Okay, I see the answer is no it can't be done.
Thx,
Rich
----- Original Message -----
From: "Richard Hennessy" <rich.hennessy at verizon.net>
To: "Maxima List" <maxima at math.utexas.edu>
Sent: Sunday, October 04, 2009 3:05 PM
Subject: Re: [Maxima] Void in Maxima
>I still have this wrong. Third attempt.
>
> Is there a way to cause a function to have no return value. I would like
> to
> have the ability to have no return value like you can
> do in C++ with the void keyword. I tried
>
> f(x) := block(return());
>
> but that returns false which is not the same as no return value at all.
> Also this would have to be conditional too.
>
> So
>
> f(x):= block(if x > 0 then return(void) else return -1);
>
> It would be nice and necessary also that no output label would be created
> if
> the function returns nothing. So in this case if f(-9)
> would get an output label created but f(9) would get no output label. All
> operations attempting to operate on the return value of nothing would also
> cause a lisp error.
>
> (%i1) f(x):= block(if x > 0 then return(void) else return -1)$
> (%i2) f(-9);
> (%o2) -1
> (%i3) %*9;
> (%o3) -9
> (%i4) f(9);
> (%i5) %*9;
> Maxima has encountered a lisp error. Can not operate on nothing.
>
> Rich
>
>
> ----- Original Message -----
> From: "Richard Hennessy" <rich.hennessy at verizon.net>
> To: "Maxima List" <maxima at math.utexas.edu>
> Sent: Sunday, October 04, 2009 9:16 AM
> Subject: Re: [Maxima] Void in Maxima
>
>
>> Sorry I was a little confused about how to explain this better and I made
>> a mistake. The example should read
>>
>> (%i1) f(x):= block(if x > 0 then return(void) else return -1)$
>> (%i2) f(-9);
>> (%i3) %*9;
>> (%o3) -9
>> (%i4) f(9);
>> (%i5) %*9;
>> Maxima has encountered a lisp error. Can not operate on nothing.
>>
>> Rich
>>
>> ----- Original Message -----
>> From: "Richard Hennessy" <rich.hennessy at verizon.net>
>> To: "Maxima List" <maxima at math.utexas.edu>
>> Sent: Sunday, October 04, 2009 9:09 AM
>> Subject: Void in Maxima
>>
>>
>> Is there a way to cause a function to have no return value. I would like
>> to have the ability to have no return value like you can
>> do in C++ with the void keyword. I tried
>>
>> f(x) := block(return());
>>
>> but that returns false which is not the same as no return value at all.
>> Also this would have to be conditional too.
>>
>> So
>>
>> f(x):= block(if x > 0 then return(void) else return -1);
>>
>> It would be nice and necessary also that no output label would be created
>> if the function returns nothing. So in this case if f(9)
>> would get an output label created but f(-9) would get no output label.
>> All operations attempting to operate on the return value of
>> nothing would also cause a lisp error.
>>
>>
>> (%i1) f(x):= block(if x > 0 then return(void) else return -1)$
>> (%i2) f(9);
>> (%i3) %*9;
>> (%o3) 81
>> (%i4) f(-9);
>> (%i5) %*9;
>> Maxima has encountered a lisp error. Can not operate on nothing.
>>
>> Is there a way to do this?
>>
>> Rich
>>
>>
>>
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>>
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