Numpy.savetxt ----- > 如何在 python numpy 中将数组/矩阵保存到 csv？

Question

I have created a sort of matrix/data-table in python from multiple arrays containing various kinds of data, which looks like this in the variable view:

phones  starts  mids

sil 308000.0    308195.0

DH  308390.0    308410.0

AH0 308430.0    308445.0

B   308460.0    308525.0

These are three lists that I have combined using numpy.columnstack(). I am trying to output this table/matrix in the same format/structure but as a csv using numpy.savetxt. Is this possible given the different variable types in each row/column?

When I try to run :

np.savetxt('blue.txt', np.column_stack((phones, phone_starts, phone_mids)), ',', fmt="%s %f")

I get the error:

File "<__array_function__ internals>", line 4, in savetxt
TypeError: _savetxt_dispatcher() got multiple values for argument 'fmt'

I have also tried without the 'fmt' option and have gotten a similar error.

Any ideas?

Answer 1

Well, do you want to save np arrays to csv with labels? that is the type of work for which pandas were created.

import numpy as np
import pandas as pd

data = {
"phone_starts": np.array([308000.0, 308390.0, 308430.0, 308460.0]),
"phone_mids": np.array([308195.0, 308410.0, 308445.0, 308525.0])
   }

df = pd.DataFrame(data, index=["sil", "DH", "AH0", "B"])
df.index.name = "Phone"
df.to_csv("blue.csv")