+++ /dev/null
-Linear Expression Module
-========================
-
-This class implements linear expressions. A linear expression is….
-
-.. py:class:: Expression
-
- .. py:method:: __new__(cls, coefficients=None, constant=0)
-
- Create and return a new linear expression from a string or a list of coefficients and a constant.
-
- .. py:method:: coefficient(self, symbol)
-
- Return the coefficient value of the given symbol.
-
- .. py:method:: coefficients(self)
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- Return a list of the coefficients of an expression
-
- .. attribute:: constant
-
- Return the constant value of an expression.
-
- .. attribute:: symbols
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- Return a list of symbols in an expression.
-
- .. attribute:: dimension
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- Return the number of variables in an expression.
-
- .. py:method:: isconstant(self)
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- Return ``True`` if an expression is a constant.
-
- .. py:method:: issymbol(self)
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- Return ``True`` if an expression is a symbol.
-
-
- .. py:method:: values(self)
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- Return the coefficient and constant values of an expression.
-
- .. py:method:: __add__(self, other)
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- Return the sum of *self* and *other*.
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- .. py:method:: __sub__(self, other)
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- Return the difference between *self* and *other*.
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- .. py:method:: __mul__(self, other)
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- Return the product of *self* and *other* if *other* is a rational number.
-
- .. py:method:: __eq__(self, other)
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- Test whether two expressions are equal.
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- .. py:method:: __le__(self, other)
- self <= other
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- Create a new polyhedra from an expression with a single constraint as *self* less than or equal to *other*.
-
- .. py:method:: __lt__(self, other)
- self < other
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- Create a new polyhedra from an expression with a single constraint as *self* less than *other*.
-
- .. py:method:: __ge__(self, other)
- self >= other
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- Create a new polyhedra from an expression with a single constraint as *self* greater than or equal to *other*.
-
- .. py:method:: __gt__(self, other)
- self > other
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- Create a new polyhedra from an expression with a single constraint as *self* greater than *other*.
-
- .. py:method:: scaleint(self)
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- Multiply an expression by a scalar to make all coefficients integer values.
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- .. py:method:: subs(self, symbol, expression=None)
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- Subsitute the given value into an expression and return the resulting expression.
-
-
- .. py:method:: fromstring(self)
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- Create an expression from a string.
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- .. py:method:: fromsympy(self)
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- Convert sympy object to an expression.
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- .. py:method:: tosympy(self)
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- Return an expression as a sympy object.
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-.. py:class:: Symbol(Expression)
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- .. py:method:: __new__(cls, name)
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- Create and return a symbol from a string.
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- .. py:method:: symbols(names)
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- This function returns a sequence of symbols with names taken from names argument, which can be a comma or whitespace delimited string, or a sequence of strings.
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- .. py:method:: asdummy(self)
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- Return a symbol as a :class:`Dummy` Symbol.
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-.. py:class:: Dummy(Symbol)
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- This class returns a dummy symbol to ensure that no variables are repeated in an expression. This is useful when the user needs to have a unique symbol, for example as a temporary one in some calculation, which is going to be substituted for something else at the end anyway.
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- .. py:method:: __new__(cls, name=None)
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- Create and return a new dummy symbol.
-
-
-.. py:class:: Rational(Expression, Fraction)
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- This class represents integers and rational numbers of any size.
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- .. attribute:: constant
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- Return rational as a constant.
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- .. py:method:: isconstant(self)
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- Test whether a value is a constant.
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- .. py:method:: fromsympy(cls, expr)
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- Create a rational object from a sympy expression
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projects / linpy.git / blobdiff