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Re: defining consecutive variables
*To*: mathgroup at smc.vnet.net
*Subject*: [mg99450] Re: defining consecutive variables
*From*: Pillsy <pillsbury at gmail.com>
*Date*: Wed, 6 May 2009 05:21:53 -0400 (EDT)
*References*: <gtp199$joi$1@smc.vnet.net>
On May 5, 5:35 am, Jason <jbig... at uoregon.edu> wrote:
> I have a code where I need to define a large number of variables as matri=
ces, called q1,q2,q3......qn. I'd like to be able to define them all withou=
t writing out n assignment lines, so a Do loop seems appropriate to me but =
I don't know how to assign sequential variable names. This gets the job don=
e but it is really ugly IMO
Well, in your shoes, I would avoid variable names like these. Instead,
I'd make these expressions with the head "q", and use
q[1], q[2], ..., q[n]
as my variables if at all possible. Then I could easily assign them
like so:
With[{qs = Array[q, 3]},
qs = Table[n^3, {n, 3}]];
{q[1], q[2], q[3]}
which returns
{1, 8, 27}
If you really insist on having the variables be q1, q2, q3... though,
then you can do something a little less clunky using Symbol[] instead
of ToExpression[], like so:
With[{qs = Table[Symbol[StringJoin["q", ToString[n]]], {n, 3}]},
qs = Table[n^3, {n, 3}]]
This will rapidly get annoying as you'll have a much harder time
cleaning up with Clear[] and ClearAll[], and it will be much harder to
scope assignments to the variables with Block[].
Cheers,
Pillsy
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