MATLAB Function Reference

symvar

Determine the symbolic variables in an expression

Syntax

• symvar 'expr'
  s = symvar('expr')
  

Description

symvar 'expr' searches the expression, expr, for identifiers other than i, j, pi, inf, nan, eps, and common functions. symvar displays those variables that it finds or, if no such variable exists, displays an empty cell array, {}.

s = symvar('expr') returns the variables in a cell array of strings, s. If no such variable exists, s is an empty cell array.

Examples

symvar finds variables beta1 and x, but skips pi and the cos function.

• symvar 'cos(pi*x - beta1)'
  
  ans = 
  
      'beta1'
      'x'
  

See Also

findstr

symrcm

system

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