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

# # Practice Problems
# ### Lecture 19
# Answer each number in a separate cell
# 
# Rename the notebook with your lastName, first inital and the lecture 
#     
#     ex. Cych_B_19
#     
# Turn this notebook into Canvas

# ## 1. Meshgrid and contour
# - Write a  lambda function for the equation 
# $$ c=f(a,b)=(1-a^2+b^3) e^{-(a^2+b^2)/2}$$.
# - Create two arrays- a and b- that range from -3 to 3 in increments of 0.1.
# - Make a meshgrid from a and b.
# - Evaluate c for the meshgrid
# - Make a contour plot of a,b and c.  

# ## 2. Mkigrf and maps
# - Lisa moved to San Diego in 1983.    Use the  functions in the  **mkigrf** module to do the following:
#     - Calculate the inclination, declination, and strength of the field that year.
#     - Create a map of the strength of the field in 1983
#         - include coastlines
#         - a title
#         - a color bar 
#     - Make a plot of declination in San Diego (33,-117) over the last 100 years. 

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