GDL to XDL Porting Status

This document tracks which functions and procedures from GDL have been ported to XDL.

Summary Statistics

GDL Total Functions/Procedures: ~450+ XDL Implemented: ~70 Completion: ~15%

✅ Already Implemented in XDL

Math Functions (15)

  • SIN, COS, TAN
  • ASIN, ACOS, ATAN
  • EXP, ALOG/LN, ALOG10
  • SQRT, ABS, FLOOR, CEIL, ROUND
  • FFT

Array Generation (3)

  • FINDGEN, INDGEN, RANDOMU

Array Creation (6)

  • BYTARR, INTARR, LONARR, FLTARR, DBLARR, STRARR

Array Manipulation (10)

  • N_ELEMENTS, WHERE, REFORM, TRANSPOSE
  • MIN, MAX, MEAN, TOTAL, REVERSE, SORT

Array Processing (5)

  • SMOOTH, MOVING_AVERAGE, WMA, EMA, CUMULATIVE_AVERAGE

Statistics (9)

  • VARIANCE, STDDEV, MEDIAN, MOMENT
  • MEANABSDEV, SKEWNESS, KURTOSIS
  • GAUSS_PDF, T_PDF, CHISQR_PDF

String Functions (6)

  • STRLEN, STRPOS, STRMID, STRUPCASE, STRLOWCASE, STRING

I/O Functions (9)

  • PRINT, GET_LUN, FILEPATH, READ_JPEG, READF
  • FREE_LUN, OPENR, OPENW, OPENU, CLOSE

I/O Procedures (2)

  • PRINTF, WRITEF

Graphics Procedures (11)

  • PLOT, OPLOT, CONTOUR, SURFACE
  • WINDOW, WSET, ERASE, DEVICE
  • LOADCT, TVSCL, AXIS

System Procedures (8)

  • HELP, CD, SPAWN, CALL_PROCEDURE
  • DEFSYSV, @, .COMPILE, .CONTINUE, CATCH

Python Integration (3)

  • PYTHON_IMPORT, PYTHON_CALL, PYTHON_CALL_KW

Machine Learning (7)

  • XDLML_PARTITION, XDLML_SHUFFLE
  • XDLML_LINEAR_NORMALIZER, XDLML_RANGE_NORMALIZER
  • XDLML_VARIANCE_NORMALIZER, XDLML_TANH_NORMALIZER
  • XDLML_UNIT_NORMALIZER, XDLML_KMEANS

Data Structures (1)

  • HASH

🔴 High Priority - Core Functions to Port

Essential Math Functions

  • SINH, COSH, TANH, ASINH, ACOSH, ATANH
  • ALOG2 (log base 2)
  • GAMMA, LNGAMMA, IGAMMA, BETA, IBETA
  • BESELJ, BESELY, BESELI, BESELK (Bessel functions)
  • ERF, ERFC, ERROREF (error functions)
  • LEGENDRE, LAGUERRE, SPHER_HARM (special functions)
  • VOIGT

Type Conversion (Critical)

  • BYTE, FIX, LONG, LONG64, FLOAT, DOUBLE
  • UINT, ULONG, ULONG64, COMPLEX, DCOMPLEX
  • STRING (full version)
  • TYPENAME

Array Generation

  • BINDGEN, LINDGEN, SINDGEN, DINDGEN
  • UINDGEN, ULINDGEN, L64INDGEN, UL64INDGEN
  • CINDGEN, DCINDGEN
  • COMPLEXARR, DCOMPLEXARR, UINTARR
  • LON64ARR, ULON64ARR, ULONDARR, OBJARR, PTRARR
  • RANDOMN (Gaussian random)
  • MAKE_ARRAY

Critical Array Manipulation

  • SIZE (very important!)
  • ROTATE, SHIFT, REBIN
  • REPLICATE, REPLICATE_INPLACE
  • ARRAY_EQUAL
  • FINITE (check for NaN/Inf)
  • HISTOGRAM

Matrix Operations

  • MATRIX_MULTIPLY (##)
  • TRANSPOSE (already have)
  • INVERT
  • DETERM
  • LUDC, LUSOL
  • SVDC (SVD decomposition)
  • CHOLDC, CHOLSOL
  • ELMHES, HQR, TRIRED, TRIQL
  • LA_CHOLDC, LA_CHOLSOL, LA_ELMHES, LA_TRIRED, LA_LEAST_SQUARES

String Functions (Extended)

  • STRCMP, STRCOMPRESS, STREGEX
  • STRJOIN, STRSPLIT, STRTOK
  • STRTRIM, STRPUT
  • FULSTR (not common, low priority)

I/O Functions (Critical)

  • READ, READU, READS
  • EOF, FSTAT
  • POINT_LUN, SKIP_LUN, TRUNCATE_LUN
  • COPY_LUN
  • ASSOC (binary file access)

File Operations

  • FILE_SEARCH, FINDFILE
  • FILE_TEST, FILE_INFO
  • FILE_BASENAME, FILE_DIRNAME, FILE_EXPAND_PATH
  • FILE_LINES
  • FILE_COPY, FILE_DELETE, FILE_MOVE, FILE_MKDIR
  • FILE_LINK, FILE_READLINK, FILE_SAME

Date/Time

  • SYSTIME
  • JULDAY, CALDAT
  • TIMESTAMP, TIMESTAMPTOVALUES

System Functions

  • GETENV, SETENV
  • MEMORY
  • COMMAND_LINE_ARGS
  • ROUTINE_INFO, ROUTINE_NAMES, ROUTINE_DIR, ROUTINE_FILEPATH
  • RESOLVE_ROUTINE
  • SCOPE_LEVEL, SCOPE_VARFETCH, SCOPE_TRACEBACK, SCOPE_VARNAME
  • ARG_PRESENT, N_PARAMS
  • KEYWORD_SET

Image Processing

  • CONVOL (convolution)
  • DILATE_INTERNALGDL, ERODE_INTERNALGDL
  • ROBERTS, SOBEL, PREWITT
  • RADON
  • POLY_2D
  • LABEL_REGION

Interpolation & Fitting

  • INTERPOL, INTERPOLATE
  • SPL_INIT, SPL_INTERP
  • VALUE_LOCATE
  • GAUSSFIT
  • TRIANGULATE, TRIGRID, QGRID3

Optimization & Root Finding

  • NEWTON, FX_ROOT, FZ_ROOTS
  • AMOEBA, POWELL, DFPMIN
  • BROYDEN
  • SIMPLEX (linear programming)
  • LINBCG (linear systems)

Numerical Integration

  • QSIMP, QROMB, QROMO
  • GAUSSINT
  • RK4 (Runge-Kutta)

Structures & Objects

  • CREATE_STRUCT, STRUCT_ASSIGN
  • TAG_NAMES, N_TAGS
  • OBJ_NEW, OBJ_VALID, OBJ_DESTROY
  • OBJ_CLASS, OBJ_ISA, OBJ_HASMETHOD
  • PTR_NEW, PTR_VALID, PTR_FREE
  • HEAP_FREE, HEAP_GC, HEAP_REFCOUNT

Data Collections

  • LIST (already have HASH)
  • ORDEREDHASH

🟡 Medium Priority - Nice to Have

Graphics (2D)

  • PLOTS, POLYFILL, XYOUTS
  • PLOT_IO, PLOT_OI, PLOT_OO
  • USERSYM
  • TV, TVRD, TVCRS

Graphics (3D)

  • SHADE_SURF, SCALE3, T3D

Color Management

  • TVLCT
  • CURSOR

Widget System (if GUI is planned)

  • WIDGET_BASE, WIDGET_BUTTON, WIDGET_TEXT, etc.
  • WIDGET_EVENT, WIDGET_INFO, WIDGET_CONTROL
  • WDELETE, WSHOW, WINDOW (graphical)

File Format I/O

  • HDF5 functions (H5*)
  • HDF4 functions (HDF_*)
  • NetCDF functions (NCDF_*)
  • TIFF functions (TIFF_*)
  • GRIB functions (GRIBAPI_*)

External Libraries

  • CALL_EXTERNAL
  • LINKIMAGE, UNLINKIMAGE, UNLINKSYMBOL
  • DLM_LOAD

Advanced Features

  • CATCH (exception handling)
  • ON_ERROR
  • MESSAGE
  • JOURNAL, RECALL_COMMANDS

🟢 Low Priority - Specialized/Legacy

Parallel/MPI

  • MPIDL_* functions (if MPI support needed)

Semaphores/Shared Memory

  • SEM_CREATE, SEM_DELETE, SEM_LOCK, SEM_RELEASE
  • SHMMAP, SHMUNMAP, SHMVAR, SHMDEBUG

GMEM (Process Management)

  • GMEM_* functions

Obsolete/Platform-Specific

  • CHECK_MATH
  • MACHAR
  • CDF_EPOCH
  • Various *_EXISTS functions (feature detection)

Rarely Used

  • SPRSAB, SPRSAX, SPRSIN, SPRSTP (sparse matrices)
  • WTN (wavelet transform)
  • HANNING (window function)
  • CROSSP (cross product)
  • FULSTR
  • PM (process management)

📊 Recommended Implementation Order

Phase 1: Core Language Features (High Impact)

  1. Type system - All type conversion functions (BYTE, FIX, LONG, etc.)
  2. SIZE function - Critically important for array introspection
  3. Array generation - Complete the *INDGEN family
  4. FINITE - NaN/Inf handling
  5. Basic string operations - STRCMP, STRJOIN, STRTRIM

Phase 2: Essential I/O

  1. READ/READU/READS - File input
  2. File operations - FILE_TEST, FILE_INFO, FILE_SEARCH
  3. ASSOC - Direct access files
  4. EOF, FSTAT - File status

Phase 3: Core Math/Science

  1. Hyperbolic functions - SINH, COSH, TANH
  2. Special functions - GAMMA, BETA, ERF, Bessel functions
  3. Linear algebra - INVERT, LUDC, SVDC
  4. Interpolation - INTERPOL, SPL_INIT/SPL_INTERP

Phase 4: Advanced Arrays

  1. HISTOGRAM
  2. ROTATE, SHIFT, REBIN
  3. REPLICATE
  4. CONVOL

Phase 5: System Integration

  1. Structures - CREATE_STRUCT, TAG_NAMES
  2. Objects - OBJ_NEW, PTR_NEW
  3. Introspection - ROUTINE_INFO, SCOPE_*
  4. Environment - GETENV, SETENV

Phase 6: Specialized (As Needed)

  1. File formats (HDF5, NetCDF, etc.)
  2. Advanced graphics
  3. Widgets (if GUI planned)
  4. Parallel computing support

🎯 Quick Wins (Easy to Implement, High Value)

These are simple but commonly used functions:

  1. FINITE - Check for NaN/Inf (trivial)
  2. ISHFT - Bit shift (one-liner)
  3. SIGNUM - Sign function (one-liner)
  4. LOGICAL_AND/OR/TRUE - Boolean ops (simple)
  5. EMPTY - Check if undefined (simple)
  6. ISA - Type checking (moderate)
  7. KEYWORD_SET - Check keyword (simple with keyword system)

Notes

  • Functions marked with _INTERNALGDL are GDL-specific extensions
  • Many *_EXISTS functions check for optional library support
  • Widget functions are lower priority unless GUI is a core goal
  • File format I/O depends on external library availability
  • MPI/parallel functions only needed if parallel computing is a goal

Recommendation: Focus on Phase 1-3 first. These provide 80% of typical scientific computing needs.