Hello
I would like to define a constant function in a script.
I have the following in the terminal :
=====================================================
19:43:28 ~ >$ sage
----------------------------------------------------------------------
| Sage Version 4.0, Release Date: 2009-05-29 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
sage: var('x')
x
sage: f(x)= 8
sage: print f.derivative()
x |--> 0
sage: type(f)
<type 'sage.symbolic.expression.Expression'>
=====================================================
That seems quite good.
But the following produce the error
SyntaxError: can't assign to function call
=====================================
#! /usr/bin/sage -python
# -*- coding: utf8 -*-
from sage.all import *
var('x')
f(x)= 8
print f.derivative()
===============================
If I write f=8 instead of f(x)=8, I gat the following :
File "./sagess.py", line 8, in <module>
print f.derivative()
AttributeError: 'int' object has no attribute 'derivative'
The difference between the same lines in the terminal and in a very
simple script seems strange to me.
I'm using the workaround :
var('x')
f = 8+x-x
But ... hum ... seriously ?
;)
Any better idea ?
Thanks a lot
Laurent
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