creating a function for my repeating computation

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fafz1203
fafz1203 2016-10-18
回答： Walter Roberson 2016-10-18
I want to create a function for the following set of repeated computations i will be performing in my work.
d = ((x*b) - y).^2;
test = sum (d(:))/1000;
Your help is much appreciated.
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fafz1203
fafz1203 2016-10-18
please know that the value of x and y is different on every call, it takes different values of x and y every time it's called.

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回答（1 个）

Walter Roberson
Walter Roberson 2016-10-18
test = @(b, x, y) sum( reshape( (x*b - y).^2, [], 1) ) / 1000;
Now
result = test(b, x, y); %a call to the function
Question: do there happen to be exactly 1000 elements in y, so it is computing a mean? If so then
test = @(b, x, y) mean2( (x*b - y).^2 ); %if you have the image processing toolbox
test = @(b, x, y) mean( reshape( (x*b - y).^2, [], 1) ); %if you do not have image processing
For some shapes of x and b and y, it would be possible to use (:) instead of reshape()

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