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concatenate a vector in column-major order

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OLUBUKOLA ogunsola
关闭： MATLAB Answer Bot 2021-8-20
I am trying to solve a problem where the elements of a vector is compared to something and if found true the location of the element (say(1,2)) is output into another vector in a column-major order . my problem is that the vector returns the location of the last element, it overrides the elements before it instead of concatenating it. e,g if the locations of the elements are (1,2) (3,2) (4,1). it returns only (4,1). how do I make it to concatenate and how do I set it to column-major order?
  1 个评论
Azzi Abdelmalek
Azzi Abdelmalek 2016-6-2
Your question is not clear, post your code, you can also, illustrate with an example

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回答（2 个）

OLUBUKOLA ogunsola
indexes=[]; for ii= 1:size (X,1); for jj = 1: size (X , 2); if X(ii , jj)< ii*jj; indexes = {ii ,jj}; end end end
Jos (10584)
Jos (10584) 2016-6-2
X = randi(20,6,4)
[ii,jj] = ndgrid(1:size(X,1), 1:size(X,2))
tf = X < ii.*jj
ii(tf)
jj(tf)
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OLUBUKOLA ogunsola
OLUBUKOLA ogunsola 2016-6-4
im pasting the code again because it was jumbled together
function indexes = small_elements ( X)
indexes=[];
for ii= 1:size (X,1);
for jj = 1: size (X , 2);
if X(ii , jj)< ii*jj;
a=[ii jj];
indexes=[indexes; a];
end
end
end
Jos (10584)
Jos (10584) 2016-6-4
Without an input, how can we know your code is incorrect?

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