Error using _*_. What am I doing wrong?

Question

Atli Tobiasson 2021-2-19

评论： Alan Stevens 2021-2-19

t = linspace(t1,10,200);
x(t) = ((F0*exp((-zeta*omega*t.)))/(k*sqrt(1-zeta^2)))*((exp(zeta*omega*t1)*cos(omega*(t.-t1))-phi)-cos(omega*t.-phi));

First I got this error

Error using *

Incorrect dimensions for matrix multiplication. Check that the number of columns in the first matrix

matches the number of rows in the second matrix. To perform elementwise multiplication, use '.*'.

Then I added '.*' after every 't' and now I get the following error. Where am I getting this wrong?

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

for mismatched delimiters.

Stephen23 2021-2-19

If you are not doing linear algebra then you should not be using matrix operations:

Use array operations.

Atli Tobiasson 2021-2-19

thanks!

Answer 1

Alan Stevens 2021-2-19

You need dots before the * and before the / , not after the t.

Atli Tobiasson 2021-2-19

Thank you. I fixed it and also changed x(t) -> x, which gave me an error too

Alan Stevens 2021-2-19

You will need to post your full code for anyone to be able to resolve your further error.