Class Overview

Today we will work on two things.

1.  We are going to solve equation of a line and then plot it).
   1. Work together to do it by hand.
   2. This is “easy” and you have done it many of times.  But it can be hard for your brain to convert to python.
   3. Then each person will implement it themselves.
2. Then we are going to work on For loops (pdf=for-loops).
   1. Here is some reading on for loops.  http://www.tutorialspoint.com/python/python_for_loop.htm
3. Today’s files are at

VIDEO

Quiz is on courseworks for the video!

Homework 4 Due Monday February 10, 2025

QUESTION 1

Use 2 nested for loops.  This is a for loop inside a for loop.  Count up in the outer for loop from 0 to 9 and then at every step count back down to zero.  Remember that in np.arange(start,stop,skip).  You give it a start,stop, and skip.  We usually put numbers in.  But you don’t have to add numbers you could put a parameter in.  Add spaces like below.

Answer Question 1.

i= 0
k= 0

i= 1
k= 1
k= 0

i= 2
k= 2
k= 1
k= 0

i= 3
k= 3
k= 2
k= 1
k= 0

i= 4
k= 4
k= 3
k= 2
k= 1
k= 0

i= 5
k= 5
k= 4
k= 3
k= 2
k= 1
k= 0

i= 6
k= 6
k= 5
k= 4
k= 3
k= 2
k= 1
k= 0

i= 7
k= 7
k= 6
k= 5
k= 4
k= 3
k= 2
k= 1
k= 0

i= 8
k= 8
k= 7
k= 6
k= 5
k= 4
k= 3
k= 2
k= 1
k= 0

i= 9
k= 9
k= 8
k= 7
k= 6
k= 5
k= 4
k= 3
k= 2
k= 1
k= 0

QUESTION 2.

Go back and get the monthly precipitation from central park we used in class 3 (NOT class 1).  Remember that we used this data when we were learning about lists and learning how to make plots.   Use a for loop and sum up the monthly data.  Then call the function sum on your data.  It will be np.sum(precip_list).  How do they compare?

Answer Question 2.

For loop sum= 45.13

sum function sum= 45.13

QUESTION 4.

Using np.arange or np.linspace and a for loop to recreate what is below.  Remember that np.sin takes radians and not degrees. You can convert yourself or use the function np.deg2rad().  Also, I wrote out degrees and did not use the symbol because latex does not show up in print statements but it does on graphs.  Don’t forget what you learned about format statements a few classes ago to get all the decimals correct.

Final 10%

Fun with two for loops, line breaks, new lines, and np.arange.  Can you make the pattern below?  Remember you can do math in np.arange.