Mercurial > web-octave
diff NEWS-3.8.html @ 94:e8fc61e077fc
Merged closed branch "kai" into default.
author | Kai T. Ohlhus <k.ohlhus@gmail.com> |
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date | Tue, 01 Nov 2016 01:06:10 +0100 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/NEWS-3.8.html Tue Nov 01 01:06:10 2016 +0100 @@ -0,0 +1,400 @@ +<pre> +Summary of important user-visible changes for version 3.8: +--------------------------------------------------------- + + ** One of the biggest new features for Octave 3.8 is a graphical user + interface. It is the one thing that users have requested most + often over the last few years and now it is almost ready. But + because it is not quite as polished as we would like, we have + decided to wait until the 4.0.x release series before making the + GUI the default interface (until then, you can use the --force-gui + option to start the GUI). + + Given the length of time and the number of bug fixes and + improvements since the last major release Octave, we also decided + against delaying the release of all these new improvements any + longer just to perfect the GUI. So please enjoy the 3.8 release of + Octave and the preview of the new GUI. We believe it is working + reasonably well, but we also know that there are some obvious rough + spots and many things that could be improved. + + WE NEED YOUR HELP. There are many ways that you can help us fix + the remaining problems, complete the GUI, and improve the overall + user experience for both novices and experts alike: + + * If you are a skilled software developer, you can help by + contributing your time to help with Octave's development. See + http://octave.org/get-involved.html for more information. + + * If Octave does not work properly, you are encouraged + report the problems you find. See http://octave.org/bugs.html + for more information about how to report problems. + + * Whether you are a user or developer, you can help to fund the + project. Octave development takes a lot of time and expertise. + Your contributions help to ensure that Octave will continue to + improve. See http://octave.org/donate.html for more details. + + We hope you find Octave to be useful. Please help us make it even + better for the future! + + ** Octave now uses OpenGL graphics by default with FLTK widgets. If + OpenGL libraries or FLTK widgets are not available when Octave is + built, gnuplot is used. You may also choose to use gnuplot for + graphics by executing the command + + graphics_toolkit ("gnuplot") + + Adding this command to your ~/.octaverc file will set the default + for each session. + + ** Printing or saving figures with OpenGL graphics requires the + gl2ps library which is no longer distributed with Octave. The + software is widely available in most package managers. If a + pre-compiled package does not exist for your system, you can find + the current sources at http://www.geuz.org/gl2ps/. + + ** Octave now supports nested functions with scoping rules that are + compatible with Matlab. A nested function is one declared and defined + within the body of another function. The nested function is only + accessible from within the enclosing function which makes it one + method for making private functions whose names do not conflict with those + in the global namespace (See also subfunctions and private functions). + In addition, variables in the enclosing function are visible within the + nested function. This makes it possible to have a pseudo-global variable + which can be seen by a group of functions, but which is not visible in + the global namespace. + + Example: + function outerfunc (...) + ... + function nested1 (...) + ... + function nested2 (...) + ... + endfunction + endfunction + + function nested3 (...) + ... + endfunction + endfunction + + ** Line continuations inside character strings have changed. + + The sequence '...' is no longer recognized as a line continuation + inside a character string. A backslash '\' followed by a newline + character is no longer recognized as a line continuation inside + single-quoted character strings. Inside double-quoted character + strings, a backslash followed by a newline character is still + recognized as a line continuation, but the backslash character must + be followed *immediately* by the newline character. No whitespace or + end-of-line comment may appear between them. + + ** Backslash as a continuation marker outside of double-quoted strings + is now deprecated. + + Using '\' as a continuation marker outside of double quoted strings + is now deprecated and will be removed from a future version of + Octave. When that is done, the behavior of + + (a \ + b) + + will be consistent with other binary operators. + + ** Redundant terminal comma accepted by parser + + A redundant terminal comma is now accepted in matrix + definitions which allows writing code such as + + [a,... + b,... + c,... + ] = deal (1,2,3) + + ** Octave now has limited support for named exceptions + + The following syntax is now accepted: + + try + statements + catch exception-id + statements + end + + The exception-id is a structure with the fields "message" and + "identifier". For example + + try + error ("Octave:error-id", "error message"); + catch myerr + printf ("identifier: %s\n", myerr.identifier); + printf ("message: %s\n", myerr.message); + end_try_catch + + When classdef-style classes are added to Octave, the exception-id + will become an MException object. + + ** Warning states may now be set temporarily, until the end of the + current function, using the syntax + + warning STATE ID "local" + + in which STATE may be "on", "off", or "error". Changes to warning + states that are set locally affect the current function and all + functions called from the current scope. The previous warning state + is restored on return from the current function. The "local" + option is ignored if used in the top-level workspace. + + ** Warning IDs renamed: + + Octave:array-as-scalar => Octave:array-to-scalar + Octave:array-as-vector => Octave:array-to-vector + + ** 'emptymatch', 'noemptymatch' options added to regular expressions. + + With this addition Octave now accepts the entire set of Matlab options + for regular expressions. 'noemptymatch' is the default, but 'emptymatch' + has certain uses where you need to match an assertion rather than actual + characters. For example, + + regexprep ('World', '^', 'Hello ', 'emptymatch') + => Hello World + + where the pattern is actually the assertion '^' or start-of-line. + + ** For compatibility with Matlab, the regexp, regexpi, and regexprep + functions now process backslash escape sequences in single-quoted pattern + strings. In addition, the regexprep function now processes backslash + escapes in single-quoted replacement strings. For example, + + regexprep (str, '\t', '\n') + + would search the variable str for a TAB character (escape sequence \t) + and replace it with a NEWLINE (escape sequence \n). Previously the + expression would have searched for a literal '\' followed by 't' and + replaced the two characters with the sequence '\', 'n'. + + ** A TeX parser has been implemented for the FLTK toolkit and is the default + for any text object including titles and axis labels. The TeX parser is + supported only for display on a monitor, not for printing. + + A quick summary of features: + + Code Feature Example Comment + ----------------------------------------------------------------- + _ subscript H_2O formula for water + ^ exponent y=x^2 formula for parabola + \char symbol \beta Greek symbol beta + \fontname font \fontname{Arial} set Arial font + \fontsize fontsize \fontsize{16} set fontsize 16 + \color[rgb] fontcolor \color[rgb]{1 0 1} set magenta color + \bf bold \bfBold Text bold font + \it italic \itItalic Text italic font + \sl slanted \slOblique Text slanted font + \rm normal \bfBold\rmNormal normal font + {} group {\bf Bold}Normal group objects + e^{i*\pi} = -1 group objects + + ** The m-files in the plot directory have been overhauled. + + The plot functions now produce output that is nearly visually compatible + with Matlab. Plot performance has also increased, dramatically for some + functions such as comet and waitbar. Finally, the documentation for most + functions has been updated so it should be clearer both how to use a + function and when a function is appropriate. + + ** The m-files in the image directory have been overhauled. + + The principal benefit is that Octave will now no longer automatically + convert images stored with integers to doubles. Storing images as uint8 + or uint16 requires only 1/8 or 1/4 the memory of an image stored using + doubles. For certain operations, such as fft2, the image must still be + converted to double in order to work. + + Other changes include fixes to the way indexed images are read from a + colormap depending on the image class (integer images have a -1 offset to + the colormap row number). + + ** The imread and imwrite functions have been completely rewritten. + + The main changes relate to the alpha channel, support for reading and + writing of floating point images, implemented writing of indexed images, + and appending images to multipage image files. + + The issues that may arise due to backwards incompatibility are: + + * imwrite no longer interprets a length of 2 or 4 in the third dimension + as grayscale or RGB with alpha channel (a length of 4 will be saved + as a CMYK image). Alpha channel must be passed as separate argument. + + * imread will always return the colormap indexes when reading an indexed + image, even if the colormap is not requested as output. + + * transparency values are now inverted from previous Octave versions + (0 is for completely transparent instead of completely opaque). + + In addition, the function imformats has been implemented to expand + reading and writing of images of different formats through imread + and imwrite. + + ** The colormap function now provides new options--"list", "register", + and "unregister"--to list all available colormap functions, and to + add or remove a function name from the list of known colormap + functions. Packages that implement extra colormaps should use these + commands with PKG_ADD and PKG_DEL statements. + + ** strsplit has been modified to be compatible with Matlab. There + are two instances where backward compatibility is broken. + + (1) Delimiters are now string vectors, not scalars. + + Octave's legacy behavior + + strsplit ("1 2, 3", ", ") + ans = + { + [1,1] = 1 + [1,2] = 2 + [1,3] = + [1,4] = 3 + } + + Matlab compatible behavior + + strsplit ("1 2, 3", ", ") + ans = + { + [1,1] = 1 2 + [1,2] = 3 + } + + (2) By default, Matlab treats consecutive delimiters as a single + delimiter. By default, Octave's legacy behavior was to return an + empty string for the part between the delmiters. + + Where legacy behavior is desired, the call to strsplit() may be + replaced by ostrsplit(), which is Octave's original implementation of + strsplit(). + + ** The datevec function has been extended for better Matlab compatibility. + It now accepts string inputs in the following numerical formats: 12, 21, + 22, 26, 29, 31. This is undocumented, but verifiable, Matlab behavior. + In addition, the default for formats which do not specify a date is + January 1st of the current year. The previous default was the current day, + month, and year. This may produce changes in existing scripts. + + ** The error function and its derivatives has been extended to accept complex + arguments. The following functions now accept complex inputs: + + erf erfc erfcx + + In addition two new error functions erfi (imaginary error function) and + dawson (scaled imaginary error function) have been added. + + ** The glpk function has been modified to reflect changes in the GLPK + library. The "round" and "itcnt" options have been removed. The + "relax" option has been replaced by the "rtest" option. The numeric + values of error codes and of some options have also changed. + + ** The kurtosis function has changed definition to be compatible with + Matlab. It now returns the base kurtosis instead of the "excess kurtosis". + The old behavior can be had by changing scripts to normalize with -3. + + "excess kurtosis" = kurtosis (x) - 3 + + ** The moment function has changed definition to be compatible with + Matlab. It now returns the central moment instead of the raw moment. + The old behavior can be had by passing the type argument "r" for raw. + + ** The default name of the Octave crash dump file is now + "octave-workspace" instead of "octave-core". The exact name can + always be customized with the octave_core_file_name function. + + ** A citation command has been added to display information on how to + cite Octave and packages in publications. The package system will + look for and install CITATION files from packages. + + ** The java package from Octave Forge is now part of core Octave. The + following new functions are available for interacting with Java + directly from Octave: + + debug_java java_matrix_autoconversion + isjava java_unsigned_autoconversion + java2mat javaaddpath + javaArray javaclasspath + javaMethod javamem + javaObject javarmpath + usejava + + In addition, the following functions that use the Java interface + are now available (provided that Octave is compiled with support for + Java enabled): + + helpdlg listdlg questdlg + inputdlg msgbox warndlg + + ** Other new functions added in 3.8.0: + + atan2d erfi lines + base64_decode expint linsolve + base64_encode findfigs missing_component_hook + betaincinv flintmax polyeig + built_in_docstrings_file fminsearch prefdir + cmpermute gallery preferences + cmunique gco readline_re_read_init_file + colorcube hdl2struct readline_read_init_file + copyobj history_save rgbplot + dawson imformats save_default_options + dblist importdata shrinkfaces + desktop isaxes splinefit + doc_cache_create iscolormap stemleaf + ellipj isequaln strjoin + ellipke jit_debug struct2hdl + erfcinv jit_enable tetramesh + jit_startcnt waterfall + + ** Deprecated functions. + + The following functions were deprecated in Octave 3.4 and have been + removed from Octave 3.8. + + autocor dispatch is_global setstr + autocov fstat krylovb strerror + betai gammai perror values + cellidx glpkmex replot + cquad is_duplicate_entry saveimage + + The following functions have been deprecated in Octave 3.8 and will + be removed from Octave 3.12 (or whatever version is the second major + release after 3.8): + + default_save_options java_new + gen_doc_cache java_set + interp1q java_unsigned_conversion + isequalwithequalnans javafields + java_convert_matrix javamethods + java_debug re_read_readline_init_file + java_get read_readline_init_file + java_invoke saving_history + + + The following keywords have been deprecated in Octave 3.8 and will + be removed from Octave 3.12 (or whatever version is the second major + release after 3.8): + + static + + The following configuration variables have been deprecated in Octave + 3.8 and will be removed from Octave 3.12 (or whatever version is the + second major release after 3.8): + + CC_VERSION (now GCC_VERSION) + CXX_VERSION (now GXX_VERSION) + + The internal class Octave_map has been deprecated in Octave 3.8 and + will be removed from Octave 3.12 (or whatever version is the second + major release after 3.8). Replacement classes are octave_map + (struct array) or octave_scalar_map for a single structure. +</pre>