summation divided by summation

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Onur Demir
Onur Demir 2017-11-28
编辑： per isakson 2017-11-29
Hey, the beautiful pupil of the world. I'm trying to implant the formula below to MATLAB. I wrote the denominator and the numerator in different 'for' loops but it doesn't work like that. then, I tried to use special sum code but it didn't work either. so, could you help me to solve this problem?
here is the code I used;
a=2;
l=2;
d1= (sum(l,l,0,l))*(r1.^a)./(sum(r1.^a,l,0,l));
d2= (sum(l,l,0,l))*(r2.^a)./(sum(r2.^a,l,0,l));
thanks in advance.
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Jan
Jan 2017-11-28
@Onur: Did you consider the advice concerning "sum"? sum() is a built-in function, but calling it like sum(l,l,0,l) is not valid. If your "sum" is a user-defined function, use a different name, because shadowing important built-in functions is not an error, but very confusing.
Onur Demir
Onur Demir 2017-11-28
Everyone, I'm really appreciated that you helped me. I finally find my mistakes and solve them. Now I have another problem. If you want to help me, please check this page; https://www.mathworks.com/matlabcentral/answers/369732-implementation-of-the-cross-correlation

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回答（1 个）

Walter Roberson
Walter Roberson 2017-11-28
Change your / to ./
And you should probably have about 30 or 40 lines of comments explaining in detail why you feel it is necessary to name your variable or custom function sum in conflict with the standard MATLAB function sum()
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Onur Demir
Onur Demir 2017-11-28
编辑：per isakson 2017-11-29
Walter, I'm really appreciated that you helped me. I finally find my mistakes and solve them. Now I have another problem. If you want to help me, please check this page; https://www.mathworks.com/matlabcentral/answers/369732-implementation-of-the-cross-correlation

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