I am trying to create a 2 * 3 numpy array as below:
x_sample= np.array([31000,28.69,7055.47],[79000,3.9,16933.26]);
But I get:
TypeError: data type not understood
Why am I getting the error?
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3 Answers
You are missing brackets around the two lists.
x_sample= np.array([[31000,28.69,7055.47],[79000,3.9,16933.26]])
The way it was written the dtype argument was receiving the value [79000,3.9,16933.26], which obviously cannot be interpreted as a valid NumPy data type and caused the error.
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You can try
np.vstack(([31000,28.69,7055.47],[79000,3.9,16933.26]))
Comments
The TypeError: data type not understood also occurs when trying to create a structured array, if the names defined in the dtype argument are not of type str.
Consider this minimal example:
numpy.array([], dtype=[(name, int)])
- fails in Python 2 if
type(name) is unicode - fails in Python 3 if
type(name) is bytes - succeeds in Python 2 and 3 if
type(name) is str
(tested with Python 2.7 + numpy 1.14, and Python 3.6 + numpy 1.15)
