Finding the matrix with the most elements?

Hello all,

I'm kinda new to matlab so I'm still trying find my way through the way things work. That said I have a question that I need some help on:

I have 3 matrix arrays of varying sizes, called say V1, V2, and V3. How would I go about programming the code so that matlab finds the matrix with the most elements.

I want to save the number of elements in the largest matrix as it's own variable, "LarMat", and I know how to do that already, it's just that finding the largest of the three is giving me some trouble.

[Azzi Abdelmalek]

V1=[1 2;3 4]
V2=[0 1 2;3 4 1]
V3=[5 6 0 1;2 3 0 1;1 1 0 1]

What would be the result?

Answer 1

[Star Strider]

This is one way:

V1 = rand(2,2);
V2 = rand(3,3);
V3 = rand(4,4);

[els,idx] = max([numel(V1) numel(V2) numel(V3)]);

The ‘els’ variable will tell you the maximum number of elements, and the ‘idx’ variable will tell you which one. (It is ‘V3’ — the third matrix whose elements are determined — here.)

[Andrew]

Your answer was simple and straightforward, my program string works well now, thank you for you help.

[Star Strider]

My pleasure!

Thank you for the compliment.

[Image Analyst]

Andrew, what was the method you were using to find "LarMat"?

Answer 2

[Image Analyst]

Try this:

% Check the number of elements against LarMat, 
% which you say that you've computed already (or at least know how to).
if LarMat == numel(V1)
    fprintf('V1 is the largest.\n');
elseif LarMat == numel(V2)
    fprintf('V2 is the largest.\n');
else
    fprintf('V3 is the largest.\n');
end

Answer 3

[Chad Greene]

V1 = rand(1,5); 
V2 = rand(4,3);
V3 = magic(2); 

% Number of elements in each matrix: 
numels = [numel(V1) numel(V2) numel(V3)];

% Max number of elements per matrix: 
LarMat = max(numels)

% Matrix with most elements:
BiggestMatrix = find(numels==LarMat)