MathGroup Archive: May 2008 [00569]

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Implementing a array assignment for custom data structure

To: mathgroup at smc.vnet.net
Subject: [mg88874] Implementing a array assignment for custom data structure
From: Salvatore Mangano <smangano at into-technology.com>
Date: Tue, 20 May 2008 02:25:41 -0400 (EDT)

Lists support a convenient syntax for element assignment:

a[[i]]=v  

Of course this syntax is syntactic sugar for:

Set[Part[a, i], v]


SparseArray's have a different structure than lists but still support the same syntax.

This leads me to believe that I should be able to implement a custom type (akin to SparseArray) that also allows this syntax (possibly using UpValues) but for the life of me I can't see how to accomplish this.

Any ideas?

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