Category Archives: programming

Matplotlib Quick Starter

Posted on April 20, 2017 by Bruce Zhou

Introduction Matplotlib is an open source plotting library for Python (NumPy), designed closely to MATLAB. Last update to this tutorial is on: 2017-04-20. Installation Python 3.X (with many useful libs such NumPy, Matplotlib) & Jupyter notebook (GUI Python Code Editor, … Continue reading →

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RcppArmadillo Test Notes – A Step-by-Step Tutorial to Create Your Own R Package Based on RcppArmadillo

Posted on August 25, 2015 by Bruce Zhou

Test environment: R version 3.2.2 Rtools 33 Windows 7 64-bit Install the packages “Rcpp”, “RcppArmadillo” and “inline” for R. Download and install Rtools at https://cran.r-project.org/bin/windows/Rtools/, which is needed for building packages for R under Microsoft Windows. When installing, check the … Continue reading →

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.m Function to .oct File – Syntax Translation Table

Posted on June 29, 2014 by Bruce Zhou

One of the things Octave is superior to Matlab is Octave’s C++ code interface – Oct-Files. With Oct-Files, you can use a similar syntax in C++ as in the m language, which is much more convenient than the Matlab’s .mex … Continue reading →

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Blender for Data Visualization – Updated Code for Blender 2.6

Posted on June 30, 2013 by Bruce Zhou

Finally I updated the data visualization code from Blender 2.49 to Blender 2.6. You can find the updated Python source code here: https://bzstat.googlecode.com/svn/trunk/DataVisualization/Blender/Update_2.6 The Blender Python APIs changed a lot since Blender 2.5, but the biggest problem is lack of … Continue reading →

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Blender for Data Visualization Part 2 – Render Output as Vector Graphics

Posted on February 25, 2012 by Bruce Zhou

In my last post, I showed you the basics to use Blender and Python for data visualization. Python is a powerful language which is very suitable for (large) data set processing, we may further explore it later. Blender is one … Continue reading →

Posted in data visualization, programming, Python | 5 Comments

Blender for Data Visualization

Posted on December 5, 2011 by Bruce Zhou

There are many tools and languages for visualizing data, such as R (1 , 2, 3), Processing, Flash (1, 2, 3). And the powerful open source 3D editor Blender is of course one of them. The advantage of using Blender … Continue reading →

Posted in data visualization, programming, Python | 4 Comments

Using SDL and OpenGL in R

Posted on October 13, 2011 by Bruce Zhou

SDL(Simple DirectMedia Layer) is “A cross-platform multimedia library designed to provide fast access to the graphics framebuffer and audio device”. OpenGL is “The Industry Standard for High Performance Graphics”. With rdyncall package, which provides “a cross-platform framework for dynamic binding of … Continue reading →

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Using Lib FANN in R via Rcpp

Posted on July 10, 2011 by Bruce Zhou

Test Environment: OS: Windows XP, R: R 2.12.2(G:\Program Files\R\R-2.12.2\), Rcpp: 0.9.4, Rtools: 212 (G:\Rtools), FANN: 2.1.0 Lib FANN(Fast Artificial Neural Network Library) is a free open source neural network library written in C. In this tutorial I will show you … Continue reading →

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The Rcpp package test notes

Posted on July 7, 2011 by Bruce Zhou

Test Environment: OS: Windows XP, R: R 2.12.2(G:\Program Files\R\R-2.12.2\), Rcpp: 0.9.4 1. Download and install the Rtools(for windows): http://www.murdoch-sutherland.com/Rtools/ I installed the Rtools into “G:\Rtools“. 2. Set Enviroment Path for windows: Desktop -> right-click My Computer -> click Properties -> … Continue reading →

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R Tricks – Macros and Conditional Execution in R

Posted on July 4, 2011 by Bruce Zhou

1 Use Macros in R Problem You want to use C-like macros, such as “#define” in R. Solution Use “defmacro” in {gtools} pacakge. http://cran.r-project.org/web/packages/gtools/index.html https://stat.ethz.ch/pipermail/r-help/2007-April/130015.html 2 Conditional Execution Problem You want to use C-like macros, such as “#include” and C-like … Continue reading →

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