Problem with assignment. Python error or mine?

[rafaeltfreire at gmail.com]

Em quinta-feira, 21 de dezembro de 2017 16:21:57 UTC+1, Neil Cerutti  escreveu:
> On 2017-12-21, rafaeltfreire at gmail.com <rafaeltfreire at 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
> 
> np.arange creates an object. The assignment makes X refer to that
> object.
> 
> > x1=X 
> 
> X refers to the previous object, and then the assignment makes x1
> refer to that same object.
> 
> -- 
> Neil Cerutti

Ok, great thank you. I am kind of new in python. I use to program in MATLAB but I am trying to migrate. 
So, to fix it what should I do? because my X is an NMR spectrum of many samples. 
Thank you very much!
Rafael