{"id":183377,"date":"2022-12-22T15:17:00","date_gmt":"2022-12-22T20:17:00","guid":{"rendered":"https:\/\/ibkrcampus.com\/traders-insight\/rjava-with-user-defined-r-functions-in-eclipse\/"},"modified":"2024-08-13T16:07:02","modified_gmt":"2024-08-13T20:07:02","slug":"rjava-with-user-defined-r-functions-in-eclipse","status":"publish","type":"post","link":"https:\/\/www.interactivebrokers.com\/campus\/ibkr-quant-news\/rjava-with-user-defined-r-functions-in-eclipse\/","title":{"rendered":"rJava with User-defined R Functions in Eclipse"},"content":{"rendered":"\n<p>This post shows how to call&nbsp;<strong>user-defined functions in R script<\/strong>&nbsp;from&nbsp;<strong>Eclipse<\/strong>&nbsp;Java with&nbsp;<strong>rJava<\/strong>&nbsp;package. This work will improve code readability and minimize the likelihood of errors in such a way that it reduces multiples lines of R codes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-introduction\">Introduction<\/h3>\n\n\n\n<p>We&#8217;ve learned how to insert R commands to Eclipse Java in the previous post. But as the number of lines of R commands is too many, overall code readability and maintenance could be deteriorated. In this case, it is preferred to use R script which contains user-defined or built-in R functions. This means that essentially one line of code will do rather than multiple lines of commands.<\/p>\n\n\n\n<p>Suppose that we perform Lasso regression in Java using R script.<\/p>\n\n\n\n<p>For detailed information regarding the first environment setting and Lasso model, refer to the following post.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/kiandlee.blogspot.com\/2021\/06\/using-r-code-in-java-eclipse-with-rjava.html\" rel=\"noreferrer noopener\" target=\"_blank\">Overall Environment Settings: Using R code in Java Eclipse with rJava<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/kiandlee.blogspot.com\/2021\/05\/lasso-regression-model-with-r-code.html\" rel=\"noreferrer noopener\" target=\"_blank\">Lasso Regression Model with R code<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/kiandlee.blogspot.com\/2021\/05\/sign-constrained-lasso-with-r-code.html\" rel=\"noreferrer noopener\" target=\"_blank\">Sign Constrained Lasso with R code<\/a><\/li>\n<\/ul>\n\n\n\n<p>Before going into the details, overall setting for rJava in Eclipse is required, which is discussed in the previous post.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-functions-in-r-script-to-be-called\">Functions in R Script to be Called<\/h3>\n\n\n\n<p>R scripts for Lasso estimation is written as a separate file. In particular,&nbsp;<strong>glmnet<\/strong>&nbsp;package is used. Like this, when using another package library, one more rJava command is also needed, which is discussed later.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>shlee_RLib.R<\/strong><\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>library(glmnet)\n \ntest_glmnet &lt;- function(nvar) {\n    \n    # artificial data\n    x = matrix(rnorm(100*nvar), 100, nvar)\n    y = rnorm(100)\n    \n    # Lasso estimation\n    fit1 = glmnet(x, y, alpha = 1)\n    \n    # coefficient matrix with lambda = 0.01, 0.05\n    sm.coef &lt;- as.matrix(unlist(coef(fit1, s=c(0.01,0.05))))\n \n    return(as.matrix(sm.coef))\n}<\/code><\/pre>\n\n\n\n<p>With&nbsp;<strong>source()<\/strong>&nbsp;command, test_glmnet() function in shlee_RLib.R (or your favorite name) can be called in another R script as follows.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>rm(list = ls()) # remove all files from your workspace\n \nsource(\"D:\/SHLEE\/rJava\/code\/shlee_RLib.R\")\n \ntest_glmnet(10)<\/code><\/pre>\n\n\n\n<p>test_glmnet(10) command returns the following results, which are coefficient vectors of two Lasso models (\u03bb=0.01,0.05).<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&gt; test_glmnet(10)\n                      1            2\n(Intercept) -0.16453256 -0.159861599\nV1          -0.22338346 -0.179309971\nV2          -0.01422389  0.000000000\nV3           0.03766415  0.000000000\nV4           0.03100075  0.000000000\nV5          -0.03618045 -0.003826916\nV6           0.06392980  0.021847332\nV7           0.05765196  0.022836526\nV8           0.02248489  0.000000000\nV9          -0.09365914 -0.046769476\nV10         -0.19398003 -0.180170304\n&gt; \n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Calling User-defined Functions in Eclipse Java<\/h3>\n\n\n\n<p>At first, let&#8217;s make an Eclipse class java file in which R functions are called using rJava. We name it CRJava2.java for example. In this file, write the following java code.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>CRjava2.java<\/strong><\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/=========================================================================#\n\/\/Financial Econometrics &amp; Derivatives, ML\/DL using R, Python, Tensorflow  \n\/\/by Sang-Heon Lee \n\/\/\n\/\/https:\/\/kiandlee.blogspot.com\n\/\/-------------------------------------------------------------------------#\n\/\/rJava example with user-defined function which reduces so much lines.\n\/\/=========================================================================#\npackage aRjava;\n \nimport org.rosuda.JRI.Rengine;\nimport org.rosuda.JRI.REXP;\n \n\/\/ Run Config -&gt; Environment 3 copy and paste\n\/\/ That's all there is to it and nothing else is needed.\n \npublic class CRjava2 {\n    public static void main(String&#91;] args) {\n \n        \/\/ Launch and Start rJava\n        Rengine re=new Rengine(new String&#91;] { \"--vanilla\" }, false, null);\n \n        \/\/------------------------------------------------------------------\n        \/\/ Very Important !!!!!!!!!!!!!!!!!!\n        \/\/------------------------------------------------------------------\n        \/\/ User-defined function use glmnet library.\n        \/\/\n        \/\/ Without this command, Java produces the following error.\n        \/\/ :: Error in library(glmnet) : \n        \/\/    there is no package called 'glmnet'\n        \/\/\n        \/\/ To sidestep this error, following command is recommended.\n        \/\/\n        \/\/ glmnet package is located \n        \/\/ at C:\/Users\/shlee\/Documents\/R\/win-library\/4.0\n        \/\/------------------------------------------------------------------\n        re.eval(\".libPaths('C:\/Users\/shlee\/Documents\/R\/win-library\/4.0')\");\n \n        \/\/ R file with its local directory\n        \/\/ in which user-defined functions are written\n        re.eval(\"source('D:\/SHLEE\/rJava\/code\/shlee_rlib.R')\");\n \n        \/\/ Input parameters\n        int nvar = 5; int ncol = 2;\n \n        \/\/ Call user-defined R function\n        REXP x = re.eval(\"test_glmnet(\"+nvar+\")\");\n \n        \/\/ 1) Result : raw output\n        System.out.println(\"1) REXP result : raw output\");\n        System.out.println(x);\n \n        \/\/ 2) Results : rounded output\n        System.out.println(\"n2) REXP result : formatted output using 2D array\");\n \n        \/\/ R matrix t --&gt; Java 2D array\n        double&#91;]&#91;] mout = x.asDoubleMatrix();\n \n        for(int i = 0; i&lt;nvar; i++) {\n            for(int j = 0; j&lt;ncol; j++) {\n                System.out.print(String.format(\"%2.5f\", mout&#91;i]&#91;j]) + \"   \");\n            }\n            System.out.println(\");\n        }\n \n        \/\/ end rJava\n        re.end();\n    }\n}<\/code><\/pre>\n\n\n\n<p>In fact, it is interesting that the essential part of the above Java code is calling test_glmnet(). We can save many lines of code, which also depends on the extent or size of calculations or estimations.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>REXP x = re.eval(\"test_glmnet(\"+nvar+\")\");<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Point to Note<\/h3>\n\n\n\n<p>There is one important thing to know. When other (not built-in) libraries such as glmnet are included, the following rJava command is necessary. It is important.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>re.eval(\".libPaths('C:\/Users\/shlee\/Documents\/R\/win-library\/4.0')\");\n<\/code><\/pre>\n\n\n\n<p>Without the above rJava command, Eclipse returns an error message with &#8220;there is no package called &#8216;glmnet'&#8221;.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">First Run and Errors<\/h3>\n\n\n\n<p>When we run the above Java code, we encounter the following errors. Hence, we need to do some settings for CRjava2.java file.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" data-src=\"\/campus\/wp-content\/uploads\/sites\/2\/2023\/02\/02_Run_CRjava2_error-sh-fintech-modeling.png\" alt=\" class=\" class=\"wp-image-171019 lazyload\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" \/><\/figure>\n\n\n\n<p>But this first running this project is important because after this trial,&nbsp;<strong>Run Configuration<\/strong>&nbsp;(which will be explained later) can identify this project.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Setting for New Class Java File<\/h3>\n\n\n\n<p>Two settings on new added class file are necessary. After right mouse clicking on CRjava2.java (left file explorer : aRjava\/src\/aRjava\/CRjava2.java), select&nbsp;<strong>Run As<\/strong>&nbsp;\u2192&nbsp;<strong>Run Configurations<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" data-src=\"\/campus\/wp-content\/uploads\/sites\/2\/2023\/02\/03_CRjava2_Run_Config_Select-sh-fintech-modeling-2.png\" alt=\" class=\" class=\"wp-image-171032 lazyload\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" \/><\/figure>\n\n\n\n<p>In&nbsp;<strong>Arguments<\/strong>&nbsp;tab,&nbsp;<strong>VM arguments<\/strong>&nbsp;is filled as follows (Use copy and paste from aRjava setting).<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>VM arguments :&nbsp;-Djava.library.path=C:UsersshleeDocumentsRwin-library4.0rJavajrix64<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" data-src=\"\/campus\/wp-content\/uploads\/sites\/2\/2023\/02\/04_CRjava2_Run_Config_VMarguments-3-sh-fintech-modeling.png\" alt=\" class=\" class=\"wp-image-171035 lazyload\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" \/><\/figure>\n\n\n\n<p>In&nbsp;<strong>Environment<\/strong>&nbsp;tab, Add three directories in the following way (Use copy and paste from aRjava setting with buttons).<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>LD_LIBRARY_PATH :&nbsp;C:Program FilesRR-4.0.3bin;C:Program FilesRR-4.0.3library;C:UsersshleeDocumentsRwin-library;<\/li>\n\n\n\n<li>PATH :&nbsp;C:Program FilesRR-4.0.3binx64;C:UsersshleeDocumentsRwin-libraryrJavajrix64;<\/li>\n\n\n\n<li>R_HOME :&nbsp;C:Program FilesRR-4.0.3<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" data-src=\"\/campus\/wp-content\/uploads\/sites\/2\/2023\/02\/05_CRjava2_Run_Config_Environment-sh-fintech-modeling.png\" alt=\" class=\" class=\"wp-image-171022 lazyload\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" \/><\/figure>\n\n\n\n<p>Now the setting for the added class file is done completely.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Running and Results<\/h3>\n\n\n\n<p>When we rerun CRjava2.java file, We can obtain correct results.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" data-src=\"\/campus\/wp-content\/uploads\/sites\/2\/2023\/02\/Run_CRjava2_ok-sh-fintech-modeling.png\" alt=\" class=\" class=\"wp-image-171023 lazyload\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" \/><\/figure>\n\n\n\n<p>We can find that results from only R and Eclipse with rJava are same.<\/p>\n\n\n\n<p>Having done the overall environment setting already, we have only to add two settings on new added class file simply.<\/p>\n\n\n\n<p>From this post, we can make Java code with rJava compact from calling user-defined R functions efficiently. This will help reduce many lines to essentially one line and enhance code readability.<\/p>\n\n\n\n<p><em>Visit the <a href=\"https:\/\/kiandlee.blogspot.com\/2021\/06\/rjava-with-user-defined-r-functions-in.html\">SH Fintech Modeling Blog<\/a> to learn more about this topic. <\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This post shows how to call user-defined functions in R script from Eclipse Java with rJava package.<\/p>\n","protected":false},"author":662,"featured_media":183383,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[339,347,343,338,350,341,344,342],"tags":[7376,13039,596,487,12855],"contributors-categories":[13728],"class_list":{"0":"post-183377","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-data-science","8":"category-java-development","9":"category-programing-languages","10":"category-ibkr-quant-news","11":"category-quant-asia-pacific","12":"category-quant-development","13":"category-quant-regions","14":"category-r-development","15":"tag-eclipse","16":"tag-glmnet-r-package","17":"tag-java","18":"tag-r","19":"tag-rjava","20":"contributors-categories-sh-fintech-modeling"},"pp_statuses_selecting_workflow":false,"pp_workflow_action":"current","pp_status_selection":"publish","acf":[],"yoast_head":"<!-- This site is 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