creating matrix with iteration

Question

Akmyrat 2014-8-5

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评论： Akmyrat 2014-8-9

lets say I have this code: for i=1:4 sum=1+i end i want program to create a ix2 matrix (1st column values are 3) at each iteration. ex: at i=3 => A=[2 3;3 3;3 4] at i=4 => A=[2 3;3 3;3 4;3 5]

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Answer 1

Hikaru 2014-8-5

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Try this code, but you have to specify n for the number of rows.

A = zeros(n,2);
A(:,1) = 3;
for i=1:n
    A(i,2) =1+i;
end

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Akmyrat 2014-8-5

thanks a lot Hikaru

Akmyrat 2014-8-9

Hi Hikaru how are You? Can U help with this PLEASE: n=4 for i=1:n s=i if s == 3 for k =1:2 A(i,1) =s A(s+1,1)=s end else A(i,1) =s end end I want like this result: A=[1;2;3;3;4]. which if s == 3 it should be repeated 3 times in the matrix.

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Answer 2

Julia 2014-8-5

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A = zeros(i,2);
A(:,1) = 3;
A(:,2) = 2:sum;

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Akmyrat 2014-8-9

Hi Julia how are You? Can U help with this PLEASE: n=4 for i=1:n s=i if s == 3 for k =1:2 A(i,1) =s A(s+1,1)=s end else A(i,1) =s end end I want like this result: A=[1;2;3;3;4]. which if s == 3 it should be repeated 3 times in the matrix.

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