Publications by tomizono
Stage abundances, eigenvector of population matrix
The previous article introduced the seasonal matrices and the population growth rate λ of imaginary annual plant. This article focuses on the meaning of the eigenvector at first, and then focuses on the reduction of seasons from 4 to 2. 4. Population structure The eigenvector corresponding to the dominant eigenvalue λ gives the stable popu...
2062 sym R (553 sym/3 pcs) 10 img 1 tbl
Sensitivity and Elasticity of seasonal matrix model
The previous article introduced the seasonal matrices and the population growth rate λ of imaginary annual plant. In this article, let’s try the sensitivity analysis of these matrices and the λ. In sensitivity and elasticity formula, some symbols such as s, v and w are assigned to different meanings from previous. 6. Sensitivity Sensitiv...
3089 sym R (2258 sym/5 pcs) 18 img
Calculates population growth rate λ along element changes
The previous article introduced the sensitivity and elasticity to seasonal matrix model of imaginary annual plant. Both sensitivity and elasticity are partial derivatives. This means the values can only predict a change of λ with respect to a small change of a element. To know how λ will affected by a large shift or changes of multiple elem...
1504 sym R (3508 sym/14 pcs) 20 img
First step on GIS with R
The PM 2.5 checker written by R has been working nicely for me. I put a shortcut icon of this small script on my desktop PC, to check the air pollution when I run. The Ibaraki Prefecture Agency has been increasing watching points for PM 2.5 concentration from China. A problem is that I cannot picture to myself all the observation locations ...
4487 sym R (4561 sym/18 pcs) 26 img
Pitfall of XML package: issues specific to cp932 locale, Japanese Shift-JIS, on Windows
CRAN package XML has something wrong at parsing html pages encoded in cp932 (shift-jis). In this report, I will show these issues and also their solutions which is workable at user side. I found the issues are common at least on both Windows 7 and 10 with Japanese language. Though other versions and languages are not checked, the issues may c...
3264 sym R (1526 sym/8 pcs) 4 img
Pitfall of XML package: to know the cause
This is the sequel to the previous report “issues specific to cp932 locale, Japanese Shift-JIS, on Windows“. In this report, I will dig the issues deeper to find out what is exactly happening. 1. Where it occurs I knew the issues depend node texts, because a very same script run on Windows to parse another table in the same html source. # W...
5186 sym R (7112 sym/17 pcs) 4 img
Tips for Ellipse Summary Plot
I privately had some questions and reply here, because it may also help others including me. 1. How to specify size With plot axis parameters. > ellipseplot(iris[,c(‘Species’, ‘Sepal.Length’)], iris[,c(‘Species’, ‘Sepal.Width’)], xlim=c(4,8), ylim=c(2,5)) 2. How to specify color With plot color parameter. > ellipseplot(iris[,c(�...
2131 sym 2 img