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Many a times we use static methods or constants in our class. For example if you are writing a math library, there are chances that you would need to use lot of math functions from java.lang.Math. for example to calculate the nth power of x you would do y = Math.pow(x,3); pow is a static … Read more
It is useful to redirect standard java output to a file. However, if you are wondering why your stacktrace from e.printStackTrace() is not being redirected to a file then read on… Say you have a program called RedirectExample.java. To redirect the output to a text file do java RedirectExample > output.txt However, if your code in … Read more
WordPress permalink URLs may contain index.php. The standard way to remove them on an apache server is to use a .htaccess file. However, if you are one of those few people who have wordpress on apache tomcat (application server) and see no advantage in installing a separate web server, there is a way in which … Read more
Building CDO with Netcdf, HDF5 and GRIB2 support. Download CDO from https://code.zmaw.de/projects/cdo/files. On a unix box download using wget- “wget https://code.zmaw.de/attachments/download/11392/cdo-1.7.0.tar.gz.” Use the latest verion of cdo. Download NetCDF from http://www.unidata.ucar.edu/downloads/netcdf/index.jsp. Use the C version. On Unix – “wget ftp://ftp.unidata.ucar.edu/pub/netcdf/netcdf-4.3.3.1.tar.gz”. Download Grib API from https://software.ecmwf.int/wiki/display/GRIB/Releases. On unix – “wget https://software.ecmwf.int/wiki/download/attachments/3473437/grib_api-1.14.4-Source.tar.gz?api=v2” Download Jasper from http://www.ece.uvic.ca/~frodo/jasper/#download. On … Read more
yes, It is possible to call javascript from java, and the functionality is built right into the JVM!. Here’s a simple way to do it . Lets say you have a javascript called file.js, which has a method called sum(a,b). To call this method from java, do the following: The imports: import javax.script.Invocable; import javax.script.ScriptEngine; … Read more
NOTE : This tutorial has been superseded by the exhaustive tutorials Here Lists Collection of Objects of same or mixed type.List may also contain vector or other lists. Create a list using the funtion list(). The following example shows operations that can be performed on a list. > alphabets=list(a=”apple”,b=”ball”,c=”cat”) > alphabets $a [1] “apple” $b … Read more
NOTE : This tutorial has been superseded by the exhaustive R tutorials Here Basics Start R in Windows using the program menu. To quit : q(). to call help for a function. help([function]) or ?[function]. use double quotes to escape special characters and tokens. e.g. ?”for”. objects() or ls() to obtain list of objects stored. rm([object]) … Read more
R is a powerful open source Analytic platform. The power of R lies within the fact that an active scientific community develops and uses it. With the cost of software rising at a fast pace, businesses are realizing the need to move to open source technologies from costly proprietory software. R if therefore, now, finding … Read more
Setting up R-Java in Netbeans is pretty straight forward. For those who need a walkthough here are the steps. Download and install R (for this example version 2.12.2). install rJava package. Download and install Netbeans. In Netbeans Create a new java project. we will call it RJava. From the [R_HOME]>/library/rJava/jri/examples folder, copy the file rtest.java … Read more
Update – Check out the new RJava Eclipse Plugin.The steps to install rjava on a 64 bit machine is not very different from installing it on a 32 bit machine. however, here are the exact steps. 1. Install 64 bit java.2. Install R 2.12.X3. Start R and install the rjava package using the package installer.4. … Read more