From: Jim Carter <jcarter@...>
Date: 2011-02-02T04:53:36+09:00
Subject: Returning a column vector from a 2D array

I have a @data_array variable, which is a 2 dimensional array.  If I
run a @data_array.inspect, I get the entire 2D array in string form
reporting back to me.

But I want to pick off a specific column, ie., create a column vector
from one of the columns on the array.  If I do something like
@data_array.length, I get an undefined method length, probably because
@data_array simply reference the Array ID??  If I do an
@data_array.inspect.length, this appears to give me the number of
elements in the complete array versus the actual length of the array.
I need to know the length, to read back a vector (I believe).

Is there already a method existing to do this, or do I need to go down
the road of determining 2d array length, to read back a specific column
of a 2d array through a looping structure?

Thanks

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