Edward Tufte has written extensively on the presentation of data covering good and bad practice. He has made a number of suggestions for adaptations of regularly used graph types to assist with the interpretation and understanding of data. One idea for enhancing scatter plots covered in Tufte’s book Beautiful Evidence is the use of...
Posts Tagged ‘ image() ’
R is a cool image editor #2: Dithering algorithms
Here I implemented in R some dithering algorithms: - Floyd-Steinberg dithering - Bill Atkinson dithering - Jarvis-Judice-Ninke dithering - Sierra 2-4a dithering - Stucki dithering - Burkes dithering - Sierra2 dithering - Sierra3 dithering For each alg...
R is a cool image editor!
Here I present some functions I wrote to recreate some of the most common image effect available in all image editor.They require the library rimage.To load the image, use:y <- read.jpeg("path")To display the image, use:plot(y&...
Displaying data using level plots
A level plot is a type of graph that is used to display a surface in two rather than three dimensions – the surface is viewed from above as if we were looking straight down and is an alternative to a contour plot – geographic data is an example of where this type of...
Simulation of Burning Fire in R
inlin Yan posted a cool (hot?) simulation of burning fire with R in the COS forum yesterday, which was indeed a warm welcome. I’m not sure whether our forum members will be scared by the “fire” under the title “Welcome to COS Forum”. The fire was mainly created by the function image()...
Preparing plots for publication
The plotting capabilities of R are excellent; however, when I am preparing a figure for publication, I often need to combine multiple plots or add objects (e.g., arrows or text) to an existing plot. While this can be accomplished in R, my patience for ...
Convert image to matrix in R
This is how to use the Pixmap library to read in an image as a matrix.> library(pixmap)# the next command may only work on Linux> system("convert foo.tiff foo.ppm")> img str(img)Although included in the previous output, the size of the image can be ex...
Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).
