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Sherpa Reference Manual
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Sherpa Reference Manual
Contents
List of Tables
1. Sherpa Commands
1.1 Summary of Commands
1.2 Description Conventions
1.3 Running Sherpa
1.4 $
1.5 # | %
1.6 ANALYSIS
1.7 BACK
1.7.1 Using Data Model Filters
1.8 BACKERRORS | BERRORS
1.9 BACKGROUND | BG
1.10 BDCOUNTS
1.11 BEFLUX
1.12 BGROUP
1.13 BMCOUNTS
1.14 BSTATERRORS
1.15 BSYSERRORS
1.16 BUNGROUP
1.17 BYE | EXIT | QUIT
1.18 CAST
1.19 CLOSE
1.20 COORD
1.21 COVARIANCE
1.21.1 Caveats
1.21.2 CHANGES IN CIAO 3.2
1.22 CPLOT
1.23 CREATE
1.24 DATA
1.24.1 Using Data Model Filters
1.25 DATASPACE
1.26 ECHO
1.27 EFLUX
1.28 EQWIDTH
1.29 ERASE
1.30 ERRORS
1.31 EXIT | BYE | QUIT
1.32 FAKEIT
1.33 FEFFILE
1.34 FEFPLOT
1.35 FIT | RUN
1.36 FLUX
1.37 FREEZE
1.38 FTEST
1.39 GETX
1.40 GETY
1.41 GOODNESS
1.42 GROUP
1.43 GUESS
1.44 IGNORE
1.45 IMAGE
1.45.1 Using Data Model Filters
1.46 INSTRUMENT | RESPONSE
1.47 INTEGRATE
1.47.1 Why do the model units change when integrate is turned on/off?
1.48 INTERVAL-PROJECTION | INT-PROJ
1.48.1 CHANGES IN CIAO 3.2
1.49 INTERVAL-UNCERTAINTY | INT-UNC
1.49.1 CHANGES IN CIAO 3.2
1.50 JOURNAL
1.51 LPLOT
1.52 MCOUNTS
1.53 METHOD | SEARCHMETHOD
1.54 MLR
1.55 NOTICE
1.56 OPEN
1.57 OPLOT
1.58 PARAMPROMPT
1.59 PLOTX
1.60 PLOTY
1.60.1 RATE vs. COUNTS
1.61 PROJECTION
1.61.1 Caveats
1.61.2 CHANGES IN CIAO 3.2
1.62 PROMPT
1.63 QUIT | BYE | EXIT
1.64 READ
1.64.1 ASCII File Type:
1.64.2 FITS, FITSIMAGE, IMH, and QP File Types:
1.64.3 FITSBIN (FITS Binary Table) File Type:
1.64.4 PHA File Types (Types I and II):
1.64.5 Using Data Model Filters
1.65 RECORD
1.66 REGION-PROJECTION | REG-PROJ
1.66.1 CHANGES IN CIAO 3.2
1.67 REGION-UNCERTAINTY | REG-UNC
1.67.1 CHANGES IN CIAO 3.2
1.68 RENAME
1.69 RESET
1.70 RESPONSE | INSTRUMENT
1.71 RUN | FIT
1.72 SAVE
1.73 SEARCHMETHOD | METHOD
1.74 SETBACK
1.75 SETDATA
1.76 SHOW
1.77 SOURCE | SRC
1.78 SPLOT
1.79 STATISTIC
1.80 SUBTRACT
1.81 STATERRORS
1.82 SYSERRORS
1.83 THAW
1.84 TRUNCATE
1.85 UNCERTAINTY
1.85.1 Caveats
1.85.2 CHANGES IN CIAO 3.2
1.86 UNGROUP
1.87 UNLINK
1.88 UNSUBTRACT
1.89 USE
1.90 VERSION
1.91 WRITE
1.91.1 Using Data Model Filters
1.92 XSPEC ABUNDAN
1.93 XSPEC XSECT
2. Sherpa Display
2.1 Introduction
2.2 1-D Plotting
2.2.1 1-D Plot Controls
2.2.2 Sherpa 1-D Plot Controls
2.2.3 ChIPS 1-D Plot Controls
2.2.4 Interactive Filtering from 1-D Plots
2.2.5 Interactive Assignment of Parameter Values from 1-D Plots
2.2.6 1-D Overplotting
2.3 2-D Imaging
2.3.1 Interactive Filtering from 2-D Images
2.4 2-D Plotting
2.4.1 ChIPS 2-D Plot Controls
3. Sherpa Filtering
3.1 Introduction
3.2 Filtering with IGNORE | NOTICE Commands
3.2.1 Interactive Filtering from a 1-D Plot
3.2.2 Interactive Filtering from a 2-D Image
3.2.3 1-D Filter Expressions - Syntax Option A
3.2.4 1-D Filter Expressions - Syntax Option B
3.2.5 2-D Filter Expressions
3.3 Filtering with an Input Filter File
3.4 Filtering Using Input Data Manipulation Syntax
4. Sherpa Optimization Methods
4.1 Advice on Minimization Methods
4.1.1 Introduction
4.1.2 Single-shot techniques
4.1.3 Scatter-shot techniques
4.1.4 Summary and best-buy strategies
4.2 Summary of Available Optimization Methods
4.3 GRID
4.4 GRID-POWELL
4.5 LEVENBERG-MARQUARDT | LEV-MAR
4.6 MONTECARLO
4.7 MONTE-LM
4.8 MONTE-POWELL
4.9 POWELL
4.10 SIGMA-REJECTION | SIG-REJ
4.11 SIMPLEX
4.12 SIMUL-ANN-1
4.13 SIMUL-ANN-2
4.14 SIMUL-POW-1
4.15 SIMUL-POW-2
4.16 USERMETHOD
5. Sherpa Models
5.1 Introduction
5.2 Source Models
5.2.1 1-D Source Models
5.2.2 2-D Source Models
5.2.3 Multi-dimensional Source Models
5.2.4 Source Model Integration
5.3 Background Models
5.4 Instrument Models
5.4.1 Establishing Model Components
5.4.2 Automatic Estimates of Initial Parameter Values
5.4.3 Setting Model Parameters and Ranges
5.4.4 Setting Model Parameters and Ranges Simultaneously
5.4.5 Establishing Model Components and Setting Parameters Simultaneously
5.4.6 Establishing Model Components, Setting Parameters, & Defining a Source Model Simultaneously
5.4.7 Creating Model Expressions
5.4.8 Creating Model Stacks
5.4.9 Creating Nested Models
5.4.10 Creating Joint-Mode Models
5.4.11 Freezing & Thawing Model Parameters
5.4.12 Linking Model Parameters
5.4.13 Controlling the Integration of Model Components
5.5 Summary of Available Models
5.6 ATTEN
5.7 BBODY | BB
5.8 BBODYFREQ
5.9 BETA1D
5.10 BETA2D | LORPOW2D
5.11 BOX1D
5.12 BOX2D
5.13 BPL1D
5.14 CONST1D | CONST
5.15 CONST2D
5.16 COS
5.17 DELTA1D
5.18 DELTA2D
5.19 DERED
5.20 DEVAUCOULEURS
5.21 EDGE
5.22 ERF
5.23 ERFC
5.24 FARF1D | FARF
5.25 FARF2D | FEXPMAP | FEXPMAP2D
5.26 FPSF1D
5.27 FPSF2D | FPSF | PSFFROMFILE
5.28 FRMF1D | FRMF
5.29 GAUSS1D | GAUSS
5.30 GAUSS2D
5.31 GRIDMODEL
5.32 HIGHPASS | STEPHI1D
5.33 HUBBLE | REYNOLDS
5.34 JDPILEUP
5.35 KERNEL
5.36 LINEBROAD
5.37 LORENTZ1D | LORENTZ
5.38 LORENTZ2D
5.39 LORPOW2D | BETA2D
5.40 LOWPASS | STEPLO1D
5.41 NBETA
5.42 NGAUSS1D
5.43 PILEUP
5.44 POISSON
5.45 POLYNOM1D | POLY
5.46 POLYNOM2D
5.47 POWLAW1D
5.48 PTSRC1D
5.49 PTSRC2D |PTSRC
5.50 REYNOLDS | HUBBLE
5.51 RSP1D |RSP
5.52 RSP2D
5.53 SCHECHTER
5.54 SHEXP10
5.55 SHEXP
5.56 SHLOG10
5.57 SHLOGE | SHLOG
5.58 SIN
5.59 SQRT
5.60 STEPHI1D | HIGHPASS
5.61 STEPLO1D | LOWPASS
5.62 TAN
5.63 TPSF1D
5.64 TPSF2D | TPSF | PSFFROMTCD | PSF
5.65 USERMODEL
5.66 XSxspecname
5.66.1 Important Note:
5.66.2 Unavailable XSPEC Models and Commands
5.66.3 Available XSPEC Models
6. Sherpa Fit Statistics Functions
6.1 Summary of Available Statistics
6.2 BAYES
6.2.1 Note on Background Subtraction
6.3 CASH
6.3.1 Note on Background Subtraction
6.4 statistics
6.4.1 CHI CVAR | CHI PARENT
6.4.2 CHI DVAR
6.4.3 CHI GEHRELS
6.4.4 Note on Background Subtraction
6.4.5 CHI MVAR
6.4.6 Note on Background Subtraction
6.4.7 CHI PARENT | CHI CVAR
6.4.8 CHI PRIMINI
6.4.9 Note on Background Subtraction
6.5 CSTAT
6.5.1 Note on Background Subtraction
6.6 USERSTAT
7. User Models, Statistics, and Methods Within Sherpa
7.1 User Models
7.1.1 Using S-Lang
7.1.2 Using a compiled language and S-Lang
7.1.3 Using a compiled language (the ascfitUserModel interface)
7.2 User Method
7.3 User Statistic
8. S-lang in Sherpa
8.1 compute_errors
8.2 compute_statistic
8.3 create_model
8.4 dcounts
8.5 get
8.6 get_analysis
8.7 get_arf_axes
8.8 get_axes
8.9 get_coord
8.10 get_data
8.11 get_dcounts_sum
8.12 get_defined_models
8.13 get_dir
8.14 get_eflux
8.15 get_energy_axes
8.16 get_eqwidth
8.17 get_errors
8.18 get_filename
8.19 get_filter
8.20 get_filter_expr
8.21 get_fit
8.21.1 CHANGES IN CIAO 3.2
8.22 get_flux2d
8.23 get_flux_str
8.24 get_fluxed_spectrum
8.25 get_ftest
8.26 get_groups
8.27 get_lfactorial
8.28 get_mcounts_sum
8.29 get_metadata
8.30 get_method_expr
8.31 get_model_params
8.32 get_models
8.33 get_num_par
8.34 get_par
8.35 get_paramest
8.35.1 CHANGES IN CIAO 3.1
8.36 get_paramestint
8.36.1 CHANGES IN CIAO 3.1
8.37 get_paramestlim
8.37.1 CHANGES IN CIAO 3.1
8.38 get_paramestreg
8.38.1 CHANGES IN CIAO 3.1
8.39 get_pflux
8.40 get_photon_axes
8.41 get_photon_energy_axes
8.42 get_photon_wave_axes
8.43 get_qvalue
8.44 get_raw_axes
8.45 get_record
8.46 get_source
8.47 get_stackexpr
8.48 get_stat_expr
8.49 get_statistic
8.50 get_stats
8.51 get_syserrors
8.52 get_verbose
8.53 get_wave_axes
8.54 get_weights
8.55 is
8.56 is_paramset
8.57 is_subtracted
8.58 list_par
8.59 list_paramest
8.60 load
8.61 load_arf
8.62 load_ascii
8.63 load_back_from
8.64 load_backset
8.65 load_dataset
8.66 load_fitsbin
8.67 load_image
8.68 load_inst
8.69 load_inst_from
8.70 load_pha
8.71 load_pha2
8.72 load_rmf
8.73 restore_paramest
8.74 run
8.75 run_fit
8.76 run_paramest
8.76.1 CHANGES IN CIAO 3.2
8.76.2 CHANGES IN CIAO 3.1
8.77 run_paramestint
8.77.1 CHANGES IN CIAO 3.2
8.77.2 CHANGES IN CIAO 3.1
8.78 run_paramestlim
8.78.1 CHANGES IN CIAO 3.1
8.79 run_paramestreg
8.79.1 CHANGES IN CIAO 3.2
8.79.2 CHANGES IN CIAO 3.1
8.80 set
8.81 set_analysis
8.82 set_axes
8.83 set_backscale
8.84 set_coord
8.85 set_data
8.86 set_dir
8.87 set_erroff
8.88 set_erron
8.89 set_errors
8.90 set_exptime
8.91 set_filter
8.92 set_groups
8.93 set_ignore
8.94 set_ignore2d
8.95 set_ignore_all
8.96 set_ignore_bad
8.97 set_lin
8.98 set_log
8.99 set_notice
8.100 set_notice2d
8.101 set_notice_all
8.102 set_par
8.103 set_paramset
8.104 set_stackexpr
8.105 set_subtract
8.106 set_syserrors
8.107 set_verbose
8.108 set_weights
Bibliography
cxchelp@head.cfa.harvard.edu