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   "source": [
    "# 2.18 Programming for Geoscientists class test - 14:00-16:00 18th December 2014"
   ]
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    "#Test instructions\n",
    "\n",
    "* This test contains **5** questions each of which should be answered.\n",
    "* Write your program in a Python cell just under each question.\n",
    "* You can write an explanation of your solution as comments in your code.\n",
    "* In each case your solution program must fulfil all of the instructions - please check the instructions carefully and double check that your program fulfils all of the given instructions.\n",
    "* Save your work regularly.\n",
    "* At the end of the test you should email your IPython notebook document (i.e. this document) to [Gerard J. Gorman](http://www.imperial.ac.uk/people/g.gorman) at g.gorman@imperial.ac.uk"
   ]
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   "source": [
    "**Question 1** \n",
    "\n",
    "* Correct the 5 errors in the following program.\n",
    "* In each case add a comment explaining the error and the fix.\n",
    "* To verify your answer remember that $sin ^2( x ) + cos ^2( x ) = 1$."
   ]
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  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
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   "source": [
    "from math import sin, cos\n",
    "x = pi /4\n",
    "1_val = sin^2( x ) + cos^2( x )\n",
    "print 1_VAL"
   ]
  },
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   "metadata": {},
   "source": [
    "**Question 2**\n",
    "\n",
    "* Create a python list containing 101 evenly spaced values between -1.0 and 1.0.\n",
    "* Show how this could be more efficently done using NumPy.\n",
    "* Print out the values using a formatted print statement."
   ]
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   "source": [
    "**Question 3**\n",
    "\n",
    "* a. Write a python function that evaluates the equation below for input variables $x$ and $t$: $$f(x, t) = e^{-(x-3t)^2} \\sin \\left( 3\\pi \\left( x-t \\right) \\right)$$\n",
    "* b. Generate an array of $x$ values in the range $[-3.0, 10]$.\n",
    "* c. Using this array of x values, plot the function for $t=0.0$, $t=1.0$ and $t=2.0$."
   ]
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   "source": [
    "**Question 4**\n",
    "\n",
    "* Write a program to read the data file [seismic.dat](https://raw.githubusercontent.com/ggorman/Introduction-to-programming-for-geoscientists/master/notebook/data/seismic.dat) and store the magnitude of the earthquakes (*i.e.* the last column) in an numpy array.\n",
    "* How many earthquakes are there above magnitude 6.0?"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": false
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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Question 5** The file [human_evolution.txt](https://raw.githubusercontent.com/ggorman/Introduction-to-programming-for-geoscientists/master/notebook/data/human_evolution.txt) holds information about various human species and their hight, weight, and brain volume. \n",
    "\n",
    "* Write a program that reads this file and stores the data in a python dictionary humans.\n",
    "* The dictionary key should correspond to the specie name (e.g., “homo erectus”), and the value should be a list containing the corresponding data. For example, humans[\"H. habilis\"] should give [\"2.2 - 1.6\", \"1.0 – 1.5\", \"33 – 55\", \"660\"].\n",
    "* Write out the humans dictionary in a formatted tabular form."
   ]
  },
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   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": false
   },
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