3.7.3.2. Exercise: Looping using for and range 2#
Redo Exercise: Looping using while 1, this time using a for loop instead of a while loop:
Using an instrumented walkway, we recorded the following positions of heel strike, first for the right heel, then for the left heel, then for the right heel, and so on according to Fig. 3.7.
# y-coordinates of each heel strike, in meters
y = [0.13, 0.72, 1.29, 1.93, 2.55, 3.12, 3.71, 4.34, 4.95, 5.56]
Write a program that creates a list named step_lengths which contains the length of every step. The first step length should be y[1] - y[0], the second should be y[2] - y[1], and so on. In this specific example, we recorded nine steps, but your code should work on any number of steps.
Show code cell content
# y-coordinates of each heel strike, in meters
y = [0.13, 0.72, 1.29, 1.93, 2.55, 3.12, 3.71, 4.34, 4.95, 5.56]
# Initialize an empty list to put the results of our calculations
step_lengths = []
# Count the number of steps in this set of data
n_steps = len(y) - 1
# Calculate the step lengths
for i in range(n_steps):
step_lengths.append(y[i + 1] - y[i])
# Done!
step_lengths
[0.59,
0.5700000000000001,
0.6399999999999999,
0.6199999999999999,
0.5700000000000003,
0.5899999999999999,
0.6299999999999999,
0.6100000000000003,
0.6099999999999994]