Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters.

t=linspace(0,1.5,100);

u1=1.75*cos(14.178*t);

u2=exp(-0.89*t)

u3=exp(-0.89*t)*(1.75*cos(14.178*t)

The first 2 expression of this is running my graph. However when I multiply them together as u3, it keeps saying it is invalid expression and might be missing a parenthesis at the end. I tried putting parenthesis at the end and even tried to get rid of the parenthesis, it still gives me error.

Answer 1

[James Tursa]

You are missing an ending parenthesis, and also you probably need to use element-wise multiply:

u3 = exp(-0.89*t) .* (1.75*cos(14.178*t));

[Teb Keb]

Thank you so much. It worked.