Matlab中的三和 [英] triple sum in matlab

问题描述

我要计算以下总和:

我尝试使用以下代码:

 I = imread('C:\Users\Billal\Desktop\image.png');
[x,y,z]=size(I);
x=(1:x) ;
y=(1:y) ;
z=(1:z) ;
 Fx=ones(size(x));
 Fy=ones(size(y));
Fz=ones(size(z));
X=x*Fy';
Y=Fx*y';
Z=z*Fz'; 
 f=I(X,Y,Z);
sum1 = sum(f(:));
[x1,y1,z1]=size(I);
total = sum1/(x1*y1*z1);

但是结果是0.我不知道问题出在哪里?我正在关注本教程.

But the result is 0 . I could not figure out where is the problem ? I am following this tutorial .

https://www.mathworks.com/matlabcentral/newsreader/view_thread/126366

请帮助我解决这个问题.

Please help me to solve this question .

推荐答案

您可以一步完成此操作:

You can do this in a single step:

result=1/prod(size(I))* sum(I(:));

最后，方程式只是将整个图像的值相加.

In the end, the equation just adds up values of the whole image.

您链接到的问题需要对>和y的值求和.不需要，您只需要对索引求和，因此不需要所有这些Fx,Fy内容

The question you link to needs to sum over values of x and y. You don't, you just need to sum over indexes, thus there is no need of all those Fx,Fy things

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