Hi,. I need support in doing a double summation in MATLAB. Thank you.

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hani daniel
hani daniel 2017-4-28
评论： Adam 2017-4-28
Hi,
I need to do the following double summation ∑(i=0,2)∑(j=0,3)〖(2i+3j)〗in a MATLAB program. The answer should be 78. Thank you.
HD

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采纳的回答

hani daniel
hani daniel 2017-4-28
Hi Star Strider,
Thank you for your answer.
Regards
HD
  1 个评论
Adam
Adam 2017-4-28
Please just accept the answer you are happy with. Don't add your own answer to just say which answer works and then accept that! You can add comments to people's answers.

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更多回答（3 个）

Stephen23
Stephen23 2017-4-28
>> M = bsxfun(@plus,2*(0:2),3*(0:3).');
>> sum(M(:))
ans = 78
hani daniel
hani daniel 2017-4-28
Hi Stephen,
Thank you for your answer, it is correct. However, as a beginner at MATLAM, I do not understand the bsxfun command. I was expecting to use a for loop type of solution. Please let me know of alternatives. Thank you.
Regards
HD
Star Strider
Star Strider 2017-4-28
There are likely several ways to code this (I assume this is a coding exercise, since the correct answer is provided).
This is one approach:
i = 0:2;
j = 0:3;
[I,J] = meshgrid(i, j);
f = @(i,j) 2*i + 3*j; % Anonymous Function
fmtx = f(I,J);
Answer = sum(fmtx(:))
I am not documenting it, leaving it for you to understand how it works.

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