Ruqayya

Getting an Error using ==> mtimes Inner matrix dimensions must agree.
Below is my code:
t0=0.1;
ts=0.0001;
fs=1/ts;
t= [0:ts:t0-ts]
m=sinc(100*t);
fc=250;
c=cos(2*3.14*fc*t);
u=m*c;