finverse (Symbolic Math Toolbox)

Functional inverse

Syntax

```
g = finverse(f)
g = finverse(f,u)
```

Description

g = finverse(f) returns the functional inverse of f. f is a scalar sym representing a function of one symbolic variable, say x. Then g is a scalar sym that satisfies g(f(x)) = x. That is, finverse(f) returns , provided exists.

g = finverse(f,v) uses the symbolic variable v, where v is a sym, as the independent variable. Then g is a scalar sym that satisfies g(f(v)) = v. Use this form when f contains more than one symbolic variable.

Examples

finverse(1/tan(x)) returns

```
atan(1/x)
```

finverse(exp(u-2*v),u) returns

```
2*v+log(u)
```

See Also

compose, syms

findsym fortran