Fill a nxm matrix with vectorised expression
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Hi all,
here my doubt: i have a matrix M with dimensions nxm. The matrix is initially initialised with zeros, and i fill each M(i,j) calling another function:
M = zeros(n,m)
for i = 1:n
for j = 1:m
M(i,j) = another_function(several_inputs);
end
end
is it possible to fill the matrix M without the for loops, but instead using a vectorised expression?
Thanks
4 个评论
Konstantin
2020-10-16
What is the condition for selecting the function? Is the function different for each cell of the matrix, or is it possible, that the same function will be used for several cells?
KSSV
2020-10-16
It depends on what your another_function is.
Andrea Agosti
2020-10-16
Konstantin
2020-10-16
sometimes it works to vectorize the function itself
matrix = another_function(matrix)
采纳的回答
No, there is no way to vectorize an element-wise function generically, without considering the specifics of the function. You can avoid for-loop syntax by using arrayfun, but this simply hides the loops from view, it doesn't replace them with something more efficient.
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