How to use Semilogy in MATLAB

Hello.

I want to make a graph with help of 'semilogy', the graph should display the Condition numbers grows with n.

This is my attempt so far:

for n=1:10, % loops from 1 to 10 n A=cond(n); % give us the Condition number A

semilogy(A) hold on end

grid on

When I debug my code, it results to no graph at all. I also thinking about to use 'norm', but perhaps it is already a part of the 'cond'?

Please, help me.

Regards Cillian

Answer 1

[Thomas]

try saving A as a vector and move the plotting outside.

for n=1:10, % loops from 1 to 10 n 
    A(n)=cond(n); % give us the Condition number A

end
semilogy(A) 

grid on

Answer 2

[Wayne King]

Why are you using semilogy in a for loop where you are only plotting a single value for A at a time?

Save the values of A in a vector.

A(n) =

then outside the for loop

   semilogy(n,A)