Find symbolic variables in symbolic input
symvar(
returns a vector of all symbolic
variables in s
)s
. The variables are in alphabetical order with uppercase
letters preceding lowercase letters.
symvar
treats the constants pi
, i
,
and j
as variables.
If there are no symbolic variables in s
, symvar
returns
the empty vector.
When symvar
sorts the symbolic variables alphabetically, all uppercase
letters have precedence over lowercase: 0 1 ... 9 A
B ... Z a b ... z.