How to save vector from loop?

Hi,

i'm solving a cubic equation using roots command, i need only real solution not imaginary. I need to solve this equation for range of 1 to 150, and individual solutions save as a vector. I have a script that save only last solution. Could you please help me? Thanks a lot.

for v=0:150

x=roots([2*ro*A 0 2*ro*A*(2*v+v^2) -P]);

x = x(imag(x)==0);

end

Answer 1

[Star Strider]

The essence of what you have should probably work.

One change:

r{v+1} = x(imag(x)==0);

This saves ‘r’ as a cell array, allowing for differnet numbers of real roots in each iteration. That avoids problems with ‘x’ being both a vector and a cell array.