From: Tassilo Horn <tassilo@member.fsf.org>
To: Peter Dyballa <Peter_Dyballa@Web.DE>
Cc: help-gnu-emacs@gnu.org
Subject: Re: Emacs Calc - Npr and NCR functions
Date: Wed, 20 Jul 2011 16:49:36 +0200 [thread overview]
Message-ID: <87ei1lknwf.fsf@tsdh.uni-koblenz.de> (raw)
In-Reply-To: <8A6A663F-52C9-4D8D-AE7A-24294B3D5847@Web.DE> (Peter Dyballa's message of "Wed, 20 Jul 2011 15:00:54 +0200")
Peter Dyballa <Peter_Dyballa@Web.DE> writes:
Hi Peter,
>>> Does anyone know how to access the Npr and Ncr functions with Emacs
>>> calc?
>>
>> What are those functions?
>
> Combinatorics, Binomial coefficients, permutations, combinations. Some
> desk or pocket calculators provide such functions.
>
> I think nPr is n!/(n-k)! and nCr is n!/k!(n-k)!...
Ok, so the functions and keys are:
,----[ (info "(calc)Combinatorial Functions") ]
| The `k c' (`calc-choose') [`choose'] command computes the binomial
| coefficient `N'-choose-`M', where `M' is the number on the top of the
| stack and `N' is second-to-top. If both arguments are integers, the
| result is an exact integer. Otherwise, the result is a floating-point
| approximation. The binomial coefficient is defined for all real
| numbers by `N! / M! (N-M)!'.
`----
,----[ (info "(calc)Combinatorial Functions") ]
| The `H k c' (`calc-perm') [`perm'] command computes the
| number-of-permutations function `N! / (N-M)!'.
`----
Bye,
Tassilo
next prev parent reply other threads:[~2011-07-20 14:49 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-20 8:47 Emacs Calc - Npr and NCR functions Daniel Dalton
2011-07-20 10:54 ` Tassilo Horn
2011-07-20 13:00 ` Peter Dyballa
2011-07-20 14:49 ` Tassilo Horn [this message]
2011-07-20 15:55 ` Alberto Luaces
2011-07-21 11:45 ` Daniel Dalton
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