B: histitle( hg, routine, width );
C: void histitle(void *hg, void *routine, int width);
HISTITLE enables the user to define a general purpose routine that generates a meaningful string to be used by HISTPRINT when printing the columns of histogram data. The length of the string that is returned should be less than or equal to the argument "width" for best results.
The defined routine must be prepared to accept three arguments from HISTPRINT.
routine( value, incr, flag );
"value" is the numeric value HISTPRINT would have used if HISTITLE had not been called. "incr" is the increment between successive values. "flag" has one of the three following values.
expl b lib hist
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