CODEWITHSUNDEEP
matlabmatrix
idol2k
idol2k

Reputation: 5

Augmenting matrix rows iteratively with answers

I am trying to add a row to a matrix every time an iterative loop in MATLAB produces an answer from fsolve function.

Say, fsolve produces an answer 3 and 2 (2 elements), and then I want to add these into a 1x2 matrix.

After a second loop fsolve produces an answer 5 and 3 (2 new elements) and I want to add these to the old solution matrix but as a new row so that a new matrix is a 2x2 matrix.

and on and on.

any ideas?

Upvotes: 0

Views: 134

Answers (2)

Scott
Scott

Reputation: 99

You can also use end to add an extra column to your matrix, so A(:,end+1) = [x1; x2]; adds an extra column to the matrix A. This also works for rows of course.

Upvotes: 1

lakshmen
lakshmen

Reputation: 29064

To augment:

Before the loop:

A = [];

In the loop, for example:

A = [A; 3 2];

A better way is to pre-allocate the array given you know how many times you gonna run the loop.

For example,

A = zeros(n,2);
A(i,:) = [3 2];

Upvotes: 1

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