Assignment 3¶

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If you have installed Python locally, launch JupyterLab by running:

conda activate sds

and

jupyter lab

Task 1 (5 points)¶

array = np.array([[[178, 189, 567], [145, 239, 445], [197, 345, 678]], [[56, 78, 190], [46, 10, 11], [6, 2, 1]], [[45, 118, 203], [72, 119, 34], [87, 9, 5]]])

Copy and paste this array into your notebook and answer the following questions:

a) How many dimensions does this array have?
b) What is the mean and standard deviation of this array?
c) How many values are less than 10?
d) What is the index of the highest value? Looking for three numbers here (i.e. an index for each dimension).

Click to reveal hint

The np.where() function is useful for this task.

e) What is the index of the lowest value?

Task 2 (5 points)¶

a) Define a list containing the names of five cities (as strings).
b) Define two NumPy arrays (i.e. np.array()), one called lat and one called lon, that contain the latitudes and longitudes, respectively, of five global cities to two decimal places.
c) Print the name and latitude of the most northerly city using f-string formatting.
d) Repeat for the for city with the most westerly longitude.
e) Print the mean latitude and mean longitude of your five cities to two decimal places.

Geographic coordinates for your cities can be found from this website.

Task 3 (10 points)¶

a) Write a for loop that prints each city followed by its latitude and longitude (two decimal places).
b) Write a for loop that converts every character of your cities to uppercase.

Hint

Look for the string method you need here

c) Write a for loop that counts the number of characters of each city and saves it to a new list.
d) Write a for loop that prints the name of the city, only if its more northerly than the mean latitude of all your cities (i.e. np.mean(lat))

Extra credit (2 points)¶

Write a for loop that counts the number of vowels in each city.

Click to reveal hint

The count() method is useful for this task.

Task 4 (5 points)¶

a) Combine a for loop with a conditional statement that returns True for every city that is located in the Northern Hemisphere (and False if not).

Make a new list of containing the countries and continents of your cities.

b) Combine a for loop with a conditional statement that returns True for every city that is not located in Asia (and False if not).
c) Combine a for loop with a conditional statement that returns True for every city that is located in the USA (and False if not).

Task 5 (5 points)¶

Here is a list of daily river discharges for July.

discharge = np.array([0.3, 0.2, 1.6, 2.3, 0.8, 1.5, 1.5, 0.1, 2.2, 1.4,
       1.5, 1.5, 0.9, 2.2, 2.8, 2.6, 2.8, 2.8, 0.6, 2.8, 2.1, 1.0, 1.0, 
       0.3, 1.6, 0.4, 1.5, 0.2, 0.9, 1.5])

Our messenger can wade across river when it is flowing at less than 1 cubic meter per second.

Our messenger can boat across the river when it is flowing between 1 and 2 cubic meters per second.

Our messenger cannot cross the river if it is flowing greater than 3 cubic meters per second.

a) Compute how many days our messenger can travel across the river by foot using a for loop and conditional statements
b) Compute how many days our messenger can travel across the river by boat using a for loop and conditional statements

Important

Save your notebook to your local course folder and submit assignment (in .pdf format) to Canvas by the deadline.

Programming for spatial data science

Assignment 3

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