e.g.
q : String := quote()$CHAR
write!(f2, q)
Am 27.01.18 um 10:51 schrieb 'Nasser M. Abbasi' via FriCAS - computer
algebra system:
> How does one write a single " to a text file in Fricas?
>
> I need to write a string to a text file, but also keep the " " around
> the string and
> not have those removed when the string is written. This is because
> later when
> I read the file using another program, I need to have those "" there
> so I can
> read it as string.
>
> Here is an example
>
> -------------------------
> f2: TextFile := open("/tmp/foo.txt", "output")
> ii:=integrate(1/(a^2+b^2*x^2), x)
> -------------------------
>
> Now I want to write variable ii to the file as string. We see it is
> string when
> doing this
>
> unparse(ii::InputForm)
> (45) "atan((b*x)/a)/(a*b)"
> Type:
> String
>
> So I did this
>
> ----------------------
> (46) -> writeLine!(f2, unparse(ii::InputForm) )
> close!(f2)
> ----------------------
>
> But when I look at the file, the string quotes that show up on the
> screen " "
> are missing at the start and at the end in the file
>
> atan((b*x)/a)/(a*b)
>
> So the way I do this in Maple for example, is to add explicit " at end and
> at start. But I do not know how to tell fricas to write a single ". I
> do not
> know how to escape the "
>
> I tried
>
> writeLine!(f2, concat("\"", unparse(ii::InputForm), "\"") )
>
> And tried
>
> write!(f2, "\"")
> write!(f2, unparse(ii::InputForm))
> write!(f2, "\"")
> writeLine!(f2)
>
> But the problem is, I do not know how to write a single " to the file.
>
> Thanks
> --Nasser
>
>
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--
Mit freundlichen Grüßen
Johannes Grabmeier
Fraktionsvorsitzender
FREIE WÄHLER, Stadtrat Deggendorf
Prof. Dr. Johannes Grabmeier
Köckstraße 1, D-94469 Deggendorf
Tel. +49-(0)-991-2979584, Tel. +49-(0)-151-681-70756
Fax: +49-(0)-322-241-92688
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