In article <3CDEDA2C.8504C17C@gmx.de> , Christoph Hormann 
<chr### [at] gmxde>  wrote:

> I'm not sure what you mean by 'sum' function

For example allowing functions equivalent to

10
---
\
 >  i*2+4
/
---
i=1

inside functions, would that help?

    Thorsten

____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde

Visit POV-Ray on the web: http://mac.povray.org

Post a reply to this message

Thorsten Froehlich wrote:
> 
> In article <3CDEDA2C.8504C17C@gmx.de> , Christoph Hormann
> <chr### [at] gmxde>  wrote:
> 
> > I'm not sure what you mean by 'sum' function
> 
> For example allowing functions equivalent to
> 
> 10
> ---
> \
>  >  i*2+4
> /
> ---
> i=1
> 
> inside functions, would that help?
> 

That would be nice but it would not help much in this particular case and
is in fact not necessary since this can already be done using #while
inside functions.  In the example i gave i could have put a 'function {}'
around the while loop, leave out the #declare's and just sum up things
with the loop, this would avoid the recursion problem, but this does not
work if you build several functions in the while loop and don't want to
split into separate loops for speed reasons.

Christoph

-- 
POV-Ray tutorials, IsoWood include,                 
TransSkin and more: http://www.tu-bs.de/~y0013390/  
Last updated 05 May. 2002 _____./\/^>_*_<^\/\.______

Post a reply to this message

ingo wrote:
> 
> [...]
> 
> Unless it changes the meaning completely, I think I'll leave out the word
> "recursion", to prevent the idea that recursive functions are possible.
> 

All right.

Christoph

-- 
POV-Ray tutorials, IsoWood include,                 
TransSkin and more: http://www.tu-bs.de/~y0013390/  
Last updated 05 May. 2002 _____./\/^>_*_<^\/\.______

Post a reply to this message

In article <3CDEE57F.29ECF6D5@gmx.de> , Christoph Hormann 
<chr### [at] gmxde>  wrote:

> That would be nice but it would not help much in this particular case and
> is in fact not necessary since this can already be done using #while
> inside functions.

Keep in mind that the "1" and "10" could be expressions and it is also
faster...  ;-)

    Thorsten

____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde

Visit POV-Ray on the web: http://mac.povray.org

Post a reply to this message

Thorsten Froehlich wrote:
> 
> [...]
> 
> Keep in mind that the "1" and "10" could be expressions and it is also
> faster...  ;-)

I would not mind if you implement this, it certainly has it's uses.  While
you are on it, how about custom vector functions, something like:

function { <x^2, sin(z), z> }

;-)

Christoph

-- 
POV-Ray tutorials, IsoWood include,                 
TransSkin and more: http://www.tu-bs.de/~y0013390/  
Last updated 05 May. 2002 _____./\/^>_*_<^\/\.______

Post a reply to this message

In article <3CDF5F7D.CA29C09C@gmx.de> , Christoph Hormann 
<chr### [at] gmxde>  wrote:

> it certainly has it's uses.

I am sure some crazy person will figure out some even more crazy applications


> I would not mind if you implement this,

Who knows, maybe it already exists somewhere on my and a few other harddisks.

> While you are on it, how about custom vector functions, something like:
>
> function { <x^2, sin(z), z> }
>
> ;-)

Users!  You give them one feature and they start crying for the next! ;-)

Unfortunately, vectors are more difficult to implement :-(

    Thorsten

____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde

Visit POV-Ray on the web: http://mac.povray.org

Post a reply to this message

On Mon, 13 May 2002 13:15:38 +0200, "Thorsten Froehlich" <tho### [at] trfde>
wrote:
> I am sure some crazy person will figure out some even more crazy applications
> for it.  Warp?  W?odzimierz?  ;-)

Question marks. That's what makes people crazy. ;-)

> Unfortunately, vectors are more difficult to implement :-(

Don't give up. :-)

ABX

Post a reply to this message

Thorsten Froehlich <tho### [at] trfde> wrote:
> I am sure some crazy person will figure out some even more crazy applications


  It would be really useful if you could also specify the operation which
is performed.
  That is, as a sum it is something like:

result = 0;
for(n=initial_value; n<=final_value; ++n) result = result + expression(n);

  This would be much more useful if it were more generic, that is:

result = 0;
for(n=initial_value; n<=final_value; ++n) result = expression(result, n);

if you understand what I mean.
  You could implement a sum, a multiplication or whatever you want.

> Unfortunately, vectors are more difficult to implement :-(

  It would be nice if the parameters to a function could be vectors as well
as floats. This would be useful in some situations.

-- 
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -

Post a reply to this message

Thorsten Froehlich wrote:
> 
> [...]
> 
> Users!  You give them one feature and they start crying for the next! ;-)

What did you expect? ;-)

> Unfortunately, vectors are more difficult to implement :-(
> 

There are already vector functions in form of spline functions, but i
suppose this is something different.

Christoph

-- 
POV-Ray tutorials, IsoWood include,                 
TransSkin and more: http://www.tu-bs.de/~y0013390/  
Last updated 05 May. 2002 _____./\/^>_*_<^\/\.______

Post a reply to this message

On Mon, 13 May 2002 13:15:38 +0200, "Thorsten Froehlich" <tho### [at] trfde>
wrote:
> Users!  You give them one feature and they start crying for the next! ;-)

Btw such conclusion, have you noticed my hidden request posted somewhere about
gate between functions and polynomial solver ? I told I would try to implement
it in the future but perhaps it already exists on some of your drives... :-)

ABX

Post a reply to this message