Re: RE: Joining lists
- To: mathgroup at smc.vnet.net
- Subject: [mg37842] Re: [mg37824] RE: [mg37810] Joining lists
- From: Andrzej Kozlowski <andrzej at tuins.ac.jp>
- Date: Fri, 15 Nov 2002 01:34:47 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
Not doing what? Do (in Mathematica, not other languages) produces no
output! For example:
In[6]:=
a=3;
In[7]:=
Do[a,{20}]
You can use Do to produce side-effects, as in:
In[8]:=
Do[Print[a],{20}]
If you want output use Table.
In fact
Flatten[Table[{{a[[i]],b[[i]]}},{i,3}],1] is another way o get your
output, but of course Transpose[a,b] is much nicer.
On Thursday, November 14, 2002, at 08:11 PM, Pigeon, Robert wrote:
> Sorry... I just cut and paste from a Notebook!
>
> Here what I am trying to do:
> a={1,2,3};
> b={4,5,6};
> c={{a[[1]],b[[1]]},{a[[2]],b[[2]]},{a[[3]],b[[3]]}}
> {{1,4},{2,5},{3,6}}
>
> I tried: Do[{{a[[i]],b[[i]]}},{i,3}] And it is not working.
>
> Since my first posting I found that Transpose[{a,b}] will do it.
>
> But I would like to know why the Do loop is not doing it !
>
> Thanks,
>
> Robert
>
> -----Original Message-----
> From: Pigeon, Robert [mailto:Robert.Pigeon at drdc-rddc.gc.ca]
To: mathgroup at smc.vnet.net
> To: mathgroup at smc.vnet.net
> Subject: [mg37842] [mg37824] [mg37810] Joining lists
>
>
> Good day,
> Here what I am trying to do:
> <<...OLE_Obj...>>
> <<...OLE_Obj...>>
> <<...OLE_Obj...>>
> <<...OLE_Obj...>>
> Of course my two lists are a lot larger ! So, I would like to build
> the new
> list c automatically, from the first item to the last of my lists
> (number of
> items is equal in both lists). I tried:
> <<...OLE_Obj...>>
> <<...OLE_Obj...>>
> and other things. But it does not work.
>
> At the end I want to plot (ListPlot) the new list.
>
> Any suggestion?
>
> Thanks
>
>
> Robert Pigeon
>
>
>
>
>
Andrzej Kozlowski
Yokohama, Japan
http://www.mimuw.edu.pl/~akoz/
http://platon.c.u-tokyo.ac.jp/andrzej/