How to convert radians to degrees?

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Rohan Repale 2013-5-21

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https://ww2.mathworks.cn/matlabcentral/answers/76522-how-to-convert-radians-to-degrees

评论： Ivan-V-Timofeev 2014-11-4

Hi, I have this code,

clear all, close all, clc, 
r = 0.08;
t = 2;
for n = 1:180,
  M(1,n) = r*cos(t);  %x length from center
  M(2,n) = r*sin(t);  %y length from center
  t = t+2;
end

It is meant to find the x,y distance from the center of a circle with fixed radius (Basically calculating x,y coordinates of circumference).

However the coordinates are coming wrong and it is because Matlab is performing calculations in radians rather than in degrees. (I cross checked the values with calculator) And I don't know how to convert to radians, and none of the forum results made sense to me.

Thanks, Rohan

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回答（3 个）

José-Luis 2013-5-21

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https://ww2.mathworks.cn/matlabcentral/answers/76522-how-to-convert-radians-to-degrees#answer_86190

编辑：José-Luis 2013-5-21

在 MATLAB Online 中打开

There is a built in function for that:

doc deg2rad

But it is rather trivial to implement it yourself:

 myTrans = @(x) x./360.*(2.*pi());
 myTrans(180)
 ans =
    3.1416

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Rohan Repale 2013-5-21

@James, mathematically speaking the other suggestions must work as well, but the output was not matching my expected output. But when I used sind and cosd, it worked perfect. Maybe I was not doing it right. Anyways thanks for the help