Summation in MATLAB in 4 dimenstion

Question

JAVAD 2023-2-16

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1913890-summation-in-matlab-in-4-dimenstion

评论： JAVAD 2023-2-20

采纳的回答： Torsten

在 MATLAB Online 中打开

I have a matrix with 4 dimentions.

I should sum values.

w(i,j,k,t)

k is constant.t is time

My problem is how to add t to loap.

for example for t=1, give me the results but I repeate up to 12. I need sumation for each t seprately and save it and then repeat it for 12 times.

How can do it?

sum=0
for i=1:i
    for  j=97:176
        if w(i,j,15,t)<0
            sum=sum+w(i,j,15,t)/(pm(i,j)*pn(i,j))
        end
    end
end

1 个评论
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Walter Roberson 2023-2-16

We advise against using sum as the name of a variable. It is very common for people who use sum as a variable name to find that they also need to call upon the MATLAB sum function. And besides, it confuses the readers.

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Answer 1

Torsten 2023-2-16

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1913890-summation-in-matlab-in-4-dimenstion#answer_1173410

在 MATLAB Online 中打开

for t = 1:T
  s(t) = 0;
  for i=1:i  <---- for i=1:i does not make sense
    for j=97:176
        if w(i,j,15,t)<0
            s(t)=s(t)+w(i,j,15,t)/(pm(i,j)*pn(i,j))
        end
    end
  end
end 