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# SUMFLUX -- Sum up the flux in a specified bandpass
procedure sumflux (sh, x, y, s, n, eqx1, eqx2, eqy1, eqy2,
sum, rsum, esum, ctr)
pointer sh
real x[n], y[n], s[n]
int n
real eqx1, eqx2, eqy1, eqy2
real sum[2], rsum[2], esum[2], ctr[2]
real slope, csum[2], sum2[2], rampval, scale, delta, wpc
real w1, w2
int i, i1, i2
bool fp_equalr()
begin
call fixx (sh, eqx1, eqx2, eqy1, eqy2, i1, i2)
slope = (eqy2-eqy1) / (eqx2-eqx1)
sum[1] = 0.0
rsum[1] = 0.0
esum[1] = 0.0
csum[1] = 0.0
sum2[1] = 0.0
scale = 0.0
for (i=i1+1; i <= i2-1; i = i+1)
scale = max (scale, y[i])
if (scale <= 0.)
scale = 1.
for (i=i1+1; i <= i2-1; i = i+1) {
rampval = eqy1 + slope * (x[i] - eqx1)
sum[1] = sum[1] + y[i]
rsum[1] = rsum[1] + rampval
if (!IS_INDEF(esum[1])) {
if (fp_equalr (0., rampval/scale))
esum[1] = INDEF
else
esum[1] = esum[1] + (1. - y[i] / rampval)
}
}
for (i=i1+1; i <= i2-1; i = i+1) {
rampval = eqy1 + slope * (x[i] - eqx1)
delta = (y[i] - rampval) / scale
csum[1] = csum[1] + abs(delta)**1.5 * x[i]
sum2[1] = sum2[1] + abs(delta)**1.5
}
# end points
if (eqx1 < x[i1]) {
if (i1 > 1)
w1 = (x[i1] - eqx1) / (x[i1] - x[i1-1])
else
w1 = (x[i1] - eqx1) / (x[i1+1] - x[i1])
} else {
if (i1 < n)
w1 = (x[i1] - eqx1) / (x[i1+1] - x[i1])
else
w1 = (x[i1] - eqx1) / (x[i1] - x[i1-1])
}
if (eqx2 < x[i2]) {
if (i2 > 1)
w2 = (x[i2] - eqx2) / (x[i2] - x[i2-1])
else
w2 = (x[i2] - eqx2) / (x[i2+1] - x[i2])
} else {
if (i2 < n)
w2 = (x[i2] - eqx2) / (x[i2+1] - x[i2])
else
w2 = (x[i2] - eqx2) / (x[i2] - x[i2-1])
}
w2 = 1.0 - w2
sum[1] = sum[1] + w1 * y[i1] + w2 * y[i2]
rsum[1] = rsum[1] + w1 * eqy1 + w2 * eqy2
if (!IS_INDEF(esum[1])) {
if (fp_equalr (0., eqy1/scale)|| fp_equalr (0., eqy2/scale))
esum[1] = INDEF
else
esum[1] = esum[1] + w1 * (1. - y[i1] / eqy1) +
w2 * (1. - y[i2] / eqy2)
}
delta = (y[i1] - eqy1) / scale
csum[1] = csum[1] + w1 * abs(delta)**1.5 * eqx1
sum2[1] = sum2[1] + w1 * abs(delta)**1.5
delta = (y[i2] - eqy2) / scale
csum[1] = csum[1] + w2 * abs(delta)**1.5 * eqx2
sum2[1] = sum2[1] + w2 * abs(delta)**1.5
if (sum2[1] != 0.0)
ctr[1] = csum[1] / sum2[1]
else
ctr[1] = 0.0
# Correct for angstroms/channel
if (i1 != i2)
wpc = abs ((x[i2] - x[i1]) / (i2 - i1))
else if (i1 < n)
wpc = abs (x[i1+1] - x[i1])
else
wpc = abs (x[i1-1] - x[i1])
sum[1] = sum[1] * wpc
if (!IS_INDEF(esum[1]))
esum[1] = esum[1] * wpc
rsum[1] = rsum[1] * wpc
# Errors (Note there are no errors in the ramp values).
if (!IS_INDEF(s[1])) {
sum[2] = 0.0
rsum[2] = 0.0
esum[2] = 0.0
csum[2] = 0.0
sum2[2] = 0.0
for (i=i1+1; i <= i2-1; i = i+1) {
rampval = eqy1 + slope * (x[i] - eqx1)
sum[2] = sum[2] + s[i]**2
if (!IS_INDEF(esum[1])) {
if (fp_equalr (0., rampval/scale))
esum[2] = INDEF
else
esum[2] = esum[2] + (s[i] / rampval) ** 2
}
}
for (i=i1+1; i <= i2-1; i = i+1) {
rampval = eqy1 + slope * (x[i] - eqx1)
delta = (y[i] - rampval) / scale
csum[2] = csum[2] + abs(delta)*((x[i]-ctr[1])*s[i]) ** 2
}
# endpoints
sum[2] = sum[2] + (w1 * s[i1])**2 + (w2 * s[i2])**2
if (!IS_INDEF(esum[1])) {
if (fp_equalr (0., eqy1/scale)|| fp_equalr (0., eqy2/scale))
esum[2] = INDEF
else
esum[2] = esum[2] + (w1 * s[i1] / eqy1) ** 2 +
(w2 * s[i2] / eqy2) ** 2
}
delta = (y[i1] - eqy1) / scale
csum[2] = csum[2] + abs(delta)*(w1*(eqx1-ctr[1])*s[i1]) ** 2
delta = (y[i2] - eqy2) / scale
csum[2] = csum[2] + abs(delta)*(w2*(eqx2-ctr[1])*s[i2]) ** 2
if (sum2[1] != 0.0)
ctr[2] = 1.5 / scale * sqrt (csum[2]) / sum2[1]
else
ctr[2] = 0.0
sum[2] = sqrt (sum[2])
esum[2] = sqrt (esum[2])
# Correct for angstroms/channel
sum[2] = sum[2] * wpc
if (!IS_INDEF(esum[1]))
esum[2] = esum[2] * wpc
}
end
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