emptying each row of matrix of a in a loop then uses respective matrices produced from it to get a certain value

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JL
JL 2019-8-22
评论： JL 2019-8-27
I have a matrix, a
a = [1 2;
1 3;
1 5;
1 7;
1 8;];
and this matrix a, is emptied in each row per loop until the last one using this code from Matt J
a0=a;
for i=1:size(a,1)
a=a0;
a(i,:)=[],
end
which result in:
a = [1 3;
1 5;
1 7;
1 8;];
a = [1 2;
1 5;
1 7;
1 8;];
a = [1 2;
1 3;
1 7;
1 8;];
a = [1 2;
1 3;
1 5;
1 8;];
a = [1 2;
1 3;
1 5;
1 7;];
can I create another loop to calculate a certain value, w, from the results from each loop beginning with the orginal until the last one. After each loop answer value, w, is tabulated in matrix b
b = [w
w
w
w
w
w]
there 6 values of w since we consider the orginal a
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JL
JL 2019-8-22
for i=1:size(a,1)
a=a0;
a(i,:)=[],
% work with matrix a here
end
This code actually works but it doesnt save the values from this loop into another matrix

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Matt J
Matt J 2019-8-22
编辑：Matt J 2019-8-22
Why not as follows,
b=nan(size(a,1),1); %pre-allocate
for i=1:size(a,1)
tmp=a;
tmp(i,:)=[],
b(i)=max(tmp(:))-min(tmp(:)); %example derived quantity
end
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David Hill
David Hill 2019-8-22
best to pre-allowcate as Matt discribed. you could b=[]; outside loop and b=[b,w];inside loop. Matt's solution works best.

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