(self)
Generates the mesh for generating a contour.

        In the case of equality, ``contour`` function of matplotlib can
        be used. In other cases, matplotlib's ``contourf`` is used.
Generates the mesh for generating a contour.
Generates the mesh for generating a contour .
def _get_meshes_grid(self):
        """Generates the mesh for generating a contour.

        In the case of equality, ``contour`` function of matplotlib can
        be used. In other cases, matplotlib's ``contourf`` is used.
        """
        equal = False
        if isinstance(self.expr, Equality):
            expr = self.expr.lhs - self.expr.rhs
            equal = True

        elif isinstance(self.expr, (GreaterThan, StrictGreaterThan)):
            expr = self.expr.lhs - self.expr.rhs

        elif isinstance(self.expr, (LessThan, StrictLessThan)):
            expr = self.expr.rhs - self.expr.lhs
        else:
            raise NotImplementedError("The expression is not supported for "
                                    "plotting in uniform meshed plot.")
        np = import_module('numpy')
        xarray = np.linspace(self.start_x, self.end_x, self.nb_of_points)
        yarray = np.linspace(self.start_y, self.end_y, self.nb_of_points)
        x_grid, y_grid = np.meshgrid(xarray, yarray)

        func = vectorized_lambdify((self.var_x, self.var_y), expr)
        z_grid = func(x_grid, y_grid)
        z_grid[np.ma.where(z_grid < 0)] = -1
        z_grid[np.ma.where(z_grid > 0)] = 1
        if equal:
            return xarray, yarray, z_grid, 'contour'
        else:
            return xarray, yarray, z_grid, 'contourf'
def _get_meshes_grid ( self ) : equal = False if isinstance ( self . expr , Equality ) : expr = self . expr . lhs - self . expr . rhs equal = True elif isinstance ( self . expr , ( GreaterThan , StrictGreaterThan ) ) : expr = self . expr . lhs - self . expr . rhs elif isinstance ( self . expr , ( LessThan , StrictLessThan ) ) : expr = self . expr . rhs - self . expr . lhs else : raise NotImplementedError ( "The expression is not supported for " "plotting in uniform meshed plot." ) np = import_module ( 'numpy' ) xarray = np . linspace ( self . start_x , self . end_x , self . nb_of_points ) yarray = np . linspace ( self . start_y , self . end_y , self . nb_of_points ) x_grid , y_grid = np . meshgrid ( xarray , yarray ) func = vectorized_lambdify ( ( self . var_x , self . var_y ) , expr ) z_grid = func ( x_grid , y_grid ) z_grid [ np . ma . where ( z_grid < 0 ) ] = - 1 z_grid [ np . ma . where ( z_grid > 0 ) ] = 1 if equal : return xarray , yarray , z_grid , 'contour' else : return xarray , yarray , z_grid , 'contourf'