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

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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.

Accepted Answer

James Tursa
James Tursa on 29 Sep 2020
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));

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