanation: linspace creates linearly spaced point to control the size of the image (change 256 by something else). repmat repeats the sin wave every row if the image.

Change the initial and final angle to control the behaviour in the corners