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histogramidx - find histogram index of a value in an array
int histogramidx (na, xa, x)int na;double *xa;double x;
histogramidx
returns the histogram index idx of a value x in an array xa with na entries
(xa[0]..xa[na-1]), such that xa[idx] < x < xa[idx+1]. Hence idx is in the range
0..na-2.
histogramidx 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
27-jul-89 changed name from histid to histogramidx PJT
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