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Commit 684e91c

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Matthias Koeppe
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LinearFunction, LinearConstraint: Use linear_functions_parent() instead of deprecated MixedIntegerLinearProgram methods
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‎src/sage/numerical/linear_functions.pyx

+33-24
Original file line numberDiff line numberDiff line change
@@ -247,14 +247,15 @@ cdef class LinearFunctionOrConstraint(ModuleElement):
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::
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sage: p = MixedIntegerLinearProgram()
250+
sage: LF = p.linear_functions_parent()
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sage: from sage.numerical.linear_functions import LinearFunction
251-
sage: p({2 : 5, 3 : 2}) <= p({2 : 3, 9 : 2})
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sage: LF({2 : 5, 3 : 2}) <= LF({2 : 3, 9 : 2})
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5*x_2 + 2*x_3 <= 3*x_2 + 2*x_9
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sage: p({2 : 5, 3 : 2}) >= p({2 : 3, 9 : 2})
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sage: LF({2 : 5, 3 : 2}) >= LF({2 : 3, 9 : 2})
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3*x_2 + 2*x_9 <= 5*x_2 + 2*x_3
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sage: p({2 : 5, 3 : 2}) == p({2 : 3, 9 : 2})
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sage: LF({2 : 5, 3 : 2}) == LF({2 : 3, 9 : 2})
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5*x_2 + 2*x_3 == 3*x_2 + 2*x_9
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We can chain multiple (in)equalities::
@@ -304,8 +305,9 @@ cdef class LinearFunctionOrConstraint(ModuleElement):
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TESTS::
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sage: p.<x> = MixedIntegerLinearProgram()
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sage: LF = p.linear_functions_parent()
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sage: cm = sage.structure.element.get_coercion_model()
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sage: cm.explain(10, p(1), operator.le)
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sage: cm.explain(10, LF(1), operator.le)
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Coercion on left operand via
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Conversion map:
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From: Integer Ring
@@ -455,7 +457,8 @@ cdef class LinearFunctionOrConstraint(ModuleElement):
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EXAMPLES::
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sage: p = MixedIntegerLinearProgram()
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sage: f = p({2 : 5, 3 : 2})
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sage: LF = p.linear_functions_parent()
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sage: f = LF({2 : 5, 3 : 2})
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sage: f.__hash__() # random output
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sage: d = {}
@@ -471,7 +474,8 @@ cdef class LinearFunctionOrConstraint(ModuleElement):
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EXAMPLES::
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sage: p = MixedIntegerLinearProgram()
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sage: f = p({2 : 5, 3 : 2})
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sage: LF = p.linear_functions_parent()
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sage: f = LF({2 : 5, 3 : 2})
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sage: cmp(f, f)
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0
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sage: abs(cmp(f, f+0)) # since we are comparing by id()
@@ -665,6 +669,7 @@ cdef class LinearFunctionsParent_class(Parent):
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sage: LF._element_constructor_(123)
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123
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sage: p(123) # indirect doctest
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doctest:...: DeprecationWarning: ...
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123
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sage: type(_)
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<type 'sage.numerical.linear_functions.LinearFunction'>
@@ -749,19 +754,13 @@ cdef class LinearFunction(LinearFunctionOrConstraint):
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You should never instantiate :class:`LinearFunction`
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manually. Use the element constructor in the parent
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instead. For convenience, you can also call the
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:class:`MixedIntegerLinearProgram` instance directly.
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instead.
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EXAMPLES:
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For example, do this::
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sage: p = MixedIntegerLinearProgram()
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sage: p({0 : 1, 3 : -8})
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x_0 - 8*x_3
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or this::
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sage: parent = p.linear_functions_parent()
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sage: parent({0 : 1, 3 : -8})
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x_0 - 8*x_3
@@ -787,13 +786,15 @@ cdef class LinearFunction(LinearFunctionOrConstraint):
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With a dictionary::
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sage: p = MixedIntegerLinearProgram()
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sage: p({0 : 1, 3 : -8})
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sage: LF = p.linear_functions_parent()
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sage: LF({0 : 1, 3 : -8})
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x_0 - 8*x_3
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Using the constructor with a numerical value::
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sage: p = MixedIntegerLinearProgram()
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sage: p(25)
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sage: LF = p.linear_functions_parent()
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sage: LF(25)
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25
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"""
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ModuleElement.__init__(self, parent)
@@ -840,7 +841,8 @@ cdef class LinearFunction(LinearFunctionOrConstraint):
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EXAMPLE::
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sage: p = MixedIntegerLinearProgram()
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sage: lf = p({0 : 1, 3 : -8})
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sage: LF = p.linear_functions_parent()
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sage: lf = LF({0 : 1, 3 : -8})
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sage: lf.dict()
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{0: 1.0, 3: -8.0}
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"""
@@ -912,7 +914,8 @@ cdef class LinearFunction(LinearFunctionOrConstraint):
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EXAMPLE::
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sage: p = MixedIntegerLinearProgram()
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sage: p({0 : 1, 3 : -8}) + p({2 : 5, 3 : 2}) - 16
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sage: LF = p.linear_functions_parent()
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sage: LF({0 : 1, 3 : -8}) + LF({2 : 5, 3 : 2}) - 16
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-16 + x_0 + 5*x_2 - 6*x_3
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"""
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e = dict(self._f)
@@ -928,7 +931,8 @@ cdef class LinearFunction(LinearFunctionOrConstraint):
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EXAMPLE::
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sage: p = MixedIntegerLinearProgram()
931-
sage: - p({0 : 1, 3 : -8})
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sage: LF = p.linear_functions_parent()
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sage: - LF({0 : 1, 3 : -8})
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-1*x_0 + 8*x_3
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"""
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P = self.parent()
@@ -941,9 +945,10 @@ cdef class LinearFunction(LinearFunctionOrConstraint):
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EXAMPLE::
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sage: p = MixedIntegerLinearProgram()
944-
sage: p({2 : 5, 3 : 2}) - 3
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sage: LF = p.linear_functions_parent()
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sage: LF({2 : 5, 3 : 2}) - 3
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-3 + 5*x_2 + 2*x_3
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sage: p({0 : 1, 3 : -8}) - p({2 : 5, 3 : 2}) - 16
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sage: LF({0 : 1, 3 : -8}) - LF({2 : 5, 3 : 2}) - 16
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-16 + x_0 - 5*x_2 - 10*x_3
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"""
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e = dict(self._f)
@@ -959,7 +964,8 @@ cdef class LinearFunction(LinearFunctionOrConstraint):
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EXAMPLE::
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sage: p = MixedIntegerLinearProgram()
962-
sage: p({2 : 5, 3 : 2}) * 3
967+
sage: LF = p.linear_functions_parent()
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sage: LF({2 : 5, 3 : 2}) * 3
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15*x_2 + 6*x_3
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"""
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P = self.parent()
@@ -972,7 +978,8 @@ cdef class LinearFunction(LinearFunctionOrConstraint):
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EXAMPLE::
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sage: p = MixedIntegerLinearProgram()
975-
sage: 3 * p({2 : 5, 3 : 2})
981+
sage: LF = p.linear_functions_parent()
982+
sage: 3 * LF({2 : 5, 3 : 2})
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15*x_2 + 6*x_3
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"""
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return self._rmul_(b)
@@ -1094,10 +1101,12 @@ cdef class LinearFunction(LinearFunctionOrConstraint):
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EXAMPLE::
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sage: p = MixedIntegerLinearProgram(solver='GLPK')
1097-
sage: p({-1: -15, 2 : -5.1, 3 : 2/3})
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sage: LF = p.linear_functions_parent()
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sage: LF({-1: -15, 2 : -5.1, 3 : 2/3})
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-15 - 5.1*x_2 + 0.666666666667*x_3
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sage: p = MixedIntegerLinearProgram(solver='ppl')
1100-
sage: p({-1: -15, 2 : -5.1, 3 : 2/3})
1108+
sage: LF = p.linear_functions_parent()
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sage: LF({-1: -15, 2 : -5.1, 3 : 2/3})
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-15 - 51/10*x_2 + 2/3*x_3
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"""
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cdef dict d = dict(self._f)

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