From: hwa@batman.corp.sgi.com (John Hwa)
Subject: Re: Question about Datascribe.
Organization: Silicon Graphics, Inc.
Date: Fri, 24 Jul 1992 18:27:43 GMT

In article <xeno.711933047@pv34ad.vincent.iastate.edu>, xeno@iastate.edu (Gary L Snethen) writes:
|> This is my first posting to this group, etc... etc...
|> 
|> I am attempting to read in a 2d curvilinear data file that has the data
|> listed bidirectionally...  Let me illustrate:
|> 
|> x coordinate   y coordinate    data
|> -----------------------------------
|>      0.0            0.0         2.3
|>      0.0            0.1         4.3
|>      0.0            0.2         4.2
|>      0.1            0.2         4.1
|>      0.1            0.1         3.2
|>      0.1            0.0         3.1
|>      0.2            0.0         2.3
|>      0.2            0.1         1.1
|>      0.2            0.0         2.5
|> 
|> 
|> This type of format occurs often during varios types of experimental scans
|> (whether they be ultrasonic, optical, xray, etc...) as the probe moves across
|> the surface in the following fashion:
|> 
|> >>>>>>>v
|> v<<<<<<<
|> >>>>>>>v
|> <<<<<<<<
|> 
|> -------------------------
|> 
|> Problem:  I need to coerce DataScribe into reading this format into a
|>           2d curvilinear lattice.
|> 
|> The way that made sense to me was to break the array into two components,
|> with one component representing all the odd lines and the other representing
|> all the even lines.  All the odd lines should be ordered from 1 to SIZE with
|> a stride of 1, and all the even lines from SIZE to 1 with a stride of -1.
|> When you break the output section's array up, both halves should run from
|> 1 to SIZE, this difference between the input array and output array should
|> effectively reverse the ordering of data and coordinates for every other
|> line.
|> 
|> It was very strange... when I read the data, it insisted that my source
|> array was a different size than my destination array.
|> 
|> This doesn't make any sense since 1..SIZE has the same number of elements as
|> SIZE..1
|> 
|> If I reversed the ordering in the output section as well (so now they are
|> BOTH SIZE..1), it ran fine...  it was only if ONE was SIZE..1 and the other
|> was 1..SIZE.
|> 
|> If someone could enlighten me on what I might be doing wrong, or can think
|> of a better way to do it...  PLEASE email me at:
|> 
|> 
|> xeno@iastate.edu
|> 
|> Thank you...
|> 
|> ---Xeno
|> (Gary Snethen)


I enclosed a DataScribe module below (uuencoded tar file) to accomplish what
you trying to do.  There is also an example data file Scan.data that you
can try it on.

========================= Cut Here ==========================
begin 644 Scan.tar
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