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<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica">Hello Swifters,</p>
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<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica">I have a question about using two filesys_mappers and the foreach construct. I have attached the offending .swift script I am working with for reference. Here's the gist of what i'm trying
to do and what appears to be happening instead: </p>
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<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica">I have a program called 'boot' that takes as command line arguments 4 file paths (log, out, data, and meta), and a number of other params (all numerical and seem to be getting passed in correctly,
so no worries there). 'log' and 'out' are output files and 'data' and 'mata' are input files (located in directories called 'out' and 'in' respectively). The problem i'm having is with getting the correct values for 'data' and 'meta' passed in to my app
call. I have an app section called processData that invokes boot. I will be assuming the the directory 'in' contains identically named data and meta files that differ only in their suffix ('.dat' or '.meta', respectively). This may or may not be safe, but
for now it is fine and I'll cross that bridge when I come to it. Here's the relevant snippet from my script:</p>
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<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica">app (clusFile out) processData (dataFile data, metaFile meta, logFile log){</p>
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<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica"> boot "-log" @log "-results" @out "-meta" @meta "-data" @data "-kmin" kmin "-kmax" kmax "-eps" eps "-bootpct" bootpct "-maxiterations" maxiterations "-maxtries" maxtries;</p>
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<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica">}</p>
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<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica">dataFile dataFiles[] <filesys_mapper;location="in",sufix="dat">;</p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica">metaFile metaFiles[] <filesys_mapper;location="in",sufix="meta">;</p>
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<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica">foreach f,i in dataFiles {</p>
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<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica"> clusFile o<single_file_mapper; location="out", file=@strcat("out/clusFile.",i,".clus")>;</p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica"> logFile l<single_file_mapper; location="out", file=@strcat("out/logFile.",i,".log")>;</p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica"> o = processData(f, metaFiles[i], l);</p>
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<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica">}</p>
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<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica">this configuration causes processData to be invoked as: </p>
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<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica">out/clusFile.0.clus = processData(dataFile0.dat, dataFile0.dat, out/logFile.0.log);</p>
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<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica">if i switch around the oder of the filesys_mappers so that the snippet reads:</p>
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<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica">metaFile metaFiles[] <filesys_mapper;location="in",sufix="meta">;</p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica">dataFile dataFiles[] <filesys_mapper;location="in",sufix="dat">;</p>
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<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica">foreach f,i in dataFiles {</p>
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<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica"> clusFile o<single_file_mapper; location="out", file=@strcat("out/clusFile.",i,".clus")>;</p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica"> logFile l<single_file_mapper; location="out", file=@strcat("out/logFile.",i,".log")>;</p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica"> o = processData(f, metaFiles[i], l);</p>
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<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica">}</p>
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<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica">the app invocation is called as:</p>
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<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica">out/clusFile.o.clus = processData(dataFile0.meta, dataFile0.meta, out/logFile.0.log);</p>
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<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica">I guess the real question is this: what is the most appropriate way in swift to pass into a app invocation two corresponding input files? Ideally, it would be something like 'foreach file1,file2,i
in inputFiles[][] { … } but that doesn't really make too much sense either.</p>
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<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica">Anyway, any ideas would be appreciated.</p>
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<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica">Cheers,</p>
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica">Robin</p>
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<div>Robin M. Weiss</div>
<div>Research Programmer</div>
<div>Research Computing Center</div>
<div>The University of Chicago</div>
<div>6030 S. Ellis Ave., Suite 289C</div>
<div>Chicago, IL 60637</div>
<div><b><a href="mailto:labello@uchicago.edu">robinweiss@uchicago.edu</a></b></div>
<div>773.702.9030</div>
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