Re: How can I get list form like this
- To: mathgroup at smc.vnet.net
- Subject: [mg91883] Re: How can I get list form like this
- From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
- Date: Thu, 11 Sep 2008 06:17:47 -0400 (EDT)
- Organization: The Open University, Milton Keynes, UK
- References: <ga82tt$rh1$1@smc.vnet.net>
863 wrote:
> As we know f/@Range[n] gives a list {f[1],f[2],f[3],=85=85};
> Here what I want is a list form like this{f[[1]],f[[2]],=85=85}(*It's too
> tedious to type one by one*)
> It means the 1st,2nd,=85=85part of list f.
> Looks similar to each other, however I can't figure it out.
> How to do this ?
Map a pure function such as f[[#]]&. For instance, depending on whether
the expression holds some values before the mapping or not,
In[1]:= f = {1.1, 1.2, 1.3};
(f[[#1]] & ) /@ Range[3]
Out[2]= {1.1, 1.2, 1.3}
In[3]:= (HoldForm[g[[#1]]] & ) /@ Range[3]
g = {1, 2, 3};
ReleaseHold[%%]
Out[3]= {HoldForm[g[[1]]], HoldForm[g[[2]]], HoldForm[g[[3]]]}
Out[5]= {1, 2, 3}
Regards,
-- Jean-Marc