`hasSymType`

Tests whether an expression contains a subexpression of a given symbolic type.

Category: Symbolic Computations in MATLAB > Symbolic Variables, Expressions, Functions, and Preferences

Syntax

tf = hasSymType(S, type)

Returns true if any subexpression of S has the type type.

Description

The search covers the entire expression tree. That is why hasSymType(x^2, 'integer') is true: the exponent 2 is an integer subexpression, even though the expression as a whole is not an integer.

It is the yes-or-no counterpart of findSymType, and unlike isSymType it looks inside the expression rather than at its top level.

Input arguments

S: Symbolic expression.
type: Type name string, such as 'variable', 'integer' or a function name like 'sin'.

Output arguments

tf: Logical scalar.

Example

Searching by type

syms x
hasSymType(x^2, 'variable')
hasSymType(x^2, 'integer')
hasSymType(x^2, 'sin')
hasSymType(sin(x) + 1, 'sin')

Output

ans = logical
   1
ans = logical
   1
ans = logical
   0
ans = logical
   1

hasSymType