Homework, Material, and Software Manual for Math 4610
Routine Name: norm2vec
Author: Tanner Wheeler
Language: Python. This code can be run on a python 3 compiler. The file can be imported and then the method will run.
Description/Purpose: This code will compute the l_2 norm of a vector. This can be run for any size of vector with integer, float, and double values. The package math will need to be imported as shown in the implementation section.
Input: The first input for this method is a 1 dimensional vector/list of numbers. The second input is the length of the vector.
Output: This routine returns a double precision value for the l_2 norm.
Usage/Example:
First let’s create a vector c of size 3 and set each element to a specific number.
c = [float(0) for i in range(0, 3)]
c[0] = 1.5
c[1] = 9.4
c[2] = 3.3
Now let’s print out the value return from our function given our created vector.
print(norm2vec(c, 3))
This would print
10.074720839804943
to the console.
Implementation/Code: The following is the code for norm2vec(x, m)
import math
def norm2vec(x, m):
numSum = 0.0
for i in range(m):
numSum = numSum + (abs(x[i])**2)
return math.sqrt(numSum)
Last Modified: Dec 14, 2018