189 lines
6.5 KiB
Groff
189 lines
6.5 KiB
Groff
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'\" -*- coding: us-ascii -*-
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.if \n(.g .ds T< \\FC
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.if \n(.g .ds T> \\F[\n[.fam]]
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.de URL
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\\$2 \(la\\$1\(ra\\$3
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..
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.if \n(.g .mso www.tmac
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.TH isympy 1 2007-10-8 "" ""
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.SH NAME
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isympy \- interactive shell for SymPy
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.SH SYNOPSIS
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'nh
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.fi
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.ad l
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\fBisympy\fR \kx
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.if (\nx>(\n(.l/2)) .nr x (\n(.l/5)
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'in \n(.iu+\nxu
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[\fB-c\fR | \fB--console\fR] [\fB-p\fR ENCODING | \fB--pretty\fR ENCODING] [\fB-t\fR TYPE | \fB--types\fR TYPE] [\fB-o\fR ORDER | \fB--order\fR ORDER] [\fB-q\fR | \fB--quiet\fR] [\fB-d\fR | \fB--doctest\fR] [\fB-C\fR | \fB--no-cache\fR] [\fB-a\fR | \fB--auto\fR] [\fB-D\fR | \fB--debug\fR] [
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-- | PYTHONOPTIONS]
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'in \n(.iu-\nxu
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.ad b
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'hy
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'nh
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.fi
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.ad l
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\fBisympy\fR \kx
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.if (\nx>(\n(.l/2)) .nr x (\n(.l/5)
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'in \n(.iu+\nxu
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[
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{\fB-h\fR | \fB--help\fR}
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{\fB-v\fR | \fB--version\fR}
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]
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'in \n(.iu-\nxu
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.ad b
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'hy
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.SH DESCRIPTION
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isympy is a Python shell for SymPy. It is just a normal python shell
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(ipython shell if you have the ipython package installed) that executes
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the following commands so that you don't have to:
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.PP
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.nf
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\*(T<
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>>> from __future__ import division
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>>> from sympy import *
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>>> x, y, z = symbols("x,y,z")
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>>> k, m, n = symbols("k,m,n", integer=True)
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\*(T>
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.fi
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.PP
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So starting isympy is equivalent to starting python (or ipython) and
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executing the above commands by hand. It is intended for easy and quick
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experimentation with SymPy. For more complicated programs, it is recommended
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to write a script and import things explicitly (using the "from sympy
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import sin, log, Symbol, ..." idiom).
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.SH OPTIONS
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.TP
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\*(T<\fB\-c \fR\*(T>\fISHELL\fR, \*(T<\fB\-\-console=\fR\*(T>\fISHELL\fR
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Use the specified shell (python or ipython) as
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console backend instead of the default one (ipython
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if present or python otherwise).
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Example: isympy -c python
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\fISHELL\fR could be either
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\&'ipython' or 'python'
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.TP
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\*(T<\fB\-p \fR\*(T>\fIENCODING\fR, \*(T<\fB\-\-pretty=\fR\*(T>\fIENCODING\fR
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Setup pretty printing in SymPy. By default, the most pretty, unicode
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printing is enabled (if the terminal supports it). You can use less
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pretty ASCII printing instead or no pretty printing at all.
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Example: isympy -p no
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\fIENCODING\fR must be one of 'unicode',
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\&'ascii' or 'no'.
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.TP
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\*(T<\fB\-t \fR\*(T>\fITYPE\fR, \*(T<\fB\-\-types=\fR\*(T>\fITYPE\fR
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Setup the ground types for the polys. By default, gmpy ground types
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are used if gmpy2 or gmpy is installed, otherwise it falls back to python
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ground types, which are a little bit slower. You can manually
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choose python ground types even if gmpy is installed (e.g., for testing purposes).
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Note that sympy ground types are not supported, and should be used
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only for experimental purposes.
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Note that the gmpy1 ground type is primarily intended for testing; it the
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use of gmpy even if gmpy2 is available.
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This is the same as setting the environment variable
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SYMPY_GROUND_TYPES to the given ground type (e.g.,
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SYMPY_GROUND_TYPES='gmpy')
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The ground types can be determined interactively from the variable
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sympy.polys.domains.GROUND_TYPES inside the isympy shell itself.
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Example: isympy -t python
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\fITYPE\fR must be one of 'gmpy',
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\&'gmpy1' or 'python'.
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.TP
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\*(T<\fB\-o \fR\*(T>\fIORDER\fR, \*(T<\fB\-\-order=\fR\*(T>\fIORDER\fR
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Setup the ordering of terms for printing. The default is lex, which
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orders terms lexicographically (e.g., x**2 + x + 1). You can choose
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other orderings, such as rev-lex, which will use reverse
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lexicographic ordering (e.g., 1 + x + x**2).
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Note that for very large expressions, ORDER='none' may speed up
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printing considerably, with the tradeoff that the order of the terms
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in the printed expression will have no canonical order
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Example: isympy -o rev-lax
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\fIORDER\fR must be one of 'lex', 'rev-lex', 'grlex',
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\&'rev-grlex', 'grevlex', 'rev-grevlex', 'old', or 'none'.
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.TP
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\*(T<\fB\-q\fR\*(T>, \*(T<\fB\-\-quiet\fR\*(T>
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Print only Python's and SymPy's versions to stdout at startup, and nothing else.
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.TP
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\*(T<\fB\-d\fR\*(T>, \*(T<\fB\-\-doctest\fR\*(T>
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Use the same format that should be used for doctests. This is
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equivalent to '\fIisympy -c python -p no\fR'.
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.TP
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\*(T<\fB\-C\fR\*(T>, \*(T<\fB\-\-no\-cache\fR\*(T>
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Disable the caching mechanism. Disabling the cache may slow certain
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operations down considerably. This is useful for testing the cache,
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or for benchmarking, as the cache can result in deceptive benchmark timings.
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This is the same as setting the environment variable SYMPY_USE_CACHE
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to 'no'.
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.TP
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\*(T<\fB\-a\fR\*(T>, \*(T<\fB\-\-auto\fR\*(T>
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Automatically create missing symbols. Normally, typing a name of a
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Symbol that has not been instantiated first would raise NameError,
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but with this option enabled, any undefined name will be
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automatically created as a Symbol. This only works in IPython 0.11.
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Note that this is intended only for interactive, calculator style
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usage. In a script that uses SymPy, Symbols should be instantiated
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at the top, so that it's clear what they are.
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This will not override any names that are already defined, which
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includes the single character letters represented by the mnemonic
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QCOSINE (see the "Gotchas and Pitfalls" document in the
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documentation). You can delete existing names by executing "del
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name" in the shell itself. You can see if a name is defined by typing
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"'name' in globals()".
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The Symbols that are created using this have default assumptions.
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If you want to place assumptions on symbols, you should create them
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using symbols() or var().
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Finally, this only works in the top level namespace. So, for
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example, if you define a function in isympy with an undefined
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Symbol, it will not work.
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.TP
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\*(T<\fB\-D\fR\*(T>, \*(T<\fB\-\-debug\fR\*(T>
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Enable debugging output. This is the same as setting the
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environment variable SYMPY_DEBUG to 'True'. The debug status is set
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in the variable SYMPY_DEBUG within isympy.
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.TP
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-- \fIPYTHONOPTIONS\fR
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These options will be passed on to \fIipython (1)\fR shell.
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Only supported when ipython is being used (standard python shell not supported).
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Two dashes (--) are required to separate \fIPYTHONOPTIONS\fR
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from the other isympy options.
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For example, to run iSymPy without startup banner and colors:
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isympy -q -c ipython -- --colors=NoColor
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.TP
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\*(T<\fB\-h\fR\*(T>, \*(T<\fB\-\-help\fR\*(T>
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Print help output and exit.
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.TP
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\*(T<\fB\-v\fR\*(T>, \*(T<\fB\-\-version\fR\*(T>
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Print isympy version information and exit.
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.SH FILES
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.TP
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\*(T<\fI${HOME}/.sympy\-history\fR\*(T>
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Saves the history of commands when using the python
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shell as backend.
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.SH BUGS
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The upstreams BTS can be found at \(lahttps://github.com/sympy/sympy/issues\(ra
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Please report all bugs that you find in there, this will help improve
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the overall quality of SymPy.
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.SH "SEE ALSO"
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\fBipython\fR(1), \fBpython\fR(1)
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