Help me with the code

[roshan2]

Actually i am doing a matlab code to plot a graph.the dispersion graph.Beta - x axis and Frequency- Y axis

i want to extend the X axis to the negative side ie.want negative values in the x axis.

my code which showed result in the positive axis is as follows:

beta=0:2;
w=1:5;
p=6.9;
wL=3.03;
wR=1.6;
wsh=2.2;
wse=2.2;
for i=1:5
beta(i)=acos(1-1/2*(wL^2/w(i)^2+w(i)^2/wR^2-wsh^2/wR^2-wse^2/wR^2));
beta=beta*1/p;
end
plot(beta,w)


please respond

 

[navarro_itd]

Hi

If you want to extend to the negative axis, you need to begin the count in the cycle from a negative value, i.e. w=-5:5.

But, I think a negative frequency doesn't have physical meaning. Instead, try to plot real and imaginary for beta.