sympy {rSymPy}R Documentation

~~function to do ... ~~

Description

Interface to the sympy computer algebra system.

Usage

sympy(..., output = TRUE, debug = FALSE)

Arguments

... Character strings which are pasted together with space separators. The resulting string is passed to sympy.
output Logical. If FALSE then no output is generated.
debug Logical. If TRUE then additional debugging info is shown.

Details

The sympy function passes an input string to SymPy and returns the output. The first time sympy is invokved in a session it also starts up SymPy by invoking sympyStart. As a result the first invocation of sympy can be expected to much slower than subsequent ones. sympyStart creates a variable .Rsympy which is stored in the global environment holding the connection information to the SymPy/Jython session.

Internally if the argument output=TRUE, the default, input character string is prefaced with __Rsympy= so if such preface would cause an error then ensure that the argument output=FALSE.

Note that error messages from SymPy appear on the shell/batch console, not on the R console. In the case of an error message the returned value may be wrong.

Value

The character string produced from SymPy.

Note

SymPy is run under Jython, the Java version of Python.

References

http://code.google.com/p/sympy/, http://www.jython.org/Project/

Examples

## Not run: 
# These examples are mostly from: http://wiki.sympy.org/wiki/Tutorial

# create a SymPy variable called x
sympy("var('x')")
sympy("y = x*x")
sympy("y")

sympy("limit(1/x, x, oo)")

sympy("(1/cos(x)).series(x, 0, 10)")

sympy("diff(sin(2*x), x, 1)")
sympy("diff(sin(2*x), x, 2)")

sympy("integrate(exp(-x), (x, 0, oo))")

sympy("xr = Symbol('xr', real=True)")
sympy("exp(I*xr).expand(complex=True)")

sympy("solve(x**2 - x, x)")
sympy("var('y')")
sympy("solve([x + 5*y - 2, -3*x + 6*y - 15], [x, y])")

# Matrices are stored row by row (unlike R matrices)
cat(sympy("A = Matrix([[1,x], [y,1]])"), "\n")
cat(sympy("A**2"), "\n")

## End(Not run)

[Package rSymPy version 0.1-2 Index]