Python ConcreteModel.rect_length方法代码示例

# 需要导入模块: from pyomo.environ import ConcreteModel [as 别名]
# 或者: from pyomo.environ.ConcreteModel import rect_length [as 别名]
def build_rect_strip_packing_model():
    """Build the strip packing model."""
    model = ConcreteModel(name="Rectangles strip packing")
    model.rectangles = Set(ordered=True, initialize=[0, 1, 2, 3, 4, 5, 6, 7])

    # Width and Length of each rectangle
    model.rect_width = Param(
        model.rectangles, initialize={0: 3, 1: 3, 2: 2, 3: 2, 4: 3, 5: 5,
                                      6: 7, 7: 7})
    # parameter indexed by each rectangle
    # same as height?
    model.rect_length = Param(
        model.rectangles, initialize={0: 4, 1: 3, 2: 2, 3: 2, 4: 3, 5: 3,
                                      6: 4, 7: 4})

    model.strip_width = Param(
        initialize=10, doc="Available width of the strip")

    # upperbound on length (default is sum of lengths of rectangles)
    model.max_length = Param(
        initialize=sum(model.rect_length[i] for i in model.rectangles),
        doc="maximum length of the strip (if all rectangles were arranged "
        "lengthwise)")

    # x (length) and y (width) coordinates of each of the rectangles
    model.x = Var(model.rectangles,
                  bounds=(0, model.max_length),
                  doc="rectangle corner x-position (position across length)")

    def w_bounds(m, i):
        return (0, m.strip_width - m.rect_width[i])
    model.y = Var(model.rectangles,
                  bounds=w_bounds,
                  doc="rectangle corner y-position (position down width)")

    model.strip_length = Var(
        within=NonNegativeReals, doc="Length of strip required.")

    def rec_pairs_filter(model, i, j):
        return i < j
    model.overlap_pairs = Set(
        initialize=model.rectangles * model.rectangles,
        dimen=2, filter=rec_pairs_filter,
        doc="set of possible rectangle conflicts")

    @model.Constraint(model.rectangles)
    def strip_ends_after_last_rec(model, i):
        return model.strip_length >= model.x[i] + model.rect_length[i]

    model.total_length = Objective(expr=model.strip_length,
                                   doc="Minimize length")

    @model.Disjunction(
        model.overlap_pairs,
        doc="Make sure that none of the rectangles on the strip overlap in "
        "either the x or y dimensions.")
    def no_overlap(m, i, j):
        return [
            m.x[i] + m.rect_length[i] <= m.x[j],
            m.x[j] + m.rect_length[j] <= m.x[i],
            m.y[i] + m.rect_width[i] <= m.y[j],
            m.y[j] + m.rect_width[j] <= m.y[i],
        ]

    return model

# 需要导入模块: from pyomo.environ import ConcreteModel [as 别名]
# 或者: from pyomo.environ.ConcreteModel import rect_length [as 别名]
def build_constrained_layout_model():
    """Build the model."""
    m = ConcreteModel(name="2-D constrained layout")
    m.rectangles = RangeSet(3, doc="Three rectangles")
    m.circles = RangeSet(2, doc="Two circles")

    m.rect_length = Param(
        m.rectangles, initialize={1: 5, 2: 7, 3: 3},
        doc="Rectangle length")
    m.rect_height = Param(
        m.rectangles, initialize={1: 6, 2: 5, 3: 3},
        doc="Rectangle height")

    m.circle_x = Param(m.circles, initialize={1: 15, 2: 50},
                       doc="x-coordinate of circle center")
    m.circle_y = Param(m.circles, initialize={1: 10, 2: 80},
                       doc="y-coordinate of circle center")
    m.circle_r = Param(m.circles, initialize={1: 6, 2: 5},
                       doc="radius of circle")

    @m.Param(m.rectangles, doc="Minimum feasible x value for rectangle")
    def x_min(m, rect):
        return min(
            m.circle_x[circ] - m.circle_r[circ] + m.rect_length[rect] / 2
            for circ in m.circles)

    @m.Param(m.rectangles, doc="Maximum feasible x value for rectangle")
    def x_max(m, rect):
        return max(
            m.circle_x[circ] + m.circle_r[circ] - m.rect_length[rect] / 2
            for circ in m.circles)

    @m.Param(m.rectangles, doc="Minimum feasible y value for rectangle")
    def y_min(m, rect):
        return min(
            m.circle_y[circ] - m.circle_r[circ] + m.rect_height[rect] / 2
            for circ in m.circles)

    @m.Param(m.rectangles, doc="Maximum feasible y value for rectangle")
    def y_max(m, rect):
        return max(
            m.circle_y[circ] + m.circle_r[circ] - m.rect_height[rect] / 2
            for circ in m.circles)

    m.ordered_rect_pairs = Set(
        initialize=m.rectangles * m.rectangles,
        filter=lambda _, r1, r2: r1 != r2)
    m.rect_pairs = Set(initialize=[
        (r1, r2) for r1, r2 in m.ordered_rect_pairs
        if r1 < r2])

    m.rect_sep_penalty = Param(
        m.rect_pairs, initialize={(1, 2): 300, (1, 3): 240, (2, 3): 100},
        doc="Penalty for separation distance between two rectangles.")

    def x_bounds(m, rect):
        return m.x_min[rect], m.x_max[rect]

    def y_bounds(m, rect):
        return m.y_min[rect], m.y_max[rect]

    m.rect_x = Var(
        m.rectangles, doc="x-coordinate of rectangle center",
        bounds=x_bounds)
    m.rect_y = Var(
        m.rectangles, doc="y-coordinate of rectangle center",
        bounds=y_bounds)
    m.dist_x = Var(
        m.rect_pairs, doc="x-axis separation between rectangle pair")
    m.dist_y = Var(
        m.rect_pairs, doc="y-axis separation between rectangle pair")

    m.min_dist_cost = Objective(
        expr=sum(m.rect_sep_penalty[r1, r2] *
                 (m.dist_x[r1, r2] + m.dist_y[r1, r2])
                 for (r1, r2) in m.rect_pairs))

    @m.Constraint(m.ordered_rect_pairs,
                  doc="x-distance between rectangles")
    def dist_x_defn(m, r1, r2):
        return m.dist_x[
            tuple(sorted([r1, r2]))] >= m.rect_x[r2] - m.rect_x[r1]

    @m.Constraint(m.ordered_rect_pairs,
                  doc="y-distance between rectangles")
    def dist_y_defn(m, r1, r2):
        return m.dist_y[
            tuple(sorted([r1, r2]))] >= m.rect_y[r2] - m.rect_y[r1]

    @m.Disjunction(
        m.rect_pairs,
        doc="Make sure that none of the rectangles overlap in "
        "either the x or y dimensions.")
    def no_overlap(m, r1, r2):
        return [
            m.rect_x[r1] + m.rect_length[r1] / 2 <= (
                m.rect_x[r2] - m.rect_length[r2] / 2),
            m.rect_y[r1] + m.rect_height[r1] / 2 <= (
                m.rect_y[r2] - m.rect_height[r2] / 2),
            m.rect_x[r2] + m.rect_length[r2] / 2 <= (
#.........这里部分代码省略.........