我有一个2D数组,它的前3列表示x、y、z坐标,最后一列包含一些数据。我正在尝试使用上一列中的数据创建一个3D阵列。我为此编写的代码有3个for循环。如果有人能对这段代码提出改进建议,或者有其他更好的方法来达成相同的解决方案,我们将不胜感激
tempData = np.loadtxt(cwd+'/T_t0-t20.txt', comments='%', usecols=(0,1,2,3))
x = np.sort(np.unique(tempData[:, 0]))
y = np.sort(np.unique(tempData[:, 1]))
z = np.sort(np.unique(tempData[:, 2]))
temp = np.zeros((len(x),len(y),len(z)))
for i in range(len(x)):
for j in range(len(y)):
for k in range(len(z)):
xind = np.where(tempData[:,0]==x[i])[0]
yind = np.where(tempData[:,1]==y[j])[0]
zind = np.where(tempData[:,2]==z[k])[0]
Tind = np.intersect1d(np.intersect1d(xind, yind), zind)[0]
temp[i,j,k] = tempData[:,3][Tind]
下面是一个示例输入2D数组(tempData):
[[ 0.0000e+00 -2.1429e-02 0.0000e+00 8.5963e+02]
[ 2.0202e-02 -2.1429e-02 0.0000e+00 8.1597e+02]
[ 4.0404e-02 -2.1429e-02 0.0000e+00 7.7315e+02]
[ 0.0000e+00 0.0000e+00 0.0000e+00 9.1180e+02]
[ 2.0202e-02 0.0000e+00 0.0000e+00 8.5293e+02]
[ 4.0404e-02 0.0000e+00 0.0000e+00 7.9282e+02]
[ 0.0000e+00 2.1429e-02 0.0000e+00 8.2700e+02]
[ 2.0202e-02 2.1429e-02 0.0000e+00 8.1224e+02]
[ 4.0404e-02 2.1429e-02 0.0000e+00 7.7315e+02]
[ 0.0000e+00 -2.1429e-02 -2.2222e-02 8.5946e+02]
[ 2.0202e-02 -2.1429e-02 -2.2222e-02 8.1589e+02]
[ 4.0404e-02 -2.1429e-02 -2.2222e-02 7.7315e+02]
[ 0.0000e+00 0.0000e+00 -2.2222e-02 9.1153e+02]
[ 2.0202e-02 0.0000e+00 -2.2222e-02 8.5278e+02]
[ 4.0404e-02 0.0000e+00 -2.2222e-02 7.9278e+02]
[ 0.0000e+00 2.1429e-02 -2.2222e-02 8.2689e+02]
[ 2.0202e-02 2.1429e-02 -2.2222e-02 8.1216e+02]
[ 4.0404e-02 2.1429e-02 -2.2222e-02 7.7315e+02]
[ 0.0000e+00 -2.1429e-02 -4.4444e-02 8.3552e+02]
[ 2.0202e-02 -2.1429e-02 -4.4444e-02 8.0395e+02]
[ 4.0404e-02 -2.1429e-02 -4.4444e-02 7.7315e+02]
[ 0.0000e+00 0.0000e+00 -4.4444e-02 8.7343e+02]
[ 2.0202e-02 0.0000e+00 -4.4444e-02 8.3067e+02]
[ 4.0404e-02 0.0000e+00 -4.4444e-02 7.8726e+02]
[ 0.0000e+00 2.1429e-02 -4.4444e-02 8.1191e+02]
[ 2.0202e-02 2.1429e-02 -4.4444e-02 8.0125e+02]
[ 4.0404e-02 2.1429e-02 -4.4444e-02 7.7315e+02]]
下面是预期输出数组(temp):
[[[835.52 859.46 859.63]
[873.43 911.53 911.8 ]
[811.91 826.89 827. ]]
[[803.95 815.89 815.97]
[830.67 852.78 852.93]
[801.25 812.16 812.24]]
[[773.15 773.15 773.15]
[787.26 792.78 792.82]
[773.15 773.15 773.15]]]
我找到了一个更好(有效)的方法使用Numpy的lexsort。这完全避免了for的循环。这里执行多列排序,首先沿“x”,然后沿“y”,然后沿“z”。代码如下:
相关问题 更多 >
编程相关推荐