location of the i'th element

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victor hanna
victor hanna 2019-12-10
评论： JESUS DAVID ARIZA ROYETH 2019-12-10
hi
A is a matrix
Iam using a for loop on all the elements in A like this
n = numel(A);
for i = 1 : n
A(i);
end
but i need the element location in the original matrix
so my quastion is there away to find the i'th elements location in A ?
or if there is another way to run loop on all the elements?
  2 个评论
Stephen23
Stephen23 2019-12-10
"i need the element location in the original matrix"
And you have got it already: i is its linear index.
"is there away to find the i'th elements location in A"
The linear index of the i-th element of A is i.
Adam
Adam 2019-12-10
What do you mean by 'location'? i is its location as a 1d index.
You can use
doc ind2sub
to convert to 2d subscripts if you want, or just do the double loop around both dimensions. Or preferably don't do a loop at all, but that would depend entirely what you are actually doing in the loop body.

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JESUS DAVID ARIZA ROYETH
编辑：JESUS DAVID ARIZA ROYETH 2019-12-10
you can use nested loops
for i = 1 : size(A,1)
for j=1:size(A,2)
A(i,j)
end
end
with a loop:
n = numel(A);
for i = 1 : n
[row,col]=ind2sub(size(A),i);
A(row,col)
end
  2 个评论
victor hanna
victor hanna 2019-12-10
thanks
i wonder if there is away using one for
JESUS DAVID ARIZA ROYETH
JESUS DAVID ARIZA ROYETH 2019-12-10
n = numel(A);
for i = 1 : n
[row,col]=ind2sub(size(A),i);
A(row,col)
end

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