Re: [Reduce-algebra-developers] "read" command?

[Kostas O. <k.o...@at...>]

Thanks Raf and Eberhard, I think that will take care of my immediate
problem.  But the solution is certainly non-trivial!

maxima has this command:





------------------------------------------------------------------------





_Function:_ *read*/(expr_1, …, expr_n)/

    Prints expr_1, …, expr_n, then reads one expression from the console
    and returns the evaluated expression. The expression is terminated
    with a semicolon |;| or dollar sign |$|.

    See also |readonly <cid:par...@at...>|

    Example:

    (%i1) foo: 42$ 
    (%i2) foo: read ("foo is", foo, " -- enter new value.")$
    foo is 42  -- enter new value. 
    (a+b)^3;
    (%i3) foo;
                                         3
    (%o3)                         (b + a)

    Categories:  Console interaction <cid:par...@at...>

------------------------------------------------------------------------

I think a similar command would be generally useful in Reduce.

                            Kostas


On 11/13/2014 15:14, Eberhard Schruefer wrote:
> One possibility would be
>
> symbolic procedure ask_value u;
>     begin scalar p,r;
>       p := setpchar "? ";
>       prin2 u;
>       r := xread nil;
>       return r
>     end;
>
> Then
>
> ask_value 'x;
>
> would yield
>
> x? 199;
>
> 199
>
>     Eberhard
>
> On 13/11/14 04:08, Kostas Oikonomou wrote:
>> Does Reduce have a "read" command that can get input from the user?
>> E.g. so you can say something like
>> read("x? ", x), which will prompt for a value for x by printing "x? " on
>> the terminal.
>>
>>                          Kostas
>>
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