error Conversion to logical from sym is not possible.

i dont know how to solve that error

here is my code

clc;

clear all;

syms k ;

wo= input('write omega node = ');

% 100;

Mm=input('write motorcycle mass = ');

% 200;

Md=input('write diver mass = ');

% 80;

m=Mm+Md;

cp=input('write Cp = ');

% 0.1;

z=input('write zeita = ');

% 0.6;

i=0;

yo=input('wirte y node value = ');

for M=Mm+40:1:m

i=i+1;

f=((sqrt((k*yo)^2+(2*M*z*sqrt(k/M)*wo*yo)^2)/k)...

*(1/sqrt((1-(wo/sqrt(k/M))^2)^2+(2*z*(wo/sqrt(k/M)))^2)))-cp;

K(:,i)=vpa(solve(f));

r=wo/sqrt(k/m);

end

r=wo/sqrt(k/m);

if r>=1

return

end

C=2*m*z*sqrt(K/m);

M=Mm+40:1:m;

figure(1)

plot(M,K);

figure(2)

plot(M,C);

Answer 1

[Cris LaPierre]

The issue is with this line of code

if r>=1

Your variable r is a symbolic expression made up of symbolic variables. Therefore, this comparison can't be performed.

You would need to use subs to replace your symbolic variables with values, then use double to convert the symbolic variable to a double.