gistfile1.txt

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    "# Exploratory Computing with Python\n",
    "*Developed by Mark Bakker*\n",
    "## Notebook 6 : Individual Notebook Wednesday\n",
    "### Enter your name, studienummer and date of birth below"
   ]
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    "print('Name: xxx')\n",
    "print('Studienummer: xxx')\n",
    "print('Date of birth: xxx')"
   ]
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    "### Exercise 1\n",
    "\n",
    "Write a function that plots a square centered at the origin. The length of the side of the square is $L$. The input of the function is the length $L$. \n",
    "\n",
    "Next, write a loop that calls your function for $L$ going from 1 up to and including 5 with steps of 1. \n",
    "Use `plt.axis('scaled')` to make sure your squares look like squares and not rectangles."
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    "### Exercise 2\n",
    "Write a function called `countsquares` that takes as input the filename of a file that consists of a bunch of numbers separated by spaces. Inside the function, you must first read the numbers from the filename and then you must  determine how many of these numbers are a perfect square. A perfect square means that the root of the number is an integer (i.e., 1, 4, 16, 25, etc.). The function returns the number of perfect squares in the file. Note: to convert a number to an integer, use the `int` function. \n",
    "\n",
    "Demonstrate that your function works by using the file `numbers2016.txt` and execute the following line of code:\n",
    "\n",
    "`print(countsquares('numbers2016.txt'), 'numbers are perfect squares')`"
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    "### Exercise 3\n",
    "The file `quiz_answers.dat` contains the result of a small multiple-choice quiz with 8 questions. Every row contains the 8 answers to the quiz of one of the students. Your job is to count how many students had the correct answer for each question. Write a double loop to compute the number of correct answers for each question and present the results in a bar graph.  The correct answers for the 8 questions of the quiz are: `a b c d a b c d`"
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    "### Exercise 4\n",
    "In the image below, you can see a possible future for the American flag if some of the American states leave the Union like the Brexit of England. Create a matrix of 13 rows and 20 columns. Create the red and white stripes plus the blue rectangle by assigning 0 (blue), 1 (white), and 2 (red) using at most three assignent statements. Show the matrix to the screen using the `bwr` colormap, and add the row of 9 stars by plotting markers with the `plt.plot` statement. \n",
    "\n",
    "Finally, add the line `plt.axis('image')` to your script, so the flag covers up your entire plot (no white banners). \n",
    "![](american_flag_brexit.png)"
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    "### Exercise 5\n",
    "Write a function that computes the percentage of grades that is above a given value. The function takes as input arguments an array with grades between 1 and 10 and a minimum value and returns the precentage of grades (so between 0% and 100%) that are above or equal to that value. Demonstrate that your function works by loading the grades in the file `schoolgrades2016.txt` and print the result of the function to the screen, given a minimum value of 7."
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