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include <gio.h>
include <gset.h>
include <mach.h>
define A0 (-1.74743)
define A1 (0.73)
define A2 (-0.24)
define A3 (0.035)
define MAXDEN 6.0
# T_SELFTEST -- a test procedure for the DTOI package. Two intensity vectors
# are calculated in different ways and compared. A plot of the residuals is
# shown. A plot showing the extent of truncation errors is also drawn. Two
# standard ranges of data values are available: 12 bit, representing PDS
# format data and 15 bit, representing the FITS data format available on the
# PDS. Any other choice results in a small test, ranging from 1 - 144.
procedure t_selftest
bool verbose
char device[SZ_FNAME]
pointer sp, intk, intc, raw, den, gp
int min_raw, max_raw, nvalues, i, nbits
real scale, factor, ceiling
bool clgetb()
pointer gopen()
int clgeti()
real clgetr()
begin
call smark (sp)
nbits = clgeti ("nbits")
switch (nbits) {
case 12:
min_raw = 1
max_raw = 3072
scale = 0.00151
case 15:
min_raw = 1
max_raw = 24576
scale = 4.65 / 24575.
case 0:
call eprintf ("Using test data range from 1 - 144\n")
min_raw = 1
max_raw = 144
scale = 0.0325
default:
call eprintf ("Unknown case: nbits = '%d', Please supply values:\n")
call pargi (nbits)
min_raw = 1
max_raw = clgeti ("max_raw")
# max density = 6.0. Density = raw value * scale.
call clputr ("scale.p_maximum", real (MAXDEN / max_raw))
call clputr ("scale.p_default", real (4.65 / (max_raw - 1)))
scale = clgetr ("scale")
}
call clgstr ("device", device, SZ_FNAME)
verbose = clgetb ("verbose")
ceiling = clgetr ("ceiling")
gp = gopen (device, NEW_FILE, STDGRAPH)
nvalues = max_raw - min_raw + 1
call salloc (intk, nvalues, TY_REAL)
call salloc (intc, nvalues, TY_REAL)
call salloc (den, nvalues, TY_REAL)
call salloc (raw, nvalues, TY_REAL)
do i = 1, nvalues
Memr[raw+i-1] = min_raw + i - 1
call amulkr (Memr[raw], scale, Memr[den], nvalues)
call hd_known (min_raw, max_raw, scale, Memr[intk], nvalues)
call hd_calc (min_raw, max_raw, scale, Memr[intc], nvalues)
if (verbose) {
factor = ceiling / Memr[intc+nvalues-1]
call printf ("# %20tRaw Value %40tDensity %60tIntensity\n\n")
do i = 1, nvalues {
call printf ("%20t%d %40t%g %60t%g\n")
call pargi (i)
call pargr (Memr[den+i-1])
call pargr (Memr[intc+i-1] * factor)
}
}
call hd_plotit (gp, Memr[den], Memr[intk], Memr[intc], nvalues)
call hd_trunc (gp, Memr[den], nvalues, ceiling, Memr[intc])
call gclose (gp)
call sfree (sp)
end
# HD_KNOWN -- Calculate vector of known intensity values.
procedure hd_known (min_raw, max_raw, scale, intk, nvalues)
int min_raw # Minimum raw data value
int max_raw # Maximum raw data value
real scale # Density = raw_value * scale
real intk[nvalues] # Known intensities - filled on return
int nvalues # Number of intensity values requested
int i
real density, logo
real exp
begin
do i = min_raw, max_raw {
density = max (EPSILONR, i * scale)
logo = log10 ((10. ** density) - 1.0)
exp = A0 + A1 * logo + A2 * logo ** 2 + A3 * logo ** 3
intk[i] = 10 ** (exp)
}
end
# HD_CALC -- Calcuate vector of intensity values as in HDTOI.
procedure hd_calc (min, max, scale, intc, nvalues)
int min # Minimum raw data value
int max # Maximum raw data value
real scale # Density = raw_value * scale
real intc[nvalues] # Calculated intensity values - filled on return
int nvalues # Number of intensity values requested
real cfit[9]
pointer sp, lut
begin
call smark (sp)
call salloc (lut, nvalues, TY_REAL)
cfit[1] = 5.0
cfit[2] = 4.0
cfit[3] = -10.0
cfit[4] = MAXDEN
cfit[5] = 1.
cfit[6] = A0
cfit[7] = A1
cfit[8] = A2
cfit[9] = A3
call st_wlut (Memr[lut], min, max, scale, cfit)
call st_transform (min, max, Memr[lut], nvalues, intc)
call sfree (sp)
end
# HD_TRUNC -- Investigate truncation errors for real versus int output image.
procedure hd_trunc (gp, density, nvalues, ceiling, intc)
pointer gp # Pointer to graphics stream
real density[nvalues] # Density array
int nvalues # Number of density, intensity values
real ceiling # Max intensity to output
real intc[nvalues] # Calculated intensity values
pointer sp, yint, yreal
int npvals
real factor
begin
call smark (sp)
# Only the lowest 5% of the data values are plotted
npvals = nvalues * 0.05
call salloc (yint, npvals, TY_INT)
call salloc (yreal, npvals, TY_REAL)
# Scale intensity vector to ceiling
factor = ceiling / intc[nvalues]
call amulkr (intc, factor, intc, npvals)
call achtri (intc, Memi[yint], npvals)
call achtir (Memi[yint], Memr[yreal], npvals)
call gascale (gp, density, npvals, 1)
call gascale (gp, Memr[yreal], npvals, 2)
call gsview (gp, 0.2, 0.9, 0.1, 0.4)
call gseti (gp, G_ROUND, YES)
call glabax (gp,
"Expand to see Truncation Errors\n (real=SOLID, integer=DASHED)",
"Density (Lowest 5% only)", "Intensity")
call gseti (gp, G_PLTYPE, GL_SOLID)
call gpline (gp, density, intc, npvals)
call gseti (gp, G_PLTYPE, GL_DASHED)
call gpline (gp, density, Memr[yreal], npvals)
call sfree (sp)
end
# HD_PLOTIT -- Plot residuals of calculated versus known itensity.
procedure hd_plotit (gp, density, intk, intc, nvalues)
pointer gp # Pointer to graphics stream
real density[nvalues] # Density array
real intk[nvalues] # Array of known intensities
real intc[nvalues] # Array of calculated intensities
int nvalues # Number of density, intensity values
pointer sp, resid
begin
call smark (sp)
call salloc (resid, nvalues, TY_REAL)
call asubr (intk, intc, Memr[resid], nvalues)
call gascale (gp, density, nvalues, 1)
call gascale (gp, Memr[resid], nvalues, 2)
call gsview (gp, 0.2, 0.9, 0.6, 0.9)
call gseti (gp, G_ROUND, YES)
call glabax (gp, "Residual Intensity\n (Known - Calculated)",
"Density", "")
call gpline (gp, density, Memr[resid], nvalues)
call sfree (sp)
end
# ST_WLUT -- Generate look up table, using technique of HDTOI.
procedure st_wlut (lut, min, max, scale, cfit)
real lut[ARB] # Look up table of intensities
int min # Minimum raw data value
int max # Maximum raw data value
real scale # Density = raw_value * scale
real cfit[ARB] # Coefficient array for restoring curfit
pointer cv, sp, den, indv, kv
int nvalues, i
extern hd_powerr()
begin
call smark (sp)
nvalues = max - min + 1
call salloc (den, nvalues, TY_REAL)
call salloc (indv, nvalues, TY_REAL)
call salloc (kv, nvalues, TY_REAL)
do i = 1, nvalues
Memr[kv+i-1] = real (i)
call amulkr (Memr[kv], scale, Memr[den], nvalues)
call cvrestore (cv, cfit)
call cvuserfnc (cv, hd_powerr)
call hd_aptrans (Memr[den], Memr[indv], nvalues, "logo")
call cvvector (cv, Memr[indv], lut, nvalues)
do i = 1, nvalues
lut[i] = 10.0 ** lut[i]
call cvfree (cv)
call sfree (sp)
end
# ST_TRANSFORM -- Apply transformation from look up table to input vector.
procedure st_transform (min, max, lut, nvalues, intc)
int min # Minimum raw data value
int max # Maximum raw data value
real lut[ARB] # Array of intensity values
int nvalues # Number of density, intensity values
real intc[ARB] # Calculated intensities - returned
int i
begin
do i = 1, nvalues
intc[i] = lut[i]
end
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