On Saturday, July 15, 2017 at 1:21:50 AM UTC+2, Chris Seberino wrote:
>
> I've tried lots of variations of the following to replace a product of
> functions with y. They all give the error at the bottom in Sagecell. How
> fix?
>
> var("y")
> f = function("f")(x)
> g = function("g")(x)
> eqtn = f(x) * g(x) + 4*f(x)^2 * g(x) == 0
> eqtn = eqtn.substitute({f(x) * g(x) : y})
> show(eqtn)
>
> /home/sc_serv/sage/local/lib/python2.7/site-packages/IPython/core/interactiveshell.py:2881:
>
> 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=...)
> See http://trac.sagemath.org/5930 for details.
> exec(code_obj, self.user_global_ns, self.user_ns)
>
Just define
f = function("f")
g = function("g")
instead
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