Why do I get that my variable is not defined? 2

[bojoka4052]

I am trying to make one variable "M_y", and not two seperate variable "M" and "y". I used the subscript function to get the "y" down, but it seems to tell me that "y" is not defined, when M_y is supposed to be one variable. I attached a picture which shows my problem.

 

[IFRs]

Because you are using the Matrix toolbox. Try typeing M.y:1

 

[IRstuff]

Mathcad has TWO types of subscripts, indices and literals

indices created using "[" are intended for live math calculations, where the index is incremented/decrement to address different elements of an array
literals created using "." as suggested by IFRs are intended solely as unique labels

The matrix toolbar's shortcut creates an index subscript, but you apparently want a literal subscript

TTFN (ta ta for now)
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