how to shift values in an array in python

Question

xs = np.linspace(-1,1,6)# [ -1 -0.6 -0.2 0.2 0.6 1] i want it to shift [ -0.6 -0.2 0 0 0.2 0.6]

Can you add some of the code which you have tried? This way we can have a look and find your problem together. — Stijn Van Daele
– Stijn Van Daele, Commented Mar 25, 2017 at 15:44
def chainLength(xs,ys): LL = np.sqrt((xs - (xs - 1)**2) + ((ys - (ys - 1))**2)) return np.sum(LL) — Akashdeep Gill
– Akashdeep Gill, Commented Mar 25, 2017 at 15:51
and this is notation of length of path math.sqrt(xj - x(j - 1))**2 + (yj - y(j - 1))**2 and i can't use loops onyl numpy to get the sum — Akashdeep Gill
– Akashdeep Gill, Commented Mar 25, 2017 at 15:53

Stijn Van Daele · Accepted Answer · 2017-03-25 16:10:25Z

1

Since the question is very vague, I am assuming that you're having a problem with the np.sqrt. Since this might create Nan values, you can exchange them for zeros. Hereby avoiding this problem.

For me, your code works.

import numpy as np

xs = np.array([ 2,  3,  1,  0, 10,  0, 10,  0, 10])
ys = np.array([ 2,  3,  1,  0, 10,  0, 10,  0, 10])

def chainLength(xs,ys): 


    LL = np.sqrt((xs - (xs - 1)**2) + ((ys - (ys - 1))**2)) 
    LL = np.nan_to_num(LL)
    return (np.sum(LL))

chainLength(xs, ys)

answered Mar 25, 2017 at 16:10

Stijn Van Daele

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3 Comments

Akashdeep Gill Over a year ago

And can u tell me this also

Akashdeep Gill Over a year ago

i just wanted to know the stuff i edited above can u help me on that also

Stijn Van Daele Over a year ago

I do not understand the question anymore. Please stop changing the original question.

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