![]() For example, if the index is the result of a calculation or is part of a loop, then you might need to adjust the calculation of the number of loop iterations. To fix this error, double-check that the matrix is the size you were expecting it to be and that the index you’re using is also what you expect. For example, if the matrix has N elements, and you try to index into the N 1 element: A = magic(5) ![]() Quite simply, this error arises when you try to reference an element that doesn’t exist. ![]() Note that even though this error message is the most common in this situation (since, well, multiplication is pretty popular) there are similar messages for the misuse of ^, /, and \ as opposed to. A.*Bįor more information about the different MATLAB operators, see Array vs. * instead of * to perform the elementwise multiplication, where corresponding elements are multiplied and the result is the same size as the inputs. Notice how those matrices have the common dimension “M”? That’s where this message comes from it’s a common inner dimension. The * operator performs matrix multiplication, where an NxM matrix is multiplied by an MxP matrix, resulting in an NxP matrix. The key to this error message is usually that people are not aware of the elementwise operators in MATLAB. Some example code that produces this message is: A = Įrror using * Inner matrix dimensions must agree. They create a few matrices or vectors and just go to multiply them with A*B, and this message is returned. Error using * Inner matrix dimensions must agree.īy far the most common error message I see posted about by new users is this one. Subscripted assignment dimension mismatch.ġ. 4. The expression to the left of the equals sign is not a valid target for an assignment.3. Subscript indices must either be real positive integers or logicals.1. Error using * Inner matrix dimensions must agree.
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