Changes from Version 2.0 to Version 2.1

Note that the programme's name has been changed to SM, that the default directory name is now `sm', and that the `.smongo' file is now called `.sm'.

Changes to do with making SM:

*: Compilation options are now in a file src/options.h rather than in the Makefiles.
*: The compiled graphcap entry format has been changed; you must rerun `compile_g'.

Changes to do with history and the editor:

*: Syntax errors now report the macro in which they occur. Beware that this may be incorrect, if the macro has already been fully scanned.
*: If VERBOSE is 1 or more, report the line that arithmetical errors occur on (e.g. mismatched dimensions, lg(0)).
*: You can now choose your history character (default: ^). This may be useful for TeX strings, I use `.
*: You can go to the start or end of a macro/the history list with ESC-< and ESC->. Use ESC-g to go to a line number.
*: You can no longer type a space after the history character to insert it into a line -- use quote_next instead (e.g. ESCq^).
*: Lines starting with a # in READ EDIT files are comments
*: In `.sm' files comments run from a # to the end of the line.
*: The various DELETE HISTORY commands now have siblings that omit the HISTORY and do not themselves appear on the history list.
*: The way that DO, FOREACH, IF, and MACRO command lists are treated has been fixed. If VERBOSE is 5 or more such lists will be printed as they are scanned.

Changes to do with macros:

*: The command APROPOS lists all macros whose names or initial comments match a given pattern.

Changes to do with variables:

*: Variables given in <> or {} are no longer tokenised, so spaces will no longer appear in funny places.

Changes to do with vectors:

*: You can now specify a printf-style format string to PRINT
*: The command SET name = macro(vector) has been changed. Previously only one argument was permitted, but it could be an expression, and the result was returned by assigning to $1 in a rather confusing way. Now many arguments are permitted (but they can't be expressions), and the result is returned as $0. See SET in the manual for more details.
*: It's possible to FFT vectors (actually pairs of vectors for the real and complex parts).
*: String valued vectors have been added to SM. They may be read from files (either by the row or by the column), printed, assigned to, tested for (in-)equality, and used to set the PTYPE. In the latter case the strings are used to label the points.
*: the SET DIMEN(vec) = expr statement has been altered, so the right-hand expression must be a number (with an optional suffix to denote a string-valued vector).
*: You can now define variables from IMAGE files (currently only supported for FITS), using DEFINE variable IMAGE
*: The expression vector[expr] has been generalised to allow expr to be a vector, so the result is now a vector of the same dimension as expr.
*: You can convert an expression into a string using STRING(expr).
*: It is now possible to specify that IMAGE files have no header, in which case you'll be prompted for the values of nx and ny (file_type no_header).

Changes to how plotting is done are as follows:

*: The values of TICKSIZE now make a difference for logarithmic axes.
*: The way you specify limits for logarithmic axes to AXIS is now consistent with the way you specify them to BOX. This Is A Change!
*: GRID now takes an optional second argument, specifying only an x or y grid
*: LTYPE ERASE allows you to erase some lines in a plot without erasing everything. This is only supported by some devices
*: ANGLE and EXPAND can now be given as vectors, to specify different angles and expansions for each point plotted
*: DOT will now work with user-defined ptypes
*: You can specify a PTYPE of a vector of strings.
*: The order of the default CTYPEs has been changed; you can now restore the default using the macro reset_ctype.

Changes to labels:

*: TeX strings now makes A_a^b put both sub- and super- scripts on the same symbol (use A_a{}^b if that isn't what you want)
*: A new bold (over-struck) \bf font is available.
*: If you define the variable default_font it will be used as your default font for labels (including for axes). You can define it in your `.sm' file if you so desire.
*: The position of the symbol for the constellation Taurus has been moved; this will not affect TeX_strings users. An Old English full stop is now a full stop.
*: `TeX definitions' are now specified in a file (and put into fonts.bin). This will not affect users, but does allow a SM administrator to add new definitions.
*: You can use \def to define your own TeX definitions.
*: You can specify more than 9 sides in TeX `point' or `apoint'
*: The `TeX' commands \raise and \kern are now available to move parts of strings about.
*: TeX-labels can now be put into variables without difficulty.

Changes to stdgraph:

*: A new encoder command `str` prompts you, then reads a character from the keyboard.
*: You can specify graphcap entries (or parts of graphcap entries) on the command line.
*: The 8th bit of graphcap entries is no longer stripped. To include an ascii null (\000) in an entry specify \377, a \377 may be written \377\377.

Changes to drivers

*: You can now specify options like -Ws to the sunview driver, use -WH for a list.
*: There is a new driver for a Unix-PC.
*: There is a new X11 driver (try DEVICE x11 -help for a list of options).
*: If you write your own drivers, the declarations of some functions have been changed to return void.

Changes to Callable SM

*: You must now include the library utils.a in addition to plotsub.a and devices.a when linking to SM as a graphics library.
*: The library names have been changed by pre-pending a `lib', so you can now say either `libdevices.a' or `-ldevices'. This allows the -L option to ld to work (under Unix).
*: If you compiled SM with an ANSI compiler, you should include the file "sm_declare.h" at the top of any C code that calls SM functions.

Bug fixes: (only the ones most visible to users are noted)