How to change a matrix within a function

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Amir Belgi
Amir Belgi 2017-11-22
回答： Walter Roberson 2017-11-22
I want to pass a matrix into a function and to change the matrix within the function. For example, in my case I want to set some elements of the matrix:
function setRedComponent(Image,val)
Image(:,:,1)=val;
end
Image is a 3D matrix representing an RGB image.
I know I can return the image, but I prefer to use the function as follows:
I=zeros(64,64,3);
setRedComponent(I,255);
and not
I=zeros(64,64,3);
I = setRedComponent(I,255);

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采纳的回答

Walter Roberson
Walter Roberson 2017-11-22
function setRedComponent(Image,val)
Image(:,:,1)=val;
inname = inputname(1);
if ~isempty(inname)
assignin('caller', inname, Image);
end
end
This style of coding is not recommended at all!

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