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

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Teb Keb
Teb Keb 2020-9-29
评论： Teb Keb 2020-9-29
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.

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James Tursa
James Tursa 2020-9-29
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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