(no subject)

[Jon]

Marielle:

Thanks for your thoughts.  Others on the list have demonstrated to my 
satisfaction that there is no easy way to actually use the Rev language 
to manipulate the arrays in an efficient manner, Jim's comments 
notwithstanding.  If I'm willing to use externals of any sort, it is 
easy to speed things up.  My interest was only in writing portable code 
with Rev, not in learning or using ancillary facilities, if which there 
are myriad I'm sure.

:)

Jon



Marielle Lange wrote:

>>Jon,
>>
>>My point exactly: "a large array of numbers" = "data" So is the photograph
>>you are computing the histogram on. Would either of these change, if you
>>switch languages? Hence, they are external to your language, or "data."
>>
>>I write business application software, so I've never had to compute a
>>histogram and admit I have no clue as to what's involved in that process.
>>
>>But, if you know the kind of data manipulation you will be doing in advance,
>>you can parse, index, or otherwise reorganize the source data in such a way
>>as to minimize large data sources or "large arrays."
>>
>>Now, depending on how well you organized your data, whether your language is
>>in pcode or machine compiled, results in only milliseconds of difference.
>>    
>>
>
>Jim,
>
>I support your view... I often have to manipulate huge lexical databases (50.000
>lines, 50 columns). Usint the same computer language, I was often able to cut
>running time down from 30 minutes to 2 min. by using more effective resource
>management techniques.
>
>Jon,
>
>If you cannot see ways in which you can reorganize your data... why not consider
>using Awk for your array processing (something that Awk excels at). Awk is
>freely available on any platform, doesn't take more than 200K, and can be
>learned in one day for your purpose (simple array processing). It is quite easy
>to call to it to do array processing on large data and get the result back to
>revolution. You will find information about Awk at
><http://www.cs.wustl.edu/~loui/sigplan> (Why GAWK for AI?)
><http://revolution.lexicall.org/wiki/tiki-index.php?page=ProgrammingAwk>
>
>Marielle
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>
>  
>