Undefined function 'times' for input arguments of type 'cell'.

clear; clc;
syms F m w0 w

F=1.0;
m=1.0;
w0=1.0;
w=0.9;

t=0:40*pi;
y={(2*F)/(m*((w0)^2-w^2))}.*sin(((w0)+w)/2.*t).*sin(((w0)-w)/2*t);

plot(t,y)

I tried to plot this equation, but it said Undefined function 'times' for input arguments of type 'cell'. and i don't know what's wrong with it. what should i do for ploting this equation?

Answer 1

[Stephen23]

You created a cell array on this line by using the curly braces {}:

y={(2*F)/(m*((w0)^2-w^2))}.*...

If you just want to group the terms, then use standard parentheses ():

y = ((2*F)/(m*((w0)^2-w^2))) .* ...

although the rules of operator precedence show that this should work too:

y = (2*F) / (m*((w0)^2-w^2)) .* ...

Tip: too many brackets does not make code clearer, it makes it harder to read. Compare:

y = ((2*F)/(m*((w0)^2-w^2))) .* sin(((w0)+w)/2.*t).*sin(((w0)-w)/2*t);
y = (2*F) / (m*(w0^2-w^2)) .* sin((w0+w)/2.*t) .* sin((w0-w)/2*.t);