Convert formula into coding form
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Hi, i don't know how to convert formula into coding form. Example of formula
theta(kx, ky) = arctan(dy/dx)
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Risposte (3)
Star Strider
il 1 Apr 2017
The arguments to the function do not match the arguments to the arctangent function. Are ‘kx’ and ‘ky’ the same as ‘dx’ and ‘dy’ or different?
One of these should do what you want:
theta = @(kx, ky) atan2(ky,kx); % The Values (Or Vectors) Themselves
theta = @(kx, ky) atan2(gradient(ky),gradient(kx)); % The Derivatives Of The Vectors
The atan2 function puts the returned angles in the correct quadrants. The atan function does not.
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Star Strider
il 1 Apr 2017
My function then changes to:
theta = @(kx, ky) atan2(In(kx,ky+1) - In(kx,ky-1), In(kx+1,ky) - In(kx-1,ky)); % Directly Using ‘In’
That should work.
John D'Errico
il 1 Apr 2017
Modificato: John D'Errico
il 1 Apr 2017
I'd strongly suggest that you start reading the getting started tutorials. This is a very basic question, although I honestly have no idea what it is that you really want to do here. If I had to guess, you need to learn how to write a function.
Using a four quadrant atan, this would do what you want.
theta = @(kx,ky) = atan2(ky,kx);
Or do this:
theta = @(kx,ky) = atan(ky/kx);
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Image Analyst
il 1 Apr 2017
I agree with John on this: http://www.mathworks.com/matlabcentral/answers/8026-best-way-s-to-master-matlab
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