How do I store larger and smaller values in a matrix?

Hi!

I made a small code and found out that when making calculations in my matrix some values approximates to zero as a result of other large numbers. Is there some general way of managing this? Here's my code:

R  = 100;
C  = 10^-9;
R3 = 100;
R2 = ones(3,1).*R3.*sqrt(2)
R2(1) = 1    *R2(1); %Equal complex and real part
R2(2) = 0.95 *R2(2); %Larger complex than real part
R2(3) = 1.05 *R2(3); %Smaller complex than real part
R4 = 100;
R5 = 100;
G = R5/R4;
k = G/(R*C);

%Transfer fucntion numerator and denumerator
denum = ones(3,3);
for i = 1:3
    denum(i,:) = [1, k.*R2(i)./R3, k^2]
end

You will se that all rows in denum's first column will become 0 as k^2 is large. Even though the first column should have ones in it.

I know I can but in ones later on, but I have ones there for the simplicity of explaining the problem.

Answer 1

[OCDER]

I'm guessing this is what you see:

denum =
  1.0e+014 *
    0.0000    0.0000    1.0000
    0.0000    0.0000    1.0000
    0.0000    0.0000    1.0000

This is just the way matlab displays variables, but the value is still there. To see all the variables, use the format function like this:

>> format longeng
or
>> format shorteng

your denum values is now this (shorteng version):

denum =
   1.0000e+000   100.0000e-006   100.0000e+012
   1.0000e+000    13.4350e+006   100.0000e+012
   1.0000e+000    14.8492e+006   100.0000e+012

[Robin Hellmers]

Thank you very much!

[OCDER]

You're welcome!