Julia_BasicsA.ipynb.txt - "cells"cell_type"markdown"metadata"collapsed true"hide_input true"source Part 1 Using Julia as a Glorified Calculator\n\n

# Julia_BasicsA.ipynb.txt -...

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{ "cells": [ { "cell_type": "markdown", "metadata": { "collapsed": true, "hide_input": true }, "source": [ "# Part 1: Using Julia as a Glorified Calculator\n", "\n", "## Basics\n", "\n", "Julia can be used like a whole bunch of different programms to do basic arithmetic" ] }, { "cell_type": "code", "execution_count": 4, "metadata": {}, "outputs": [ { "data": { "text/plain": [ "2" ] }, "execution_count": 4, "metadata": {}, "output_type": "execute_result" } ], "source": [ "# Addition\n", "\n", "1+1" ] }, { "cell_type": "code", "execution_count": 5, "metadata": {}, "outputs": [ { "data": { "text/plain": [ "3" ] }, "execution_count": 5, "metadata": {}, "output_type": "execute_result" } ], "source": [ "# Subtraction\n", "\n", "4-1 " ] }, { "cell_type": "code", "execution_count": 6,

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"metadata": {}, "outputs": [ { "data": { "text/plain": [ "15" ] }, "execution_count": 6, "metadata": {}, "output_type": "execute_result" } ], "source": [ "# Multiplication\n", "\n", "5*3" ] }, { "cell_type": "code", "execution_count": 7, "metadata": {}, "outputs": [ { "data": { "text/plain": [ "2.0" ] }, "execution_count": 7, "metadata": {}, "output_type": "execute_result" } ], "source": [ "# Division\n", "6/3 " ] }, { "cell_type": "code", "execution_count": 8, "metadata": {}, "outputs": [ { "data": { "text/plain": [ "8" ] }, "execution_count": 8, "metadata": {}, "output_type": "execute_result" } ], "source": [ "# Raising a number to a power\n", "\n", "2^3" ] }, { "cell_type": "code",
"execution_count": 9, "metadata": {}, "outputs": [ { "data": { "text/plain": [ "2.0" ] }, "execution_count": 9, "metadata": {}, "output_type": "execute_result" } ], "source": [ "# Square Root\n", "\n", "sqrt(4)" ] }, { "cell_type": "code", "execution_count": 10, "metadata": {}, "outputs": [ { "data": { "text/plain": [ "π = 3.1415926535897..." ] }, "execution_count": 10, "metadata": {}, "output_type": "execute_result" } ], "source": [ "# Special number pi\n", "pi" ] }, { "cell_type": "code", "execution_count": 11, "metadata": {}, "outputs": [ { "data": { "text/plain": [ "e = 2.7182818284590..." ] }, "execution_count": 11, "metadata": {}, "output_type": "execute_result" } ], "source": [ "# Special number e=exp(1)\n", "e" ] }, { "cell_type": "markdown",

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"metadata": {}, "source": [ "## Arrays\n", "\n", "We can also do calculations on lots of numbers at once. The first of these are arrays.\n", "\n", "Arrays are essentially just collections of numbers in a table. We'll use these a lot later on, when we talk about matrices and vectors.\n", "\n", "To write an array, simply write a list of numbers separated by spaces or semicolons (;), surrounded by square brackets ([ ])" ] }, { "cell_type": "code", "execution_count": 1, "metadata": {}, "outputs": [ { "data": { "text/plain": [ "5-element Array{Int64,1}:\n", " 1\n", " 2\n", " 3\n", " 4\n", " 5" ] }, "execution_count": 1, "metadata": {}, "output_type": "execute_result" } ], "source": [ "# If you use semicolons, you get a result in a single column\n", "\n", "# We'll introduce variables (this x= business) in a minute\n", "x = [1;2;3;4;5]" ] }, { "cell_type": "code", "execution_count": 24, "metadata": {}, "outputs": [ { "data": { "text/plain": [ "1×5 Array{Int64,2}:\n", " 1 2 3 4 5" ] }, "execution_count": 24, "metadata": {}, "output_type": "execute_result" } ], "source": [ "# If you use spaces, you get results in a single row\n", "y=[1 2 3 4 5]" ] },
{ "cell_type": "code", "execution_count": 3, "metadata": {}, "outputs": [ { "data": { "text/plain": [ "2×3 Array{Int64,2}:\n", " 1 2 3\n", " 4 5 6" ] }, "execution_count": 3, "metadata": {}, "output_type": "execute_result" } ], "source": [ "# We can use spaces and semicolons to make tables of numbers:\n", "\n", "z = [1 2 3 ; 4 5 6]" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "If we want to get a particular cell of the array z, we can call it using z[row,column] like:" ] }, { "cell_type": "code", "execution_count": 4, "metadata": {}, "outputs": [ { "data": { "text/plain": [ "6" ] }, "execution_count": 4, "metadata": {}, "output_type": "execute_result" } ], "source": [ "z[2,3]" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "On top of that, we can also change values stored in particular cells:" ] }, { "cell_type": "code", "execution_count": 5, "metadata": {}, "outputs": [

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{ "data": {
• Spring '12
• Boman

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