{"id":134285,"date":"2022-04-20T20:30:00","date_gmt":"2022-04-21T00:30:00","guid":{"rendered":"https:\/\/ibkrcampus.com\/?p=134285"},"modified":"2022-11-21T09:53:45","modified_gmt":"2022-11-21T14:53:45","slug":"data-manipulation-and-visualization-techniques-in-julia-part-ii","status":"publish","type":"post","link":"https:\/\/www.interactivebrokers.com\/campus\/ibkr-quant-news\/data-manipulation-and-visualization-techniques-in-julia-part-ii\/","title":{"rendered":"Data Manipulation and Visualization Techniques in Julia \u2013 Part II"},"content":{"rendered":"\n<p><em>Learn how to create new dataframes with <a href=\"\/campus\/ibkr-quant-news\/data-manipulation-and-visualization-techniques-in-julia-part-i\/\">Part I<\/a>.<\/em><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"basic-mathematical-operations\">Basic mathematical operations<\/h3>\n\n\n\n<p>As discussed in my previous post, basic arithmetic operations can be performed on individual columns.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># Subtraction\ndf_2.a - df_2.b<\/code><\/pre>\n\n\n\n<p><a href=\"https:\/\/gist.github.com\/quantra-go-algo\/0ad41aa3c345acbbe19d0e8af4875c18#file-subtraction-jl\" target=\"_blank\" rel=\"noreferrer noopener\">subtraction.jl&nbsp;<\/a>hosted with \u2764 by&nbsp;<a href=\"https:\/\/github.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">GitHub<\/a><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10-element Vector{Float64}:\n\n-0.5474996670806442\n 0.5174063588946236\n-0.564150142575268\n 0.12873854328766576\n 0.2741519215981265\n 0.20241852864291987\n 0.09324017568958975\n-0.41716724316286524\n 0.2693306887583933\n-0.5967498723478988<\/code><\/pre>\n\n\n\n<p>You\u2019ll have to use the \u201c.\u201d operator for element-wise division.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>df_2.&#91;\"a\"] .\/ df_2&#91;\"b\"] <\/code><\/pre>\n\n\n\n<p><a href=\"https:\/\/gist.github.com\/quantra-go-algo\/3cd2cdf6749784f1df158e7591b356a6#file-elementwise-operation-jl\" target=\"_blank\" rel=\"noreferrer noopener\">elementwise operation.jl&nbsp;<\/a>hosted with \u2764 by&nbsp;<a href=\"https:\/\/github.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">GitHub<\/a><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10-element Vector{Float64}:\n\n0.06754620232737023\n3.013387340201863\n0.4169119702423886\n1.2293455286486041\n1.4462537614868343\n8.482279426917298\n1.1103752688515762\n0.21238611891693882\n3.1244976300403002\n0.38733760512833965<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"basic-operations\">Basic operations<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"rearranging-columns\">Rearranging columns<\/h3>\n\n\n\n<p>r\u201d is a regex search string. Here, any column with a string \u201cwork\u201d will be selected and moved to the first place. You can write the full column name as well.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>## Method to rearrange columns in a dataframe\nselect!(df_1, r\"work\", :)<\/code><\/pre>\n\n\n\n<p><a href=\"https:\/\/gist.github.com\/quantra-go-algo\/b053ca921b77c4e985b9fa84bbf470a2#file-rearranging-columns-jl\" target=\"_blank\" rel=\"noreferrer noopener\">rearranging columns.jl&nbsp;<\/a>hosted with \u2764 by&nbsp;<a href=\"https:\/\/github.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">GitHub<\/a><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>work experience<\/th><th>name<\/th><th>team<\/th><\/tr><tr><th>Int64<\/th><th>String<\/th><th>String<\/th><\/tr><\/thead><tbody><tr><td>15<\/td><td>Vivek<\/td><td>EPAT<\/td><\/tr><tr><td>8<\/td><td>Viraj<\/td><td>Marketing<\/td><\/tr><tr><td>7<\/td><td>Rohan<\/td><td>Sales<\/td><\/tr><tr><td>10<\/td><td>Ishan<\/td><td>Quantra<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"adding-a-new-column-in-a-dataframe\">Adding a new column in a dataframe<\/h3>\n\n\n\n<p>Here we add another column, \u201cc\u201d, to the dataframe df_2.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>df_2.c = rand(10)\ndf_2<\/code><\/pre>\n\n\n\n<p><a href=\"https:\/\/gist.github.com\/quantra-go-algo\/4b6acbad613399ac125b8a2cb09e0a7b#file-adding-new-column-jl\" target=\"_blank\" rel=\"noreferrer noopener\">adding new column.jl&nbsp;<\/a>hosted with \u2764 by&nbsp;<a href=\"https:\/\/github.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">GitHub<\/a><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>a<\/th><th>b<\/th><th>c<\/th><\/tr><tr><th>Float64<\/th><th>Float64<\/th><th>Float64<\/th><\/tr><\/thead><tbody><tr><td>0.845011<\/td><td>0.720306<\/td><td>0.962749<\/td><\/tr><tr><td>0.647665<\/td><td>0.0409036<\/td><td>0.10846<\/td><\/tr><tr><td>0.427267<\/td><td>0.221369<\/td><td>0.197592<\/td><\/tr><tr><td>0.413642<\/td><td>0.374832<\/td><td>0.967406<\/td><\/tr><tr><td>0.477994<\/td><td>0.118461<\/td><td>0.0233091<\/td><\/tr><tr><td>0.0849006<\/td><td>0.157679<\/td><td>0.936764<\/td><\/tr><tr><td>0.0477405<\/td><td>0.845332<\/td><td>0.296003<\/td><\/tr><tr><td>0.518909<\/td><td>0.159305<\/td><td>0.514714<\/td><\/tr><tr><td>0.93499<\/td><td>0.259579<\/td><td>0.620951<\/td><\/tr><tr><td>0.60034<\/td><td>0.115911<\/td><td>0.0224133<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Dataframe-to-matrix conversion<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>Matrix(df_2)<\/code><\/pre>\n\n\n\n<p><a href=\"https:\/\/gist.github.com\/quantra-go-algo\/f9cef24088df15b1a70e82f1df48e8d2#file-dataframe-to-matrix-jl\" target=\"_blank\" rel=\"noreferrer noopener\">dataframe to matrix.jl&nbsp;<\/a>hosted with \u2764 by&nbsp;<a href=\"https:\/\/github.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">GitHub<\/a><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>10\u00d73 Matrix{Float64}:\n\n0.0396604  0.58716    0.741712\n0.774389   0.256983   0.429361\n0.403371   0.967521   0.989583\n0.690069   0.56133    0.50599\n0.888493   0.614341   0.152574\n0.229472   0.0270531  0.932589\n0.937996   0.844756   0.0745573\n0.112492   0.52966    0.712178\n0.396105   0.126774   0.397762\n0.377277   0.974027   0.685073<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<p><em>Visit QuantInsti to read the full article:&nbsp;<a href=\"https:\/\/blog.quantinsti.com\/data-manipulation-visualization-using-julia\/\">https:\/\/blog.quantinsti.com\/data-manipulation-visualization-using-julia\/<\/a>.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Basic arithmetic operations can be performed on individual columns.<\/p>\n","protected":false},"author":726,"featured_media":100567,"comment_status":"closed","ping_status":"open","sticky":true,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[339,348,343,338,350,341,344],"tags":[11504,806,5479,4922,923],"contributors-categories":[13654],"class_list":{"0":"post-134285","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-data-science","8":"category-julia-development","9":"category-programing-languages","10":"category-ibkr-quant-news","11":"category-quant-asia-pacific","12":"category-quant-development","13":"category-quant-regions","14":"tag-data-manipulation","15":"tag-data-science","16":"tag-data-visualisation","17":"tag-econometrics","18":"tag-julia-programming","19":"contributors-categories-quantinsti"},"pp_statuses_selecting_workflow":false,"pp_workflow_action":"current","pp_status_selection":"publish","acf":[],"yoast_head":"<!-- This site is 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