NAME

       vnl-make-matrix - create a matrix from a one-point-per-record vnlog

SYNOPSIS

        $ cat /tmp/dat.vnl
        # i j x
        0 0 1
        0 1 2
        0 2 3
        1 0 4
        1 1 5
        1 2 6
        2 0 7
        2 1 8
        2 2 9
        3 0 10
        3 1 11
        3 2 12

        $ </tmp/dat.vnl vnl-filter -p i,x | vnl-make-matrix --outdir /tmp --prefix test_
        Writing to '/tmp/test_x.matrix'

        $ cat /tmp/test_x.matrix
        1 2 3
        4 5 6
        7 8 9
        10 11 12

DESCRIPTION

       Vnlog represents each "data item" as a line of text. This is very often what one wants,
       but at times it isn't. One example of this is matrix data: we want each line to contain a
       whole row of a matrix. This script exists for convenience, to bridge this gap.

       The input is an vnlog, coming in on STDIN and/or in files given on the commandline. This
       vnlog must have at least two fields: the least-significant (slowest-changing) index of
       each point (must be the first field), and as many value fields as desired. These points
       must be written out in order, and it is assumed that all entries in the matrix are
       specified. The output is a set of (non-vnlog) matrix files in the directory given in the
       "--outdir" argument.  These files are named "PREFIX_XXX.matrix" where "PREFIX" comes from
       --prefix (or empty) and "XXX" is the field name. These matrices can be loaded into any
       analysis tool (numpy for instance), or plotted directly with gnuplot:

        set size ratio -1
        plot "/tmp/test_x.matrix" matrix with image
        pause -1

REPOSITORY

       https://github.com/dkogan/vnlog/

AUTHOR

       Dima Kogan "<dima@secretsauce.net>"

LICENSE AND COPYRIGHT

       Copyright 2016 California Institute of Technology.

       This library is free software; you can redistribute it and/or modify it under the terms of
       the GNU Lesser General Public License as published by the Free Software Foundation; either
       version 2.1 of the License, or (at your option) any later version.

                                            2022-06-28                         VNL-MAKE-MATRIX(1)