# [Tutor] Maximum value in an array

Aaliyah Ebrahim aaliyahebrahim21 at gmail.com
Fri Mar 17 07:43:42 EDT 2017

```Hi

I am trying to practice the following question for my test tomorrow. Please
help me find my errors.

*Consider the following displacement sequence  [x1; x2;..... x11] and
velocity sequence  [v1; v2;....... v11]:x[k+1] = x[k]+ 0.1 v[k]v[k+1] =
v[k] - 10* x[k] + 0.1 sin(0.1* k *theta)Compute the maximum displacement
from the displacementsequence. Use theta = 1 [rad] and theinitial values x1
= 0 and v1 = 0.*

Here is my code:

x = np.zeros(11)
v = np.zeros(11)

x[0] = 1
v[0] = 1

a = np.arange(1,10,1)
for k in a:

x[k+1] = x[k] + 0.1*v[k]

v[k+1] = v[k] - 10*x[k] +0.1*sin(0.1*k*1)

print(x.max())

*This was a follow-up question with a suggested answer:Repeat the maximum
displacement computation for theta = 1; 2,3.... 20 [rad] and store the
maximum displacement for each in a list.from math import sinmax_disp =
[]omega_values = range(1, 21, 1)for omega in omega_values:        x = [0.0]
* 11    v = [0.0] * 11    for k in range(10):        x[k+1] = x[k] + 0.1 *
v[k]        v[k+1] = v[k] - 10 * x[k] + 0.1 * sin(0.1 * omega * (k + 1))
max_disp.append( max(x) )    print(max_disp)*
My question is what do the lines in red mean?