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Re: Import polynomial from file and define function from
*To*: mathgroup at smc.vnet.net
*Subject*: [mg112157] Re: Import polynomial from file and define function from
*From*: Bob Hanlon <hanlonr at cox.net>
*Date*: Thu, 2 Sep 2010 02:32:48 -0400 (EDT)
*Reply-to*: hanlonr at cox.net
Use Set rather than SetDelayed
F[q_, x_] = poly;
Bob Hanlon
---- nick_twisp <niels.kurz at googlemail.com> wrote:
=============
Hello Mathematica community,
I am looking for a solution of the following problem:
I have some quite long polynomial in q and x stored in a file and
with
test = Import["this_file_containing_the_polynomial"];
I import the string and with
poly = ToExpression[test];
I convert it to an expression. If I usually would like to define a
function (like in this case in x and q) from it, I would write
F[q_, x_] := poly;
Unfortunately this doesn't work at all. Strange enough if I just paste
the huge expression behind F[q_, x_]:=, then it works and I have a
function in q and x, which is evaluated when I put a concrete number
e.g. for q (then becoming a polynomial in x).
Does someone have an idea, how I could define a function from an
expression?
Thanks in advance,
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