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# simple matlab plot help

## simple matlab plot help

(OP)
Hi,
I want to plot two function
1. θ=tan^(-1)〖(ω*Q_P)/ω_P 〗-tan^(-1)〖(ω/(ω_p*Q_P ))/(1-〖(ω/ω_P )〗^2 )〗
Want to plot θ w.r.t ω/ω_p. I wrote the code

for Qp=1:1:5;
x= 0:0.4:2;
c=atand(x*Qp);
f=x*power(Qp,-1);
h=1-power(x,2);
j=f/h;
d=atand(j);
o=c-d;
plot(x,o),
grid on,
hold on,
end

So ω/ω_p=x will vary from 0 to 2 and θ=o. Will get 5 graph from different value of Qp (1 to 5)
The line "o=c-d" is not working. getting wrong plot. Is there anything wrong with the array? or what?

2. V_o/V_i =1/√(〖(1-(ω/ω_p )^2)〗^2+(〖ω/(ω_P*Q_P ))〗^2 )
Want to plot V_o/V_i w.r.t ω/ω_p. I wrote the code
for Qp=1:1:5;
x=0.5:0.01:1.5;
d=power((1-power(x,2)),2);
p=power((x*power(Qp,-1)),2);
y=1\sqrt(d+p);
% z=power(y,-1);
plot(x,z),
grid on,
hold on,
end

ω/ω_p=x will vary from 0.5 to 1.5. Will get 5 graph from different value of Qp (1 to 5)

V_o/V_i should be Y. But then the graph is not the proper one. If I inverse the graph Y ie Z then I am getting the proper graph.

**** can anyone help me in this regard?
Thanks
San

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