MATLAB: What does ./ mean in matlab

operators

I am porting code from Matlab to Java. And being entirely unfamiliar with Matlab I am not sure what this "./" operator means in Matlab. Found in this function generated in matlab neural network code.

if true
%code
% Sigmoid Symmetric Transfer Function
function a = tansig_apply(n)
a = 2 ./ (1 + exp(-2*n)) - 1;
end
end

Best Answer

look at redivide().

From MATLAB HELP: x = A./B divides each element of A by the corresponding element of B. Inputs A and B must have the same size unless one is a scalar value. A scalar value is expanded into an array of the same size as the other input.

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The sum function in Fortran sums all of the elements in the array. The / operation in Fortran is an element-wise divide. I.e., for arrays X and Y of the same size

Fortran   Equivalent MATLAB
-------   -----------------
sum(X)    sum(X(:))
X / Y     X ./ Y
X * Y     X .* Y

The X(:) simply returns X reshaped into a column vector. So in your case, if you wanted it all on one line, the equivalent code would be:

Fortran                                   Equivalent MATLAB
-------                                   -----------------
sum(A(:,:,:,:,:,1))/sum(A(:,:,:,:,:,2))   sum(reshape(A(:,:,:,:,:,1),[],1))./sum(reshape(A(:,:,:,:,:,2),[],1))

Note: The result of the sums on the MATLAB code are scalars, so I could have used / instead of ./

Best Answer

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