#!/usr/bin/env python
# coding: utf-8

# # Practice Problems
# ### Lecture 8
# Answer each number in a separate cell
# 
# Rename this notebook with your last name and the lecture 
#  
#  ex. Cych_B_08
#     
# Turn-in this notebook on Canvas.  

# 1.  Adding notes in matplotlib.pyplot
#     - Similar to the lecture:
#         - Read the file 'Datasets/seismicRecord/earthquake.txt'into a pandas DataFrame
#         - Change the units of the x-axis to time in minutes
#     - Make a plot of velocity against time
#         - Include a label for the x and y-axis. 
#         - Plot the line red
#         - Use **help( )** to learn about the matplotlib function **title( )** then add this title: 'Earthquake observed at Pinyon Flat Observatory'
#     - Add a note
#         - Place the note at x = 4 and y = 170000 
#         - Write the text 'P-S delay interval'
#         - Color the text blue
#         - rotate the text so that it is vertical (hint: use rotation = 90)
# 2. Panda DataFrames
#     - Import the file 'Datasets/TravelTimeDelta/DeltaTime.txt' into a panda DataFrame
#     - Get acquainted with the DataFrame:
#         - print out the name of the columns
#         - print out the first few lines of the DataFrame
#         - change the column headers 
#         - print out the new column headers
#     - Convert the P wave arrival from minutes and seconds to decimal minutes. Add the P wave arrival, in decimal minutes, to the data frame
#     - Calculate the S wave arrival by:
#         1. Converting S-P to decimal minutes
#         2. Adding P in decimal minutes to S-P in decimal minutes
#      
# 3. Additional matplotlib.pyplot practice
#     - Plot Degrees against decimal minutes for both the Primary wave arrival and the Secondary wave arrival
#     - Color the primary wave green and label it "P wave"
#     - Color the shear wave blue and label it "Shear wave"
#     - Add a legend in the lower right hand corner of your figure 
#     - Add a title to your figure 
#     - Add a label to the x and y axis 
#     - Save the figure
#     - Remove the legend from your plot. Insert the text  "Primary wave" and "Shear wave" above the appropriate line
#     - Save the new figure

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