Problem with writing this function

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Hanna Sundling
Hanna Sundling 2019-10-9
评论： Jon 2019-10-9
I do not understand what is wrong with this function. When I try to run the function written like this the error down below comes up.
y = (x.-1)/((x.^2).+x)

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采纳的回答

Jon
Jon 2019-10-9
编辑：Jon 2019-10-9
You may have some other issues also, but assuming that you have defined x as a column or row vector and you are expecting to calculate y for each element of x you should use something like
y = (x -1)./(x.^2 + x)
Note that the . operator is needed to get element by element division as in ./ and element by element exponentiation as in x.^2
The . operator is not needed and in fact is not a recognized operation for addition and subtraction which is always performed element by element in MATLAB

更多回答（1 个）

Vikas Kumar
Vikas Kumar 2019-10-9
Agree with Jon. I think you are getting error because of . operator you use with the addition and subtraction. This . operator is only meaningful when you want to do element by element operation, which in case of addition and subtraction is by default.
So:
y = (x-1)./((x.^2)+x)
  1 个评论
Jon
Jon 2019-10-9
Note also that parenthesis around exponentiation are not necessary either. They do not cause an error, but make the expression harder to read.

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