Why infeval?
-s
On Sep 25, 2013 12:47 PM, "Jaime Villate" <villate at fe.up.pt> wrote:
> I think that the result Christian was expecting is what you get from:
>
> for j:1 thru 2 do (
> concat (b,j) :: 10*j,
> print (ev (concat (b,j), infeval)));
>
> There is a very nice old book: Darren Redfern, Edgar Chandler and Richard
> N. Fell, Macsyma ODE Lab Book, 1998, where the authors use concat() and
> ''(...) very intensely.
> They do switch from ''(concat(...)) to ev(concat(...),infeval) inside for
> loops.
>
> I do agree that concat(...) and ''(...) should be avoided in favor of
> other better ways to do the same.
> Regards,
> Jaime
>
>
> On 25-09-2013 12:16, Stavros Macrakis wrote:
>
> ''(...) Is *read-time* substitution, a very special-purpose mechanism.
> Try ev(...).
>
> But why are you creating variables in this strange way in the first place?
> Why not use a[i]?
>
> Also, how did you learn about ''(...) and concat? I wonder if there's
> some documentation or tutorial that's miseducating people... we see this
> problem often.
>
> -s
> On Sep 25, 2013 5:21 AM, "Christian Stengg" <christian.stengg at gmx.at>
> wrote:
>
>> Hello,
>>
>> why do I get the output bj in the loop?
>>
>> Thanks for any help,
>> Christian
>>
>>
>> i:1;
>> concat(a,i)::10*i;
>> ''(concat(a,i));
>> print(''(concat(a,i)));
>>
>> for j:1 thru 2 do (
>> concat(b,j)::10*j,
>> print(''(concat(b,j)))
>> );
>>
>> b1;
>> b2;
>>
>>
>> (%o1) 1
>> (%o2) 10
>> (%o3) 10
>> 10
>> (%o4) 10
>> bj
>> bj
>> (%o5) done
>> (%o6) 10
>> (%o7) 20
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>
>
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