def transform_nodes(self, nodes, a, b, verbose=False):
        r"""
        Rescale standardized nodes (for `[-1, 1]`) to a general
        interval `[a, b]`. For a finite interval, a simple linear
        change of variables is used. Otherwise, the following
        transformations are used:

        .. math ::

            [a, \infty] : t = \frac{1}{x} + (a-1)

            [-\infty, b] : t = (b+1) - \frac{1}{x}

            [-\infty, \infty] : t = \frac{x}{\sqrt{1-x^2}}

        """
        ctx = self.ctx
        a = ctx.convert(a)
        b = ctx.convert(b)
        one = ctx.one
        if (a, b) == (-one, one):
            return nodes
        half = ctx.mpf(0.5)
        new_nodes = []
        if ctx.isinf(a) or ctx.isinf(b):
            if (a, b) == (ctx.ninf, ctx.inf):
                p05 = -half
                for x, w in nodes:
                    x2 = x*x
                    px1 = one-x2
                    spx1 = px1**p05
                    x = x*spx1
                    w *= spx1/px1
                    new_nodes.append((x, w))
            elif a == ctx.ninf:
                b1 = b+1
                for x, w in nodes:
                    u = 2/(x+one)
                    x = b1-u
                    w *= half*u**2
                    new_nodes.append((x, w))
            elif b == ctx.inf:
                a1 = 1-a
                for x, w in nodes:
                    u = 2/(x+one)
                    x = a1+u
                    w *= half*u**2
                    new_nodes.append((x, w))
            elif a == ctx.inf or b == ctx.ninf:
                return [(x,-w) for (x,w) in self.transform_nodes(nodes, b, a, verbose)]
            else:
                raise NotImplementedError
        else:
            # Simple linear change of variables
            C = (b-a)/2
            D = (b+a)/2
            for x, w in nodes:
                new_nodes.append((D+C*x, C*w))
        return new_nodes
dataset/ETHPy150Open fredrik-johansson/mpmath/mpmath/calculus/quadrature.py/QuadratureRule.transform_nodes/swapped operands of `-`