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The ResistorArray package gives functionality for
calculating electrical properties of resistor networks. Any array of
resistors may be implemented and a number of special arrays are given as
data. For example, a skeleton cube has 8 nodes and a conductance matrix
for unit resistors along each edge is given by cube():
cube()## [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8]
## [1,] 3 -1 0 -1 -1 0 0 0
## [2,] -1 3 -1 0 0 -1 0 0
## [3,] 0 -1 3 -1 0 0 -1 0
## [4,] -1 0 -1 3 0 0 0 -1
## [5,] -1 0 0 0 3 -1 0 -1
## [6,] 0 -1 0 0 -1 3 -1 0
## [7,] 0 0 -1 0 0 -1 3 -1
## [8,] 0 0 0 -1 -1 0 -1 3A common puzzle is to calculate the resistance of such a cube between diagonally opposite corners, the answer being (the trick being to observe that nodes equidistant from the corners are at the same potential). This is easily reproduced in the package:
resistance(cube(),1,7)## [1] 0.8333333However, the trick does not work for general resistances but the package has no problem:
resistance(cube(1:12),1,7)## [1] 4.766791The package includes many other convenience functions; it is still under development.
To install the most recent stable version on CRAN, use
install.packages() at the R prompt:
R> install.packages("ResistorArray")To install the current development version use
devtools:
R> devtools::install_github("RobinHankin/ResistorArray")And then to load the package use library():
library("ResistorArray")R. K. S. Hankin 2006. “Resistor networks in R: introducing the
ResistorArray package”. R News, 6(2),52-54
These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.