Symbolic Math Toolbox

subexpr

Rewrite a symbolic expression in terms of common subexpressions

Syntax

• [Y,SIGMA] = subexpr(X,SIGMA)
  [Y,SIGMA] = subexpr(X,'SIGMA')
  

Description

[Y,SIGMA] = subexpr(X,SIGMA) or [Y,SIGMA] = subexpr(X,'SIGMA') rewrites the symbolic expression X in terms of its common subexpressions. These are the subexpressions that are written as %1, %2, etc. by pretty(S).

Examples

The statements

• t = solve('a*x^3+b*x^2+c*x+d = 0');
  [r,s] = subexpr(t,'s');
  
  

return the rewritten expression for t in r in terms of a common subexpression, which is returned in s.

See Also

pretty, simple, subs

solve

subs