# Practice Problems¶

### Lecture 19¶

Answer each number in a separate cell

Rename the notebook with your lastName and the lecture

ex. CychB_19



Turn this notebook into TritonEd by the end of class

# 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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