I have a program (enclosed) that will define an undefined variable which works fine on version 14 but in version 15 it tells me the variable "rLSL" is undefined and to get it to work, I must define it prior to calling this program which defeats the purpose of the program.
It shows the variable undefined prior to calling the program .
No, there is no way to "undefine" a variable in Mathcad (prior to Prime). You may undefine it for the symbolic processor via rLSL:=rLSL but there is no way to undefine a variable for the numeric processor.
Try to evaluate rLSL immediatly after the supposed undefinition before your routine - I bet it has a value and it will be already 0.
EDIT: Correction, there is a clumsy way to undefine a variable. You may undefine rLSL by assigning it an undefined variable, e.g.: rLSL:=xyz_123
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