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mongodb数据重启后消失了

np.meshgrid简单使用功能把向量转换成矩阵实例x = np.array([1,2,3])y = np.array([4,5,6])np.meshgrid(x,y,sparse=True)结果：x,y = np.meshgrid(x,y,sparse=True)x.shapey.shape结果：(1, 3)(3, 1)如果没有sparse这个参数会怎样。np.meshgrid(x,y)结果：x,y = np.meshgrid(x,y)x.shap

np.linspace简单使用官网：np.linspace功能：在指定的间隔内返回等间距的数字。简单使用：import numpy as npx = np.linspace(1,100,99)x结果：array([ 1. , 2.01020408, 3.02040816, 4.03061224, 5.04081633, 6.05102041, 7.06122449, 8.07142857, 9.08163265, 10.0