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numpy的squeeze函数使用方法

reshape函数:改变数组的维数(注意不是shape大小)

>>> e= np.arange(10)>>> e array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])>>> e.reshape(1,1,10) array([[[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]]])>>> e.reshape(1,1,10) array([[[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]]])>>> e.reshape(1,10,1) array([[[0],[1],[2],[3],[4],[5],[6],[7],[8],[9]]])squeeze 函数:从数组的形状中删除单维度条目,即把shape中为1的维度去掉用法:numpy.squeeze(a,axis = None) 1)a表示输入的数组;

2)axis用于指定需要删除的维度,但是指定的维度必须为单维度,否则将会报错;

3)axis的取值可为None 或 int 或 tuple of ints, 可选。若axis为空,则删除所有单维度的条目;

4)返回值:数组

5) 不会修改原数组;

>>> a = e.reshape(1,1,10)>>> a array([[[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]]])>>> np.squeeze(a) array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])体现在画图时>>> plt.plot(a) Traceback (most recent call last):File "", line 1, in File "C:\Python27\lib\site-packages\matplotlib\pyplot.py", line 3240, in plot ret = ax.plot(*args, **kwargs) File "C:\Python27\lib\site-packages\matplotlib\__init__.py", line 1710, in inner return func(ax, *args, **kwargs) File "C:\Python27\lib\site-packages\matplotlib\axes\_axes.py", line 1437, in plot for line in self._get_lines(*args, **kwargs):File "C:\Python27\lib\site-packages\matplotlib\axes\_base.py", line 404, in _grab_next_args for seg in self._plot_args(this, kwargs):File "C:\Python27\lib\site-packages\matplotlib\axes\_base.py", line 384, in _plot_args x, y = self._xy_from_xy(x, y) File "C:\Python27\lib\site-packages\matplotlib\axes\_base.py", line 246, in _xy_from_xy"shapes {} and {}".format(x.shape, y.shape)) ValueError: x and y can be no greater than 2-D, but have shapes (1L,) and (1L, 1L, 10L)>>> plt.plot(np.squeeze(a))[]>>> plt.show()

>>> np.squeeze(a).shape (10L,)通过np.squeeze()函数转换后,要显示的数组变成了秩为1的数组,即(10,)

参考:

http://blog.csdn.net/zenghaitao0128/article/details/78512715

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