On Wed, Nov 2, 2011 at 12:08 PM, Laurent <moky.m...@gmail.com> wrote:
> In order to anticipate the next question, if you are wotking in a script
> instead of
> the terminal.
>
> The code
>
> f(x,y)=x*y
> print f(5,4)
>
> raises
> SyntaxError: can't assign to function call
>
>
> The code
> x,y=var('x,y')
> f=x*y
> print f(4,3)
>
> raises
> DeprecationWarning: Substitution using function-call syntax and unnamed
> arguments is deprecated and will be removed from a future release of Sage;
> you can use named arguments instead, like EXPR(x=..., y=...)
>
> I know two "correct" ways to do that :
>
> x,y=var('x,y')
> f=x*y
> print f(x=4,y=3)
>
> or
>
> x,y=var('x,y')
> f=symbolic_expression(x*y).function(x,y)
> print f(x,y)
>
> Remark that
>
> f=symbolic_expression(x*cos(y)).function(x,y)
> print f(0,1) # 0
> g=symbolic_expression(x*cos(y)).function(y,x)
> print g(0,1) # 1!!
>
> Hope it helps in any way
>
> Laurent
>
>
>
> --
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Hi,
I think its a issue of parsing. If your file is called hello.py it
gives the errors you mentioned. However if you call your file
hello.sage it works. If you call your file hello.sage and run
sage hello.sage
it generates a hello.py which I append below -
# This file was *autogenerated* from the file temp.sage.
from sage.all_cmdline import * # import sage library
_sage_const_5 = Integer(5); _sage_const_4 = Integer(4)
var('x,y')
__tmp__=var("x,y"); f = symbolic_expression(x*y).function(x,y)
print f(_sage_const_5 ,_sage_const_4 )
I think you can now figure out how it is working. Hope it helps.
Rajeev
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