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

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

[Adam]

doc for

Answer 1

[hani daniel]

Hi Star Strider,

Thank you for your answer.

Regards

HD

[Adam]

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.

Answer 2

[Stephen23]

>> M = bsxfun(@plus,2*(0:2),3*(0:3).');
>> sum(M(:))
ans =  78

Answer 3

[hani daniel]

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

Answer 4

[Star Strider]

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.

[Star Strider]

hani daniel’s Answer is copied here:

Hi Star Strider,

Thank you for your answer.

Regards

HD

[Star Strider]

My pleasure!