How to combine two float64 column vector?

[dsarica]

Hi All

I've 2 float64 column vector with same row and i would like to combine them as a one float64 matrix.

I tried df.replace from pandas and it gives me an error like this:

Error:
X_test= df.replace(to_replace=X_test[:,2799], value=result[:,0])

Traceback (most recent call last):

  File "<ipython-input-68-b1967d57b9e4>", line 1, in <module>
    X_test= df.replace(to_replace=X_test[:,2799], value=result[:,0])

NameError: name 'df' is not defined

can someone tell me where I'm doing wrong? or is there an alternative way to do this?

[Yoriz]

You haven't shown the code that df is defined in and the error is saying that it hasn't been defined.