# Undefined function or variable

3 views (last 30 days)
Madara Hettigama on 6 Nov 2019
t=1;
R1=1;
R0=10;
w=(0.001:0.001:1000)
log10w=log10(w)
a1=0.25;
a2=0.5;
a3=0.75;
a4=1;
c1=cos((a1*pi)/2);
s1=sin((a1*pi)/2);
ModZ1=sqrt((R1^2.*(w*t)).^2*a1+2*c1*R0*R1.*(w*t).^a1+R0^2)./(1+2*c1.*(w*t).^a1+(w*t).^2*a1);
c2=cos((a2*pi)/2);
s2=sin((a2*pi)/2);
ModZ2=sqrt((R1^2.*(w*t)).^2*a2+2*c1*R0*R1.*(w*t).^a2+R0^2)./(1+2*c1.*(w*t).^a2+(w*t).^2*a2);
c3=cos((a3*pi)/2);
s3=sin((a3*pi)/2);
ModZ3=sqrt((R1^2.*(w*t)).^2*a3+2*c1*R0*R1.*(w*t).^a3+R0^2)./(1+2*c1.*(w*t).^a3+(w*t).^2*a3);
c4=cos((a4*pi)/2);
s4=sin((a4*pi)/2);
ModZ4=sqrt((R1^2.*(w*t)).^2*a4+2*c1*R0*R1.*(w*t).^a4+R0^2)./(1+2*c1.*(w*t).^a4+(w*t).^2*a4);
plot(log10w,ModZ1,'k')
hold on
plot(log10w,ModZ2,'y');
plot(log10w,ModZ3,'b');
plot(log10w,ModZ4,'m');
xlabel('log10w');
ylabel('|Z|')
When I press run it says "undefined function of variable "modulus" ?
Walter Roberson on 6 Nov 2019
I do not encounter any difficulty in running that code. Other than the fact that you really really should put a semi-colon on the end of the assignments to w and log10w because your vectors are quite long.

Jeremy on 6 Nov 2019
Your script runs for me as-is
Madara Hettigama on 7 Nov 2019
It's fine now I think- I clicked run section and graph came up, thank you.