Option variable
listdummyvars
Default value: true
When listdummyvars
is false
, "dummy variables" in the
expression will not be included in the list returned by listofvars
.
(The meaning of "dummy variables" is as given in freeof
.
"Dummy variables" are mathematical things like the index of a sum or
product, the limit variable, and the definite integration variable.)
Example:
(%i1) listdummyvars: true$ (%i2) listofvars ('sum(f(i), i, 0, n)); (%o2) [i, n] (%i3) listdummyvars: false$ (%i4) listofvars ('sum(f(i), i, 0, n)); (%o4) [n]