Using hodo2plot.m to plot hodograms

In the above example, 6.7.10.2, the channels to be plotted were in the same file. An alternative Octave program, hodo2plot.m, is shipped with BSU to permit plotting hodograms when the channels to be plotted are in different files. In section 6.7.9 above, the program bmrg was used to collect all the channel 2 signals from all the different geophone depths. These were moved into a file, bmrg0002.seg. The same was done for channel 3 signals, and the result moved to a file named bmrg0003.seg. One could use program bdump to get a partial header listing and identify the trace whose geophone depth corresponded to a depth of interest. Executing hodo2plot.m from within the Octave text window results in a number of queries to the user. One specifies the two files and the trace number to plot as a hodogram (this would be the same for both files and is specified only once). The other queries are the same as in section 6.7.10.2, except there is one more query asking for how to label the two axes of the plot. This program, like hodoplot.m is useful for all multi-component data, not just down-hole data. They permit one to examine particle motion from any multi-component data, be they down-hole or surface.