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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
# AMED5 -- Median of five vectors. Each output point M[i] is the median of the
# five input points A[i],B[i],C[i],D[i],E[i]. The vector min and max are also
# computed and returned in the A and E vectors. The input vectors are modifed.
procedure amed5i (a, b, c, d, e, m, npix)
int a[ARB], b[ARB] # input vectors
int c[ARB], d[ARB], e[ARB] # input vectors
int m[ARB] # output vector (median)
int npix
int i
int temp
define swap {temp=$1;$1=$2;$2=temp}
begin
do i = 1, npix {
# Move the minimum value to A[i].
if (b[i] < a[i])
swap (b[i], a[i])
if (c[i] < a[i])
swap (c[i], a[i])
if (d[i] < a[i])
swap (d[i], a[i])
if (e[i] < a[i])
swap (e[i], a[i])
# Move the maximum value to E[i].
if (b[i] > e[i])
swap (b[i], e[i])
if (c[i] > e[i])
swap (c[i], e[i])
if (d[i] > e[i])
swap (d[i], e[i])
# Return the median value of the central three points.
if (b[i] < c[i]) {
if (c[i] < d[i]) # bcd
m[i] = c[i]
else if (b[i] < d[i]) # bdc
m[i] = d[i]
else # dbc
m[i] = b[i]
} else {
if (c[i] > d[i]) # dcb
m[i] = c[i]
else if (b[i] > d[i]) # cdb
m[i] = d[i]
else # cbd
m[i] = b[i]
}
}
end
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