Hi,
Could someone explain why I can't vectorize method 2 in the attached work sheet? It returns error message "this value must be a vector". The output of both functions being multiplied seem to be vectors, so I don't understand why I can't use the vectorize function to do an element per element multiplication.
Thank you,
Your function a2 was already written with vectors in mind. Its assumes that e.g. EL1 ist a vector. When you call M3 this fuction calls a2 vectorized which means that its first argument EL.1 (and the others as well) is a scalar, not a vector and therefore "last(EL.1)" finally throws the error because the function "last" needs a vector as its argument.
Basically you should write every function so that it works just with scalars and then just later use vectorization when you call them with vector arguments.
So you function a2 may simply look that way:
and so your function M3 works as expected
P.S.: You can use the "Error Tracing" facility on the "Calculation" Ribbon to find out where the error actually stems from
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