January 15, 2012

News for version 6 5 4.4 4.2 4 3.8 3.6 3.4 3.2 3 2 1 (Release History)

** The PCRE library is now required to build Octave. If a pre-compiled package does not exist for your system, you can find PCRE sources at http://www.pcre.org ** The ARPACK library is no longer distributed with Octave. If you need the eigs or svds functions you must provide an external ARPACK through a package manager or by compiling it yourself. If a pre-compiled package does not exist for your system, you can find the current ARPACK sources at http://forge.scilab.org/index.php/p/arpack-ng ** Many of Octave's binary operators (.*, .^, +, -, ...) now perform automatic broadcasting for array operations which allows you to use operator notation instead of calling bsxfun or expanding arrays (and unnecessarily wasting memory) with repmat or similar idioms. For example, to scale the columns of a matrix by the elements of a row vector, you may now write rv .* M In this expression, the number of elements of rv must match the number of columns of M. The following operators are affected: plus + .+ minus - .- times .* rdivide ./ ldivide .\ power .^ .** lt < le <= eq == gt > ge >= ne != ~= and & or | atan2 hypot max min mod rem xor additionally, since the A op= B assignment operators are equivalent to A = A op B, the following operators are also affected: += -= .+= .-= .*= ./= .\= .^= .**= &= |= See the "Broadcasting" section in the new "Vectorization and Faster Code Execution" chapter of the manual for more details. ** Octave now features a profiler, thanks to the work of Daniel Kraft under the Google Summer of Code mentorship program. The manual has been updated to reflect this addition. The new user-visible functions are profile, profshow, and profexplore. ** Overhaul of statistical distribution functions Functions now return "single" outputs for inputs of class "single". 75% reduction in memory usage through use of logical indexing. Random sample functions now use the same syntax as rand and accept a comma separated list of dimensions or a dimension vector. Functions have been made Matlab-compatible with regard to special cases (probability on boundaries, probabilities for values outside distribution, etc.). This may cause subtle changes to existing scripts. negative binomial function has been extended to real, non-integer inputs. The discrete_inv function now returns v(1) for 0 instead of NaN. The nbincdf function has been recoded to use a closed form solution with betainc. ** strread, textscan, and textread have been completely revamped. They now support nearly all Matlab functionality including: * Matlab-compatible whitespace and delimiter defaults * Matlab-compatible options: 'whitespace', treatasempty', format string repeat count, user-specified comment style, uneven-length output arrays, %n and %u conversion specifiers (provisionally) ** All .m string functions have been modified for better performance or greater Matlab compatibility. Performance gains of 15X-30X have been demonstrated. Operations on cell array of strings no longer pay quite as high a penalty as those on 2-D character arrays. deblank: Now requires character or cellstr input. strtrim: Now requires character or cellstr input. No longer trims nulls ("\0") from string for Matlab compatibility. strmatch: Follows documentation precisely and ignores trailing spaces in pattern and in string. Note that this is documented Matlab behavior but the implementation apparently does not always follow it. substr: Now possible to specify a negative LEN option which extracts to within LEN of the end of the string. strtok: Now accepts cellstr input. base2dec, bin2dec, hex2dec: Now accept cellstr inputs. dec2base, dec2bin, dec2hex: Now accept cellstr inputs. index, rindex: Now accept 2-D character array input. strsplit: Now accepts 2-D character array input. ** Geometry functions derived from Qhull (convhull, delaunay, voronoi) have been revamped. The options passed to the underlying qhull command have been changed for better results or for Matlab compatibility. convhull: Default options are "Qt" for 2D, 3D, 4D inputs Default options are "Qt Qx" for 5D and higher delaunay: Default options are "Qt Qbb Qc Qz" for 2D and 3D inputs Default options are "Qt Qbb Qc Qx" for 4D and higher voronoi: No default arguments ** Date/Time functions updated. Millisecond support with FFF format string now supported. datestr: Numerical formats 21, 22, 29 changed to match Matlab. Now accepts cellstr input. ** The following warning IDs have been removed: Octave:associativity-change Octave:complex-cmp-ops Octave:empty-list-elements Octave:fortran-indexing Octave:precedence-change ** The warning ID Octave:string-concat has been renamed to Octave:mixed-string-concat. ** Octave now includes the following Matlab-compatible preference functions: addpref getpref ispref rmpref setpref ** The following Matlab-compatible handle graphics functions have been added: guidata uipanel uitoolbar guihandles uipushtool uiwait uicontextmenu uiresume waitfor uicontrol uitoggletool The uiXXX functions above are experimental. Except for uiwait and uiresume, the uiXXX functions are not supported with the FLTK+OpenGL graphics toolkit. The gnuplot graphics toolkit does not support any of the uiXXX functions nor the waitfor function. ** New keyword parfor (parallel for loop) is now recognized as a valid keyword. Implementation, however, is still mapped to an ordinary for loop. ** Other new functions added in 3.6.0: bicg nthargout usejava is_dq_string narginchk waitbar is_sq_string python zscore is_function_handle register_graphics_toolkit loaded_graphics_toolkits recycle ** Deprecated functions. The following functions were deprecated in Octave 3.2 and have been removed from Octave 3.6. create_set spcholinv splu dmult spcumprod spmax iscommand spcumsum spmin israwcommand spdet spprod lchol spdiag spqr loadimage spfind spsum mark_as_command sphcat spsumsq mark_as_rawcommand spinv spvcat spatan2 spkron str2mat spchol splchol unmark_command spchol2inv split unmark_rawcommand The following functions have been deprecated in Octave 3.6 and will be removed from Octave 3.10 (or whatever version is the second major release after 3.6): cut is_duplicate_entry cor polyderiv corrcoef shell_cmd __error_text__ studentize error_text sylvester_matrix