MATLAB: Sum of an arrays elements

MATLABmatrix arrays

I have an assigntment which sounds like this:

square each element in C and determine the sum of all C's elements

How do i do this? I don't get the right result, that i am supposed to get.

Best Answer

I'd assume

 C   = [1 2 3];
 res = sum(C.^2)

What is the input, what is the expected result?

Related Solutions

MATLAB: How to perform tensor summation without using “for” loop

A = [1 2 3 4; 5 6 7 8; 9 10 11 12];
rows = num2cell(A, 2);  %split A, keeping columns together
[rows{:}] = ndgrid(rows{:});  %calculate cartesian product of all the rows
result = reshape(sum(cat(numel(rows) + 1, rows{:}), numel(rows) + 1), [], size(A, 2))'  %sum the cartesian product and reshape into desired output format

Note that the above iterates over the elements of row1, then row2, ... then rown. If you want the reverse, then change the second line to:

[rows{:}] = ndgrid(rows{end:-1:1});

Your example is ambiguous in that respect.

MATLAB: Find row and column of a value in cell array

C = {[11],[43;54;63;64],[87;97;108]};
A = rand(10);
result = cellfun(@(x) {ind2sub2(size(A), x)}, C);
function y = ind2sub2(sz, ind)
    [r,c] = ind2sub(sz, ind);
    y = [r(:) c(:)];
end

Result:

>> result{1}
ans =
     1     2
>> result{2}
ans =
     3     5
     4     6
     3     7
     4     7
>> result{3}
ans =
     7     9
     7    10
     8    11

Best Answer

Related Solutions

MATLAB: How to perform tensor summation without using “for” loop

MATLAB: Find row and column of a value in cell array

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