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labeling problem
*To*: mathgroup at smc.vnet.net
*Subject*: [mg46430] labeling problem
*From*: Janos <janos.lobb at yale.edu>
*Date*: Wed, 18 Feb 2004 00:36:53 -0500 (EST)
*Sender*: owner-wri-mathgroup at wolfram.com
Before I re-invent the wheel let me ask:
I need to assign names to list elements in a nested list based upon
their position in the nested list. For example if I have a list:
lst = {{a,b},{c,d},e,f,{g,h,i},j,k,{l.m},{n,o,p},q,{r,s},{{t}}}
then
pos=Position[lst,{_,_,_}] will give me
{{5}.{9}}
Now, I am thinking to assign a unique name to the list elements on
these positions, like p5={g,h,i} and p9={n,o,p}. I did not find yet
how to create variable names with concatenation auto-magically from
program. In other programming languages I can do something like this:
var="p"+NumToString[5]
&var={a,b,c}
and I could refer to it afterward as p5 and its value would be {a,b,c}.
The most handy would be if I could take just the name of the position
and assign that to it, like:
For[i=1, i<=Length[pos], i++, NumberToName[pos[[i]]]=lst[[pos[[i]] ]] ]
and I would get:
five={g,h,i} and nine={n,o,p}.
Of course lst[[pos[[i]] ]] where' i' goes from 1 to 2 is somewhat doing
it but it is a little bit complicated.
I looked the book and the online documentation but could not find a
function called NumberToName which would do
NumberToName[5]
five
and vice versa
NameToNumber[five]
5
Is there such function or procedure in someone's drawer ?
If not, then what is the right way to get a unique variable name with
some clear deterministic nature - like above - from Mathematica ?
Thanks ahead,
János
------------------------------------------
"There was a mighty king in the land of the Huns whose goodness and
wisdom had no equal."
Nibelungen-Lied
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