On 2017-12-21 15:05, rafaeltfre...@gmail.com wrote:
Dear community, I am having the following problem when I am assigning the
elements of a vector below a certain number to zero or any other value.
I am creating a new variable but Python edits the root variable. Why?
import numpy as np
X=np.arange(1, 10000, 1) #root variable
x1=X
x1[x1<10000]=0
print(X)
Out[1]: array([ 0., 0., 0., ..., 0., 0., 0.])
Why????????? It is supposed to be the original value
Thank you for your time
Rafael
Python never makes a copy unless you ask it to.
What x1=X does is make the name x1 refer to the same object that X
refers to. No copying.
As you're using numpy, you can use the .copy method:
x1 = X.copy()
This makes the name x1 refer to a new copy of the object that X refers to.
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