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Matlab gives error on empty line

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BBB
BBB on 13 May 2021
Commented: Tushal Desai on 14 May 2021
Hi! I was writing a code for an exercise but i was keep getting the same error on the same line as
"Error using ^ (line 51)
Incorrect dimensions for raising a matrix to a power. Check that the matrix is square and the power is a scalar. To perform
elementwise matrix powers, use '.^'."
i dont even have "^" symbol on that line and i delete the whole line even though it gives the same error and when i click "line 51" it opens a new window called mpower and shows 51th line which again with no "^" symbol.
Can you help me with this?
  1 Comment
Rik
Rik on 14 May 2021
Most symbols in Matlab will call a function internally: + will call plus, - will call minus, etc. So when you see ^, that will call mpower. Because most people will use ^ instead of directly calling mpower, the error message contains the symbol instead.
Walter already answered your question. If it solved your issue, you should accept his answer. If not, feel free to post follow-up questions in a comment to either this question, or his answer.

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Answers (1)

Walter Roberson
Walter Roberson on 13 May 2021
The important part is Untitled line 43, which is the assignment to K_fc .
On that line you have three places where you have expressions ^2 . At least one of the expressions is resulting in something that is not a square matrix. For example eta might be a row vector. When you want to square a vector you need to use .^ instead of ^
If you are working with vectors, then chances are high that you need to be using ./ instead of / . You might well also be needing to use .* instead of * on the line.
  7 Comments
Tushal Desai
Tushal Desai on 14 May 2021
Thank you for confirming and sorry for the inconvenience.

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