MATLAB: Error using * (Inner matrix dimensions must agree)

Question

This is what I have so far

if true
clear all; 
clc;
close all;
t=(-.5:1*exp(-6):2);
f=6*exp(-1.5*t)*cos(8*3.14*t);
F=input('Enter a particular value for f(t): ');
Figure 1;
Plot (f,t,'r',F,t,'g');
grid on;
hold on;
end

I know my problem is at the f= line, what am I doing wrong with the *? Thanks

Answer 1

doc times % or '.*'

will answer all...