Re: [Axiom-mail] How to convert a Polynomial Integer into String

[Themos Tsikas]

Hello


(1) -> df :=D(exp(x) + 2*x,x)

          x
   (1)  %e  + 2
                                                     Type: Expression Integer
(2) -> f1: TextFile := open("df.txt", "output")

   (2)  "df.txt"
                                                               Type: TextFile
(3) -> for i in tex(df::TexFormat)  repeat writeLine!(f1,i)
                                                                   Type: Void
(4) -> close! f1

   (4)  "df.txt"
                                                               Type: TextFile
On Saturday 24 May 2008, Shing Hing Man wrote:
> I am trying to write the following (tex expression of)
> variable df into a text file.
>
> (20) -> df :=D(exp(x) + 2*x,x);
> (20) ->
>
> Type: Expression Integer
> (21) -> df
> (21) ->
> $$
> {e \sp x}+2
> \leqno(21)
> $$
>
>
> Type: Expression Integer
>
>
> I could use the command File(Expression Integer) as
> described in
> section 9.24 of the Axiom book.
>
> Alternatively, I am trying to use the command TextFile
>
>
> f1: TextFile := open("df.txt", "output");
>
> writeLine!(f1,df);
>
> close! f1;
>
>
> But I get an error complaining  the second parameter
>  in writeLine!(*,*)
> should be of type String.
> How to convert df into a String ?
>
>
> Thanks advance for any assistance!
>
> I am using  version axiom-mar2008.
>
>
> Shin
>
> Home page : http://www.lombok.demon.co.uk/
>
>
>
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