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histid - find histogram index of a value in an array
int histid (na, xa, x)int na;double *xa;double x;
histid
returns the histogram index of a value x in an array xa with na entries
(xa[0]..xa[na-1]), such that xa[histid] < x < xa[histid+1]. Hence histid is in
the range 0..na-2.
histid returns -1 when x is outside the two extremes.
It
is assumed that the the array is an ordered array, the first element being
the lowest value.
Peter Teuben
20-jun-89 created PJT
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