RE: [Q] How to get rid of {} in lists?
- To: mathgroup@smc.vnet.net
- Subject: [mg10729] RE: [mg10710] [Q] How to get rid of {} in lists?
- From: Jean-Marie THOMAS <jmthomas@cybercable.tm.fr>
- Date: Mon, 2 Feb 1998 00:44:23 -0500
- Return-Receipt-To: Jean-Marie THOMAS <jmthomas@cybercable.tm.fr>
In this kind of situation, I use one of the following methods:
- use Apply:
Apply[And,{True,False,True}] will return False This works when the
function is "flat"
- use List->Sequence:
f[{a,b,c}/.List->Sequence] will be evaluated as f[a,b,c] Mind the fact
that f[{{a,b},{c,d}}/.List->Sequence] will evaluate as f[a,b,c,d]
- in other cases, you will have to sparse your arguments: if for
instance your variable is v={a,{a,b}} and your function something like
f[x,y], use f[First@v,Last@v]
Hope this helps,
-----------------------------------------------
Jean-Marie THOMAS
Conseil et Audit en Ingenierie de Calcul jmthomas@cybercable.tm.fr
+33 (0)3 88 32 93 64
www.cybercable.tm.fr/~jmthomas
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-----Message d'origine-----
De: Alessandro Rossi [SMTP:rossiale@cisco-ags.unive.it] Date: vendredi
30 janvier 1998 10:25 A: mathgroup@smc.vnet.net
Objet: [mg10710] [Q] How to get rid of {} in lists?
Hi all: that's my problem...it seems to me very easy but I caan get out
of it with a solution:
I'd like to put the ordered elements of a list as parameters in a
function...
e.g.
list={True, False};
And[list] is not And[True, False]... how can I get rid of {} in order to
perform the calculation???
thanks in advance
Alessandro