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    "# Practice Problems\n",
    "### Lecture 19\n",
    "Answer each number in a separate cell\n",
    "\n",
    "Rename the notebook with your lastName, first inital and the lecture \n",
    "    \n",
    "    ex. Cych_B_19\n",
    "    \n",
    "Turn this notebook into Canvas"
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    "## 1. Meshgrid and contour\n",
    "- Write a  lambda function for the equation \n",
    "$$ c=f(a,b)=(1-a^2+b^3) e^{-(a^2+b^2)/2}$$.\n",
    "- Create two arrays- a and b- that range from -3 to 3 in increments of 0.1.\n",
    "- Make a meshgrid from a and b.\n",
    "- Evaluate c for the meshgrid\n",
    "- Make a contour plot of a,b and c.  "
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    "## 2. Mkigrf and maps\n",
    "- Lisa moved to San Diego in 1983.    Use the  functions in the  **mkigrf** module to do the following:\n",
    "    - Calculate the inclination, declination, and strength of the field that year.\n",
    "    - Create a map of the strength of the field in 1983\n",
    "        - include coastlines\n",
    "        - a title\n",
    "        - a color bar \n",
    "    - Make a plot of declination in San Diego (33,-117) over the last 100 years. "
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