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## Re: [Axiom-math] What is the "+/" operator?

**From**: |
Ralf Hemmecke |

**Subject**: |
Re: [Axiom-math] What is the "+/" operator? |

**Date**: |
Wed, 23 May 2007 19:13:46 +0200 |

**User-agent**: |
Thunderbird 2.0.0.0 (X11/20070326) |

On 05/23/2007 06:50 PM, Bill Page wrote:

Quoting Martin Rubey <address@hidden>:

... Igor Khavkine writes:

Can someone explain this syntax? Looking at the Axiom .spad files,

`I see that it has general usage +/[...some list construction...].
`

It is old syntax for reduce and should go away.

`I very much agree. The reason is that one should give an initial value
``otherwise you might be surprised.
`
woodpecker:~/scratch>aldor -fx -laldor aaa.as
woodpecker:~/scratch>aaa
Sum: 29
Prod: 0
But if you like the
f/[a,b,c]

`syntax, you can actually define a similar things in Aldor. (I guess,
``SPAD would be just the same.)
`
Ralf
---BEGIN aaa.as
#include "aldor"
#include "aldorio"
macro Z == Integer;
Pkg: with {
/: ((Z, Z) -> Z, List Z) -> Z;
} == add {
(f: (Z, Z) -> Z) / (l: List Z): Z == {
empty? l => 0;
f(first l, f/(rest l));
}
}
main(): () == {
import from Pkg;
l1: List Z := [2,4,6,8,3,5,1];
sum: Z := (+)/l1;
prod: Z := (*)/l1;
stdout << "Sum: " << sum << newline;
stdout << "Prod: " << prod << newline;
}
main();
---END aaa.as

**[Axiom-math] What is the "+/" operator?**, *Igor Khavkine*, `2007/05/23`
**Re: [Axiom-math] What is the "+/" operator?**, *Martin Rubey*, `2007/05/23`
**Re: [Axiom-math] What is the "+/" operator?**, *Bill Page*, `2007/05/23`
**Re: [Axiom-math] What is the "+/" operator?**,
*Ralf Hemmecke* **<=**
**Re: [Axiom-math] What is the "+/" operator?**, *Bill Page*, `2007/05/23`
**Re: [Axiom-math] What is the "+/" operator?**, *Gabriel Dos Reis*, `2007/05/23`
**Re: [Axiom-math] What is the "+/" operator?**, *Ralf Hemmecke*, `2007/05/23`
**Re: [Axiom-math] What is the "+/" operator?**, *Gabriel Dos Reis*, `2007/05/23`
**Re: [Axiom-math] What is the "+/" operator?**, *Ralf Hemmecke*, `2007/05/24`
**Re: [Axiom-math] What is the "+/" operator?**, *Gabriel Dos Reis*, `2007/05/24`
**Re: [Axiom-math] What is the "+/" operator?**, *Gabriel Dos Reis*, `2007/05/23`

**Re: [Axiom-math] What is the "+/" operator?**, *Gabriel Dos Reis*, `2007/05/23`