# Revision history [back]

### How to make a list of polynomials callable?

A polynomial is callable:

sage: R=PolynomialRing(QQ,5,"x")
sage: R.gens()
(x0, x1, x2, x3, x4)
sage: f=x0*x1-x3
sage: f
x0*x1 - x3
sage: f(1,1,1)
0


but a list of polynomial is not:

sage: L=[x0*x1, x2, x3*x4]
sage: L(1,1,1,1,1)
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-38-7ed7fddd166b> in <module>
----> 1 L(Integer(1),Integer(1),Integer(1),Integer(1),Integer(1))

TypeError: 'list' object is not callable


Question: How to make a list of polynomials callable?

I would like a function MakeCallable as follows:

sage: def MakeCallable(L):
....:     ....
....:     return fL


where fL would be as follows:

sage: def fL(x0, x1, x2, x3, x4):
....:     return [x0*x1, x2, x3*x4]


### How to make a list of polynomials callable?

A polynomial is callable:

sage: R=PolynomialRing(QQ,5,"x")
sage: R.gens()
(x0, x1, x2, x3, x4)
sage: f=x0*x1-x3
sage: f
x0*x1 - x3
sage: f(1,1,1)
0


but a list of polynomial is not:

sage: L=[x0*x1, x2, x3*x4]
sage: L(1,1,1,1,1)
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-38-7ed7fddd166b> in <module>
----> 1 L(Integer(1),Integer(1),Integer(1),Integer(1),Integer(1))

TypeError: 'list' object is not callable


Question: How to make a list of polynomials callable?

I would like a function MakeCallable as follows:

sage: def MakeCallable(L):
....:     ....
....:     return fL


where fL would be as follows:follows (here L=[x0*x1, x2, x3*x4]):

sage: def fL(x0, x1, x2, x3, x4):
....:     return [x0*x1, x2, x3*x4]