Numpy.dot TypeError:无法根据规则“安全"将数组数据从dtype('float64')转换为dtype('S32') [英] Numpy.dot TypeError: Cannot cast array data from dtype('float64') to dtype('S32') according to the rule 'safe'

问题描述

为什么在使用np.dot(a,b.T)时出现此错误:

Why am I getting this error when using np.dot(a,b.T):

TypeError: Cannot cast array data from dtype('float64') 
               to dtype('S32') according to the rule 'safe'

a和b的类型为numpy.ndarray.我的NumPy版本是1.11.0.

a and b are of type numpy.ndarray. My NumPy version is 1.11.0.

推荐答案

只需从BrenBarn和Warren Weckesser的输入中提供一个应运行的代码段(通过将字符串转换为float即可):

Just taking the input from BrenBarn and Warren Weckesser to provide a code snippet which should run (by converting your strings to float):

a = map(lambda x: float(x),a)
b = map(lambda x: float(x),b)
np.dot(a,b.T)

或更简单，如@JLT所建议

or simpler as suggested by @JLT

a = map(float,a)
b = map(float,b)
np.dot(a,b.T)

但是正如沃伦·韦克瑟(Warren Weckesser)所说的那样，您应该检查数组的类型，很可能其中一个已经包含浮点数.

But as Warren Weckesser already said, you should check the types of the array, most likely one already contains floats.

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