MATLAB: Element to element sum

sum

i have X = [1 5 7 6 9 2 3 1 4 8 6 5]; and i want to do [1+5 5+7 7+6 6+9 …] how can i do that?

thanks

Best Answer

X(1:end-1)+X(2:end)

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MATLAB: How to sum the matrix element

Hi Eddy,

It is because in one of the for loop, you made sum as a variable too. Using the same variable which is the same as inbuilt function is not encouraged and lead to inappropriate conditions as such.

So, update this loop here and this should solve:

for i=na:-1:1
    sumOut=0; % Replace sum with other variable
    X(i)=0;
    for j=1:na
        sumOut=sumOut+A(i,j)*X(j);
    end
    X(i)=(B(i)-sumOut)/A(i,i);
end

Hope this helps.

Regards,

Sriram

MATLAB: Sum

I am a little confused, do you mean like this:

Y = reshape(1:18,6,3)  % A manageable dimension.
Y_1 = sum(Y,2)

So in your case it would be

Y_1 = sum(Y,2).';

Or do you mean, more like this:

Y = 1:18
Y_1 = sum(reshape(Y,3,6))

So in your case it would be

Y_1 = sum(reshape(Y,320,467))

Best Answer

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MATLAB: How to sum the matrix element

MATLAB: Sum

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