当尝试连接具有dtype字符串但具有不同长度的字段的记录数组时,连接失败.
正如您在下面的示例中所看到的,如果'f1'具有相同的长度但是失败则连接起作用,否则失败.
In [1]: import numpy as np
In [2]: a = np.core.records.fromarrays( ([1,2], ["one","two"]) )
In [3]: b = np.core.records.fromarrays( ([3,4,5], ["three","four","three"]) )
In [4]: c = np.core.records.fromarrays( ([6], ["six"]) )
In [5]: np.concatenate( (a,c) )
Out[5]:
array([(1, 'one'), (2, 'two'), (6, 'six')],
dtype=[('f0', '<i8'), ('f1', '|S3')])
In [6]: np.concatenate( (a,b) )
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
/u/jegannas/<ipython console> in <module>()
TypeError: expected a readable buffer object
但是,如果我们只是连接数组(而不是记录),它会成功,尽管字符串的大小不同.
In [8]: np.concatenate( (a['f1'], b['f1']) )
Out[8]:
array(['one', 'two', …