If the variable name in a fit command is given as "value('varname'), statement is not evaluated, and an error message
Singular matrix in Givens()
error during fit
appears, when the same variable name without the "value" statement works. more a feature than a bug, no doubt, but i guess it´s an easy fix anyway.
gp is official 4.6.0 windows build
fit a "-" via value("a")
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