IDL/GDL Command Implementation Status in XDL

This document tracks which IDL/GDL commands are implemented in XDL.

Last Updated: 2025-10-25

Legend

✅ Fully implemented
🟡 Partially implemented / Placeholder
❌ Not implemented

📊 ARRAY MANIPULATION

✅ Implemented (Array Manipulation)

✅ BYTARR - Create byte array
✅ INTARR - Create integer array
✅ LONARR - Create long integer array
✅ FLTARR - Create float array
✅ DBLARR - Create double array
✅ STRARR - Create string array
✅ REFORM - Reshape arrays
✅ TRANSPOSE - Array transpose
✅ ROTATE - Rotate arrays
✅ SHIFT - Circular shift
✅ REBIN - Resize by resampling
✅ REPLICATE - Replicate values
✅ REVERSE - Reverse array
✅ SORT - Sort array
✅ N_ELEMENTS - Number of elements
✅ WHERE - Find indices matching condition
✅ HISTOGRAM - Compute histogram
✅ MIN - Minimum value
✅ MAX - Maximum value
✅ MEAN - Average
✅ TOTAL - Sum of elements
✅ MESHGRID - Create coordinate grids
✅ UNIQ - Find unique elements in sorted array
✅ ARRAY_INDICES - Convert 1D to N-D indices
✅ ARRAY_EQUAL - Test array equality
✅ PERMUTE - Permute array dimensions
✅ CONGRID - Resize with interpolation
✅ INTERPOL - 1D interpolation

🔢 MATHEMATICS

✅ Implemented (Mathematics)

Basic Math:

✅ ABS - Absolute value
✅ FLOOR - Round down
✅ CEIL - Round up
✅ ROUND - Round to nearest
✅ SQRT - Square root
✅ EXP - Exponential
✅ ALOG/LN - Natural log
✅ ALOG10 - Base 10 log

Trigonometry:

✅ SIN, COS, TAN - Trig functions
✅ ASIN, ACOS, ATAN - Inverse trig
✅ ATAN2 - Two-argument arctangent
✅ SINH, COSH, TANH - Hyperbolic trig

Other:

✅ NCHOOSEK - Binomial coefficient

Special Functions:

✅ GAMMA - Gamma function
✅ LNGAMMA - Log gamma
✅ ERF - Error function
✅ ERFC - Complementary error function
✅ BESSEL_J - Bessel function (first kind)
✅ FACTORIAL - Factorial
✅ ASINH, ACOSH, ATANH - Inverse hyperbolic functions
✅ BETA - Beta function
✅ GCD - Greatest common divisor
✅ LCM - Least common multiple
✅ POLY - Polynomial evaluation
✅ BINOMIAL - Binomial coefficient

❌ Not Yet Implemented (Mathematics)

❌ BESSEL_Y, BESSEL_I, BESSEL_K - Other Bessel functions
❌ EXPINT - Exponential integral
❌ PRIME - Prime number generation
❌ POLY_FIT - Polynomial fitting

📈 STATISTICS

✅ Implemented (Statistics)

✅ VARIANCE - Variance
✅ STDDEV - Standard deviation
✅ MEDIAN - Median value
✅ MOMENT - Statistical moments
✅ MEANABSDEV - Mean absolute deviation
✅ SKEWNESS - Skewness
✅ KURTOSIS - Kurtosis
✅ GAUSS_PDF - Gaussian PDF
✅ T_PDF - Student’s t PDF
✅ CHISQR_PDF - Chi-square PDF
✅ CORRELATE - Pearson correlation coefficient
✅ REGRESS - Linear regression (simple & multiple)
✅ LINFIT - Linear least-squares fit
✅ PERCENTILES - Percentile calculation
✅ ROBUST_MEAN - Robust mean using sigma clipping
✅ RESISTANT_MEAN - Resistant mean using MAD
✅ TRIMMED_MEAN - Trimmed mean
✅ RANDOMN - Normal/Gaussian random numbers
✅ RANDOM_POISSON - Poisson random numbers

❌ Not Yet Implemented (Statistics)

❌ C_CORRELATE - Cross-correlation
❌ A_CORRELATE - Auto-correlation
❌ R_CORRELATE - Rank correlation
❌ CURVEFIT - Non-linear curve fitting
❌ POLY_FIT - Polynomial fitting
❌ SVDFIT - SVD fitting
❌ LADFIT - Least absolute deviation fit

🎨 GRAPHICS & PLOTTING

✅ Implemented (Graphics & Plotting)

2D Plotting:

✅ PLOT - Line plots
✅ OPLOT - Overplot
✅ PLOTS - Plot points
✅ XYOUTS - Text annotation
✅ AXIS - Draw axis
✅ POLYFILL - Filled polygon
✅ ARROW - Draw arrow
✅ USERSYM - User symbols
✅ BAR_PLOT - Bar chart
✅ HISTOGRAM - Histogram plot
✅ PLOTERR - Error bars
✅ ERRPLOT - Error plot

3D Plotting:

✅ SURFACE - 3D surface
✅ CONTOUR - Contour plot
✅ SHADE_SURF - Shaded surface
✅ SHADE_SURF_IRR - Irregular shaded surface
✅ PLOT3D - 3D line plot
✅ ISOCONTOUR - Iso-contour
✅ ISOSURFACE - Iso-surface

Image Display:

✅ TV - Display image
✅ TVSCL - Scaled image display
✅ TVCRS - Cursor positioning
✅ IMAGE_DISPLAY - Enhanced image display

Window Management:

✅ WINDOW - Create window
✅ WSET - Set active window
✅ WDELETE - Delete window
✅ WSHOW - Show/hide window
✅ ERASE - Erase window
✅ EMPTY - Empty graphics buffer

Device & Color:

✅ DEVICE - Device control
✅ LOADCT - Load color table

Interactive:

✅ CURSOR - Read cursor position

Maps:

✅ MAP_SET - Set up map
✅ MAP_CONTINENTS - Draw continents
✅ MAP_GRID - Draw map grid

Specialized:

✅ VEL - Velocity vectors
✅ VELOVECT - Vector field
✅ QUIVER - Quiver plot
✅ RENDER_COLORMAP - Colormap rendering
✅ DEM_RENDER - Digital elevation model
✅ HILLSHADE - Hillshade rendering

❌ Not Yet Implemented (Graphics & Plotting)

❌ PLOTXY - Advanced XY plotting
❌ PLOTSYM - Plot symbols
❌ XYOUTPS - PostScript text
❌ CONTOUR (advanced modes)
❌ POLAR_CONTOUR - Polar contours
❌ POLAR_SURFACE - Polar surface
❌ SLICER3 - Volume slicer
❌ XVOLUME - Volume rendering widget
❌ XLOADCT - Interactive color table
❌ XPALETTE - Palette editor
❌ TVRD - Read from display
❌ WSET (all modes)
❌ SET_PLOT - Set plot device
❌ GRAPHICS_TIMES - Graphics timing
❌ MAP_PROJ functions (various projections)
❌ MAP_IMAGE - Map image display
❌ STREAMLINE - Streamlines
❌ FLOW3 - 3D flow visualization

🔤 STRING OPERATIONS

✅ Implemented (String Operations)

✅ STRLEN - String length
✅ STRPOS - Find substring
✅ STRMID - Extract substring
✅ STRUPCASE - Convert to uppercase
✅ STRLOWCASE - Convert to lowercase
✅ STRTRIM - Trim whitespace
✅ STRJOIN - Join strings
✅ STRSPLIT - Split string
✅ STRCMP - Compare strings
✅ STRCOMPRESS - Compress whitespace
✅ STRMATCH - Pattern matching
✅ STRING - Convert to string

❌ Not Yet Implemented (String Operations)

❌ STRREPLACE - Replace substring
❌ STRPUT - Put string
❌ STRGET - Get string
❌ STREGEX - Regular expressions
❌ STRSEARCH - Search string
❌ STRCMP (advanced modes)
❌ STRMESSAGE - Error messages
❌ FORMAT_STRING - Format strings
❌ READS/READF - String input

📁 FILE I/O

✅ Implemented (File I/O)

✅ OPENR - Open for reading
✅ OPENW - Open for writing
✅ OPENU - Open for update
✅ CLOSE - Close file
✅ FREE_LUN - Free logical unit
✅ GET_LUN - Get logical unit
✅ PRINTF/WRITEF - Formatted write
✅ READF - Formatted read
✅ READU - Unformatted read
✅ WRITEU - Unformatted write
✅ FILE_TEST - Test file existence
✅ FILE_LINES - Count lines
✅ FILE_INFO - File information
✅ EOF - End of file test
✅ FLUSH - Flush buffer
🟡 POINT_LUN - Position pointer (placeholder)
🟡 ASSOC - Associate array (basic)
✅ FILEPATH - File path construction

❌ Not Yet Implemented (File I/O)

❌ PRINT (full formatting)
❌ READ - Console read
❌ READS - String read
❌ ON_IOERROR - I/O error handler
❌ FILE_BASENAME - Extract basename
❌ FILE_DIRNAME - Extract directory
❌ FILE_EXPAND_PATH - Expand path
❌ FILE_SAME - Compare files
❌ FILE_SEARCH - Search for files
❌ FILE_MKDIR - Create directory
❌ FILE_DELETE - Delete file
❌ FILE_COPY - Copy file
❌ FILE_MOVE - Move file
❌ FILE_CHMOD - Change permissions
❌ FILE_READLINK - Read symlink
❌ FILE_LINK - Create link
❌ FILE_ZIP - Compress file
❌ FILE_UNZIP - Decompress file
❌ FILE_TAR - Tar operations
❌ FINDFILE - Find files

Image I/O

🟡 READ_JPEG - Read JPEG (placeholder)
❌ WRITE_JPEG - Write JPEG
❌ READ_PNG - Read PNG
❌ WRITE_PNG - Write PNG
❌ READ_TIFF - Read TIFF
❌ WRITE_TIFF - Write TIFF
❌ READ_BMP - Read BMP
❌ WRITE_BMP - Write BMP
❌ READ_GIF - Read GIF
❌ WRITE_GIF - Write GIF
❌ READ_PPM - Read PPM
❌ WRITE_PPM - Write PPM

🎲 SIGNAL PROCESSING

✅ Implemented (Signal Processing)

✅ FFT - Fast Fourier Transform
✅ CONVOL - Convolution
✅ SMOOTH - Smoothing
✅ MOVING_AVERAGE - Moving average
✅ WMA - Weighted moving average
✅ EMA - Exponential moving average

❌ Not Yet Implemented (Signal Processing)

❌ FFT (advanced modes, 2D/3D)
❌ CONVOL (advanced modes)
❌ DECONVOL - Deconvolution
❌ DIGITAL_FILTER - Digital filter
❌ FIR_FILTER - FIR filter
❌ IIR_FILTER - IIR filter
❌ BANDPASS_FILTER - Bandpass
❌ BANDSTOP_FILTER - Bandstop
❌ HIGHPASS_FILTER - Highpass
❌ LOWPASS_FILTER - Lowpass
❌ BUTTERWORTH - Butterworth filter
❌ CHEBYSHEV - Chebyshev filter
❌ HILBERT - Hilbert transform
❌ WAVELET - Wavelet transform
❌ MORLET - Morlet wavelet
❌ A_CORRELATE - Auto-correlation
❌ C_CORRELATE - Cross-correlation
❌ CORRELATE2 - 2D correlation
❌ SPEC_GRAM - Spectrogram
❌ POWER_SPECTRUM - Power spectrum
❌ CROSSP - Cross power

🔢 LINEAR ALGEBRA

✅ Implemented (Linear Algebra)

✅ IDENTITY - Identity matrix
✅ INVERT - Matrix inversion
✅ DETERM - Determinant
✅ CROSSP - Cross product
✅ DOTP - Dot product
✅ NORM - Matrix norm
✅ DIAGONAL - Extract diagonal
✅ TRACE - Matrix trace

❌ Not Yet Implemented (Linear Algebra)

❌ SVDC - SVD decomposition
❌ SVDFIT - SVD fitting
❌ LUDC - LU decomposition
❌ LUSOL - LU solve
❌ LA_SVD - LAPACK SVD
❌ LA_EIGENVAL - Eigenvalues
❌ LA_EIGENVEC - Eigenvectors
❌ LA_LINEAR_EQUATION - Linear equations
❌ LA_LEAST_SQUARES - Least squares
❌ LA_CHOLDC - Cholesky decomposition
❌ LA_TRIDC - Tridiagonal decomposition
❌ COND - Condition number

🖼️ IMAGE PROCESSING

✅ Implemented (Image Processing)

✅ CONVOL - Convolution (basic)

❌ Not Yet Implemented (Image Processing)

❌ DILATE - Morphological dilation
❌ ERODE - Morphological erosion
❌ MORPH_OPEN - Morphological opening
❌ MORPH_CLOSE - Morphological closing
❌ MORPH_GRADIENT - Morphological gradient
❌ MORPH_TOPHAT - Top hat transform
❌ MORPH_DISTANCE - Distance transform
❌ SOBEL - Sobel edge detection
❌ ROBERTS - Roberts edge detection
❌ PREWITT - Prewitt edge detection
❌ CANNY - Canny edge detection
❌ HOUGH - Hough transform
❌ RADON - Radon transform
❌ LABEL_REGION - Region labeling
❌ WATERSHED - Watershed segmentation
❌ DIST - Distance transform
❌ SHIFT_DIFF - Shift difference
❌ MEDIAN (filter) - Median filter
❌ ROBERTS - Roberts operator
❌ EMBOSS - Emboss filter
❌ UNSHARP_MASK - Unsharp masking
❌ GAUSSIAN_FILTER - Gaussian filtering
❌ WIENER_FILTER - Wiener filtering
❌ THRESHOLD - Image thresholding

🕐 TIME & DATE

✅ Implemented (Time & Date)

✅ SYSTIME - System time
✅ JULDAY - Julian day
✅ CALDAT - Calendar date

❌ Not Yet Implemented (Time & Date)

❌ BIN_DATE - Binary date
❌ DATE_CONV - Date conversion
❌ DT_STRING - Date/time string
❌ TIMESTAMP - Timestamp
❌ TIMEGEN - Time generation
❌ TIME_TEST1 - Time test
❌ TIME_TEST2 - Time test 2
❌ DAYOFYEAR - Day of year
❌ WEEKDAY - Day of week

🔧 TYPE CONVERSION

✅ Implemented (Type Conversion)

✅ BYTE - Convert to byte
✅ FIX/INT - Convert to integer
✅ LONG - Convert to long
✅ FLOAT/FLT - Convert to float
✅ DOUBLE/DBL - Convert to double
✅ STRING - Convert to string
✅ COMPLEX - Create complex

❌ Not Yet Implemented (Type Conversion)

❌ UINT - Unsigned integer
❌ ULONG - Unsigned long
❌ LONG64 - 64-bit long
❌ ULONG64 - Unsigned 64-bit long
❌ DCOMPLEX - Double complex
❌ PTR_NEW - Create pointer
❌ PTR_VALID - Validate pointer
❌ PTR_FREE - Free pointer
❌ OBJ_NEW - Create object
❌ OBJ_VALID - Validate object
❌ OBJ_DESTROY - Destroy object
❌ OBJ_CLASS - Object class
❌ OBJ_ISA - Object is-a test

💾 DATA STRUCTURES

🟡 Partially Implemented (Data Structures)

🟡 HASH - Hash table (placeholder)

❌ Not Yet Implemented (Data Structures)

❌ LIST - List structure
❌ ORDEREDHASH - Ordered hash
❌ DICTIONARY - Dictionary
❌ STRUCT - Structure creation
❌ CREATE_STRUCT - Create structure
❌ TAG_NAMES - Structure tag names
❌ N_TAGS - Number of tags
❌ SIZE - Variable size/type info
❌ N_PARAMS - Number of parameters

🔄 COMPLEX NUMBERS

✅ Implemented (Complex Numbers)

✅ COMPLEX - Create complex
✅ REAL - Real part
✅ IMAGINARY/IMAG - Imaginary part
✅ CONJ - Complex conjugate

❌ Not Yet Implemented (Complex Numbers)

❌ DCOMPLEX - Double complex
❌ COMPLEXARR - Complex array
❌ DCOMPLEXARR - Double complex array

🖥️ SYSTEM & CONTROL

✅ Implemented (System & Control)

✅ HELP - Help system
✅ CD - Change directory
✅ SPAWN - Spawn process
✅ WAIT - Wait/sleep
🟡 CATCH - Error handling (placeholder)
🟡 CALL_PROCEDURE - Call procedure (placeholder)
🟡 DEFSYSV - Define system variable (placeholder)

❌ Not Yet Implemented (System & Control)

❌ MESSAGE - Display message
❌ ON_ERROR - Error handling
❌ STOP - Stop execution
❌ CONTINUE - Continue execution
❌ RETALL - Return all levels
❌ RETURN - Return from routine
❌ BREAK - Break from loop
❌ HEAP_GC - Garbage collection
❌ MEMORY - Memory status
❌ EXIT - Exit IDL
❌ RESOLVE_ROUTINE - Resolve routine
❌ RESOLVE_ALL - Resolve all
❌ CALL_FUNCTION - Call function
❌ CALL_METHOD - Call method
❌ EXECUTE - Execute string
❌ ROUTINE_INFO - Routine information
❌ SCOPE_VARFETCH - Fetch variable
❌ SCOPE_VARNAME - Variable name
❌ SCOPE_LEVEL - Scope level
❌ SCOPE_TRACEBACK - Stack trace

🤖 MACHINE LEARNING (XDL Extensions)

✅ Fully Implemented

Data Preprocessing:

✅ XDLML_PARTITION
✅ XDLML_SHUFFLE
✅ XDLML_LINEAR_NORMALIZER
✅ XDLML_RANGE_NORMALIZER
✅ XDLML_VARIANCE_NORMALIZER
✅ XDLML_TANH_NORMALIZER
✅ XDLML_UNIT_NORMALIZER
✅ XDLML_KMEANS

Activation Functions:

✅ 18 activation functions (IDENTITY, RELU, TANH, SOFTMAX, etc.)

Loss Functions:

✅ 5 loss functions (MSE, MAE, Cross-Entropy, Huber, LogCosh)

Optimizers:

✅ 5 optimizers (GD, Momentum, RMSProp, Adam, QuickProp)

Models:

✅ Neural Networks (Feedforward, Autoencoder)
✅ SVM (Classification, Regression)
✅ Cross-validation utilities
✅ Regularization layers
✅ Convolutional layers
✅ Recurrent layers (RNN, LSTM)

📊 SUMMARY STATISTICS

Total Commands Tracked: ~400+

✅ Fully Implemented: ~140 commands 🟡 Partially Implemented: ~10 commands ❌ Not Implemented: ~250+ commands

🎯 PRIORITY RECOMMENDATIONS

High Priority (Core Scientific Computing)

Linear Algebra (INVERT, DETERM, LA_* functions)
Advanced Statistics (CORRELATE, REGRESS, CURVEFIT)
Image Processing (DILATE, ERODE, edge detection)
Interpolation (INTERPOL, CONGRID)
Special Functions (BESSEL, GAMMA, ERF)

Medium Priority (Enhanced Functionality)

Advanced FFT modes (2D/3D)
String regex (STREGEX)
File operations (FILE_SEARCH, FILE_DELETE, etc.)
Data structures (LIST, proper STRUCT)
More plotting options

Low Priority (Nice to Have)

Widget system
Object-oriented features
Advanced graphics modes
Specialized map projections
Parallel processing

📝 NOTES

XDL includes extensive ML functionality not in standard IDL
Python integration provides access to additional libraries
Modern visualization via ECharts and Three.js
Focus has been on core scientific array processing
Graphics implementation uses web-based rendering

For detailed implementation status of specific functions, see the source code in /xdl-stdlib/src/