Julia_forloopguide.ipynb.txt - "cells"cell_type"markdown"metadata"source A quick guide to for loops\n\n"Computers are very good at doing dumb things

Julia_forloopguide.ipynb.txt -...

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{ "cells": [ { "cell_type": "markdown", "metadata": {}, "source": [ "# A quick guide to for loops\n", "\n", "Computers are very good at doing dumb things very quickly. We use this all the time to make computers do all sorts of things for us.\n", "\n", "One of the fundamental things that happens behind the scenes in most places is something called a for loop. A for loop says \"here's a bunch of values for some variable n\". For every value, repeat these steps that I tell you to.\n", "\n", "Here's a toy example:" ] }, { "cell_type": "code", "execution_count": 1, "metadata": {}, "outputs": [ { "name": "stdout", "output_type": "stream", "text": [ "1\n", "2\n", "3\n", "4\n", "5\n", "6\n", "7\n", "8\n", "9\n", "10\n" ] } ], "source": [ "for i in 1:10 # For the numbers 1 to 10 (stored in the variable i as it runs)\n", " println(i) # Print i and move to a new line\n", "end" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "Here, we just printed i over and over again. However, think back to the capital sigma notation from the lecture. It's just doing the same thing, repeating a basic step (add this value) over and over again. We can use a for loop to do this as well:" ] }, { "cell_type": "code",
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  • Spring '12
  • Boman
  • Interior, loop, Rochester, New York

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