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Re: Excel Headers --> Mathematica

  • To: mathgroup at smc.vnet.net
  • Subject: [mg127455] Re: Excel Headers --> Mathematica
  • From: Bill Rowe <readnews at sbcglobal.net>
  • Date: Thu, 26 Jul 2012 03:33:45 -0400 (EDT)
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  • Delivered-to: mathgroup-newout@smc.vnet.net
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On 7/25/12 at 2:31 AM, nkormanik at gmail.com (Nicholas Kormanik) wrote:

>I have a large Excel .xls file.  Miniature version shown below:

>Test1   Test2
>75        64
>58        85
>81        55
>64        63
>70        94
>88        90
>78        96
>96        98
>54        97
>75        61

>I would like to do some statistical analysis on the file in
>Mathematica 8.0.4.

>Additionally I am using Mathematica Link for Excel 3.5.

I thought this software was designed to allow usage of
Mathematica functions within Excel. If so, it really isn't
relevant to the problem you describe below

>The issue I'm now attempting to address concerns the "headers," or
>"column labels."

Given your file apparently has only one row of header
information, probably the easiest thing to do is simple drop the
first row after reading the data into Mathematica. I would do
this as follows:

data = Import[filename.xls,"XLS"][[1,2;;]];

which assumes the data of interest is in the first worksheet of
the Excel file. Alternatively, if there is an indeterminate
number of header rows or I simply didn't want to count them for
whatever reason and the data of interest is all numeric, I would
do something like:

data = Cases[Import[filename.xls,"XLS"][[1]],{_?NumericQ,_?NumericQ}];

This will read the data in the first worksheet on get rid of any
rows that don't import as a pair of numbers. Note, this pattern
is very restrictive. Comments in any column would cause that row
to be dropped. If the data was in say columns 3 and 4 of your
worksheet, all data would be dropped and the result would be an
empty list assigned to the Mathematica variable data.

The first method is not so restrictive. But this also means if
there are additional rows below the data, information in other
columns etc, those rows will also get assigned to the variable
data and likely will cause issues with further Mathematica computations.




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