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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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