Error: Unexpected MATLAB expression.

2017 10 26
2 个回答
回答已采纳
更新时间：2017 10 27
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0 个投票

I simply do not understand how there is an error here,
>> f = symsum((1/(2*n-1))*sin((2*n-1)2*x), n, 1, 5)
↑ Error: Unexpected MATLAB expression.
To clarify the arrow is pointing at the "2" next to "x".
Edit: I have defined x and n as symbolic, but the error still occurs.

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 采纳的回答

Birdman
Birdman 2017-10-26
编辑：Birdman 2017-10-26

1 个投票

You have not defined n and x as symbolic.
syms n x
f = symsum((1/(2*n-1))*sin((2*n-1)*2*x), n, 1, 5)

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Ian Bathgate
Ian Bathgate 2017-10-26
The error still occurs
Birdman
Birdman 2017-10-26
I edited the equation. There was a operator missing. Now check the answer.
Ian Bathgate
Ian Bathgate 2017-10-26
Thank you so much, I sat there looking at it for nearly 20 minutes. thanks.

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更多回答（1 个）

Jan
Jan 2017-10-26
编辑：Jan 2017-10-26

3 个投票

"(2*n-1)2*x" is no valid Matlab expression, because the operator after ")" is missing. I guess:
f = symsum((1/(2*n-1))*sin((2*n-1) * 2*x), n, 1, 5)
% ^ inserted

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Jan
Jan 2017-10-27
:-) This was a duplicate answer given in the same minute.

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