When sending something to plot, you should have a set of scalar
positions with data values that will become the "y". So how do you
know if something is valid in "y"? I think there might be an easier
solution that playing with the "invalid positions" arrays, but I need
to know more about what you are feeding into Plot.
David
Anybody know of a way to force the invalid positions array which is
obtained by
Extract to always be given as bytes rather than (which is sometimes the case)
integer ? I am doing x/y plots of two fields, and want to plot only
points that
are valid in both x and y. I believe that the inherent nature of the Plot
module is to plot points which are valid in x ("positions"), with no regard to
validity in y ("data").
So, I am tinkering with invalid positions arrays by extracting invalid
positions of each of 2 fields and then (assuming they are both type
byte) doing
a logical or operation to change some "0"s to "1"s. I then Replace the result
as invalid positions into the field which is then plotted.
Obviously, this will not work if the arrays are of different types and of
different lengths. Also, the form of the type int array that is returned (the
actual positions of the invalid points, or something like that) seems to be of
little use in this case. I'm aware that dx chooses which data type to return
depending on the number of invalids, because of memory issues. But this can
sure make some things unduly painful, no ?
Someone mentioned that it took 10 hrs for her message to be posted. Although I
haven't really timed it, the last few messages that I've posted (a few weeks
ago) seemed to take more like 24 hrs to register. Why so slow ? I don't recall
this being an issue in the past.
--
.............................................................................
David L. Thompson The University of Montana
mailto:[EMAIL PROTECTED] Computer Science Department
http://www.cs.umt.edu/u/dthompsn Missoula, MT 59812
Work Phone : (406)257-8530
