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Import[...] - MAT files, unable to access variable's data via /. (Replace[...])?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg119417] Import[...] - MAT files, unable to access variable's data via /. (Replace[...])?
  • From: Eric Cousineau <eacousineau at gmail.com>
  • Date: Thu, 2 Jun 2011 19:10:22 -0400 (EDT)
  • Reply-to: comp.soft-sys.math.mathematica at googlegroups.com

This seems like an easy fix, but I can't seem to get Replace[...], or /., to substitute the variables imported from a MAT file.

The MAT file contains two variables, 'xdata' and 'ydata'. I import the data using `data = Import["./data.mat", "LabeledData"]` and it yields a set of Rule's for 'xdata' and 'ydata' with their respective data.
However, when I try `xdata /. data`, it simply returns `xdata` as a symbol.
I have checked that other basic rules work, such as `2 x /. x -> 3` returning `6`.

Anyone know what I might be doing wrong?

P.S. I am able to access the data via `data[[1,2]]`, but this is hackish and I can't guarantee the order of the variables.

I guess another question is (maybe for another post): is there a way to inspect Rule's and extract a variable's data using the variable's name, i.e., `data[["xdata"]]`, or something thereabouts? Or would /. be the best option?

I've searched around for manipulating or inspecting rules, but have found nothing conclusive.

Thanks and Gig 'em!
- Eric


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