Section: Function Related Functions
syms = symvar(expr)
where expr is a string containing an expression, such as
'x^2 + cos(t+alpha)'. The result is a cell array of strings
containing the non-function identifiers in the expression. Because
they are usually not used as identifiers in expressions, the strings
'pi','inf','nan','eps','i','j' are ignored.
--> symvar('x^2+sqrt(x)') % sqrt is eliminated as a function
ans =
['x']
--> symvar('pi+3') % No identifiers here
ans =
[]
--> symvar('x + t*alpha') % x, t and alpha
ans =
['alpha'] ['t'] ['x']
-->
quit