# Practice Problems¶

### Lecture 6¶

Answer each number in a separate cell

Rename this notebook with your last name and the lecture ex. CychB_06

Turn-in this notebook on TritonEd by the end of class.

1. Numpy attributes

• print out the value of e using the np.e attribute.
2. Numpy

• Create a list of numbers ranging from 1931 to 2016
• Read in 'Datasets/rainFall/Avg_Rain.txt' in the Lecture_06 directory into an ndarray using NumPy. These data came from: the Knipling-Bushland US Livestock Insects Research Laboratory, USDA-ARS in Kerrville, Texas. The file contains total annual rainfall.
• Plot the annual average rainfall against your list of numbers.
• Label the $x$ and $y$ axes.
• What do you suppose the units of rainfall are?
3. Matplotlib.pyplot
• import matplotlib.pyplot as plt
• create a list of angles called thetas_in_radians
• Use your array thetas_in_radians to generate an array of tangents (using the appropriate NumPy function (listed in the Lecture).
• Plot this array with thetas_in_radians on the X axis and your array of tangents on the y axis. Draw the tangent with a red line.
• Try different line styles, different line widths, and colors. (look at the matplotlib.pyplot API link, or use the Python help( ) function.
• Put on axis labels and a legend. Play with the legend location.
• set the y limits to -1 and 1
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