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