Opened 8 years ago

Last modified 2 years ago

#11576 needs_work enhancement

make it possible to generate sequences of variables easily — at Initial Version

Reported by: kcrisman Owned by: burcin
Priority: major Milestone: sage-6.4
Component: symbolics Keywords: Cernay2012
Cc: jason, iandrus, mjo, eviatarbach, slelievre Merged in:
Authors: Reviewers:
Report Upstream: N/A Work issues:
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Dependencies: Stopgaps:


People are always asking how to get sequences of variables, like a1,a2,a3,a4 or the like. See this question, for example.

Jason Grout has an interesting possible solution that should find a home somewhere in Sage.

class VariableGenerator(object): 
     def __init__(self, prefix): 
         self.__prefix = prefix 
     def __getitem__(self, key): 
         return SR.var("%s%s"%(self.__prefix,key)) 
Now just specify a prefix, and then you can index to your heart's 
content to generate variables. 
a=VariableGenerator('a') # some people may like 'a_' as the prefix 
a[0], a[1], a[2] # all variables 
Of course, this can easily be extended to using function call syntax: 
a(0), or to using multiple indices: a[1,3].  Indeed, you can let your 
imagination run wild and even do things like return full symbolic 
matrices or vectors with slices: a[0:5, 0:5]. 

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