Strange behaviour of DLIMITS

If PONGO does not seem to be doing something correctly, it is often because there are unwanted data in the error columns. This can come about when a file that does not contain errors is read (the appropriate parameters to READF have been set to zero), following one where there have been errors. Here, it should be noted that setting a column parameter in READF to zero means that no data will be read from the file into that particular area, it does not clear the data values. This is a feature rather than a bug, because it allows X and Y data from two different files to be plotted together, as long as each file contains the same number of points (the number of points read from the second file is assumed to be the number required). Although advantageous, it is possible for the internal data areas to get into a mess with this arrangement. If this seems to have happened then the command:

PONGO> clear data

should be used to clear all the data areas.