{"id":143831,"date":"2022-06-15T11:30:14","date_gmt":"2022-06-15T15:30:14","guid":{"rendered":"https:\/\/ibkrcampus.com\/?p=143831"},"modified":"2022-11-21T09:55:28","modified_gmt":"2022-11-21T14:55:28","slug":"the-brass-tacks-of-julia-programming-part-iii","status":"publish","type":"post","link":"https:\/\/www.interactivebrokers.com\/campus\/ibkr-quant-news\/the-brass-tacks-of-julia-programming-part-iii\/","title":{"rendered":"The Brass Tacks of Julia Programming \u2013 Part III"},"content":{"rendered":"\n<p><em>See&nbsp;<a href=\"\/campus\/ibkr-quant-news\/the-brass-tacks-of-julia-programming-part-i\/\">Part I<\/a>&nbsp;for instructions on basic arithmetic operations and <a href=\"\/campus\/ibkr-quant-news\/the-brass-tacks-of-julia-programming-part-ii\/\">Part II<\/a> for working with matrices<\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"using-r-and-python-code-in-julia\">Using R and Python code in Julia<\/h2>\n\n\n\n<p>There can be times where you want to use your R or Python code as the libraries to perform certain operations may not be available in Julia.<\/p>\n\n\n\n<p>However, using 2 languages to perform a certain operation can be a challenge. Hence, Julia provides an option to use R and Python code by using the \u201cPyCall\u201d and \u201cRCall\u201d packages.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"how-to-use-python-code-in-julia\">How to use Python code in Julia<\/h3>\n\n\n\n<p>Here\u2019s how you can use your Python code in Julia.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\n# Install the \"PyCall\" package for Python\nusing Pkg\nPkg.add(\"PyCall\")\nusing PyCall\n\n## Importing numpy package from Python\nnp = pyimport(\"numpy\")\n\n## Using numpy package in Julia\nnp.array(&#91;1,2,3])<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>Output:\n\n3-element Vector{Int64}:\n1\n2\n3<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"how-to-use-r-code-in-julia\">How to use R code in Julia<\/h3>\n\n\n\n<p>Let\u2019s look at an example of using R in Julia.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># Install \"RCall\" package for R\nPkg.add(\"RCall\")\nusing RCall\n\n# There are several ways to call R code\n\n# Method 1\n# Calling the mean() function from R\nrcall(:mean, &#91;1,2,3])\n\n# Method 2 for user-defined functions\nR\"\"\"\npower_4 &lt;- function(x)\n{\nreturn(x^4)\n}\"\"\"\n    \n## Calling the defined function\nrcall(:power_4, 5)<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>Output:\n\nRObject{RealSxp}\n&#91;1] 2\nRObject{RealSxp}\n&#91;1] 625<\/code><\/pre>\n\n\n\n<p>For further details on using the RCall package, you can refer&nbsp;<a href=\"https:\/\/juliainterop.github.io\/RCall.jl\/stable\/gettingstarted\/\" target=\"_blank\" rel=\"noreferrer noopener\">here.<\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"python-vs-julia-comparison-of-syntax-for-basic-operations\">Python vs Julia &#8211; Comparison of syntax for basic operations<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Feature<\/strong><\/td><td><strong>Python<\/strong><\/td><td><strong>Julia<\/strong><\/td><\/tr><tr><td>Column vector<\/td><td>[1, 2, 3]<\/td><td>[1,2,3]<\/td><\/tr><tr><td>Row vector<\/td><td>[[1], [2], [3]]<\/td><td>[1 2 3]<\/td><\/tr><tr><td>Sequence of numbers<\/td><td>range(1, 10,2)<\/td><td>[1:2:10; ]<\/td><\/tr><tr><td>Matrix<\/td><td>[[1,2] , [3,4]]<\/td><td>[1 2; 3 4]<\/td><\/tr><tr><td>Random numbers<\/td><td>np.random.rand(4,5)<\/td><td>rand(4,5)<\/td><\/tr><tr><td>Mutation<\/td><td>inplace =True<\/td><td>!<\/td><\/tr><tr><td>Matrix to vector<\/td><td>A.flatten()<\/td><td>A[:]<\/td><\/tr><tr><td>Conjugate of a matrix<\/td><td>A.conj()<\/td><td>A\u2019<\/td><\/tr><tr><td>Element wise operation<\/td><td>map()<\/td><td>.<\/td><\/tr><tr><td>Power<\/td><td>var**2<\/td><td>var^2<\/td><\/tr><tr><td>Indexing<\/td><td>Starts from 0<\/td><td>Starts from 1<\/td><\/tr><tr><td>Maximum value<\/td><td>max(A)<\/td><td>maximum(A)<\/td><\/tr><tr><td>Minimum value<\/td><td>min(A)<\/td><td>minimum(A)<\/td><\/tr><tr><td>For loop<\/td><td>for i in range(n):<br># command<\/td><td>for i in 1:n<br># command<br>end<\/td><\/tr><tr><td>While loop<\/td><td>While i &lt;=n:<\/td><td>While i &lt;=n<\/td><\/tr><tr><td>If-else<\/td><td>If i &lt;=m:<br># command<br>Else:<br>#command<\/td><td>if i &lt;=m<br># command<br>else<br># command<br>end<\/td><\/tr><tr><td>Temporary function<\/td><td>Y = lambda x: x**5<\/td><td>Y = x -&gt; x^5<\/td><\/tr><tr><td>Function<\/td><td>def func(y, x):<br>return y + 3*x<\/td><td>func(y, x) = y + 3x<br>OR<br>function func(y, x)<br>return y + 3x<br>end<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><em>Visit QuantInsti for additional insight on this article:&nbsp;<a href=\"https:\/\/blog.quantinsti.com\/julia-syntax\/\">https:\/\/blog.quantinsti.com\/julia-syntax\/<\/a><\/em>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>However, using 2 languages to perform a certain operation can be a challenge. Hence, Julia provides an option to use R and Python code by using the \u201cPyCall\u201d and \u201cRCall\u201d packages.<\/p>\n","protected":false},"author":726,"featured_media":116184,"comment_status":"closed","ping_status":"open","sticky":true,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[339,348,343,349,338,350,341,351,352,344,2197,342],"tags":[11908,806,11844,7560,11848,1006,923,11907,11906,12081,595,487,12080,6591,11845,12079],"contributors-categories":[13654],"class_list":{"0":"post-143831","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-python-development","11":"category-ibkr-quant-news","12":"category-quant-asia-pacific","13":"category-quant-development","14":"category-quant-europe","15":"category-quant-north-america","16":"category-quant-regions","17":"category-quant-south-america","18":"category-r-development","19":"tag-conditional-statements","20":"tag-data-science","21":"tag-data-structures","22":"tag-data-visualization","23":"tag-dictionaries","24":"tag-fintech","25":"tag-julia-programming","26":"tag-loops","27":"tag-matrices","28":"tag-pycall-package","29":"tag-python","30":"tag-r","31":"tag-rcall-package","32":"tag-rstats","33":"tag-strings","34":"tag-tuples-vectors","35":"contributors-categories-quantinsti"},"pp_statuses_selecting_workflow":false,"pp_workflow_action":"current","pp_status_selection":"publish","acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.9 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>The Brass Tacks of Julia Programming \u2013 Part III<\/title>\n<meta name=\"description\" content=\"However, using 2 languages to perform a certain operation can be a challenge. 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