# how to represent 30, 60, and 45 degree on matrix in Matlab?

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Prerna Surbhi on 5 May 2016
Answered: CS Researcher on 5 May 2016
i want to represent 30 degree,60 degree and 90 degree on matlab? just like 45 degree is represented as
[-1,-1,2;-1,2,-1;2,-1,-1]
Walter Roberson on 5 May 2016
How is that matrix being used? Is it, for example, the mask being used for conv2() ?

CS Researcher on 5 May 2016
You should always give out as much information related to your question as you can. Help us to help you. I did not completely understand what you mean by representing angles in MATLAB. It is extremely vague. Do you mean rotation matrix? If yes, then it is given by (for a 3 x 3 case)
R = [ 1 0 0
0 cos(theta) sin(theta)
0 -sin(theta) cos(theta)]
The theta is in radians. How did you get the matrix that you have for 45 degrees?

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