Scilab Home page | Wiki | Bug tracker | Forge | Mailing list archives | ATOMS | File exchange
Please login or create an account
Change language to: Français - Português - 日本語 - Русский

Please note that the recommended version of Scilab is 6.0.2. This page might be outdated.
See the recommended documentation of this function

Scilab Help >> Polynomials > varn

# varn

symbolic variable of a polynomial or a rational

### Calling Sequence

```[symb]=varn(p)
[pm]=varn(p,varname)```

### Arguments

p

matrix of polynomials or of rationals

symb

character string: name of the variable

varname

character string: the new name of the variable of `p`, set for `pm`

pm

matrix of polynomials or of rationals

### Description

`symb=varn(p)` returns in `symb` the symbolic variable of the polynomial `p` (i.e. `varn(poly(0,'x'))` is `'x'`).

`varn(p,'s')` returns a polynomial matrix with same coefficients as `p` but with `'s'` as symbolic variable (change of variable name).

### Examples

```s = poly(0,'s'); p = [s^2+1,s];
varn(p)
varn(p,'x')

f = %z / (%z-1); f = [f f^2]
varn(f)
varn(f,"x")```

### See Also

• poly — polynomial definition
• rlist — Scilab rational fraction function definition
• horner — polynomial/rational evaluation

### History

 Version Description 5.5.1 Extension to rationals

### Comments

Add a comment:
Please login to comment this page.

 Report an issue << systmat Polynomials Signal Processing >>

 Scilab EnterprisesCopyright (c) 2011-2017 (Scilab Enterprises)Copyright (c) 1989-2012 (INRIA)Copyright (c) 1989-2007 (ENPC)with contributors Last updated:Wed Apr 01 10:13:54 CEST 2015