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Group calculation of R
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| mountain | aspect | species | cover | r | |
|---|---|---|---|---|---|
| SEN | W11 | A | 30 | 1 | |
| SEN | W11 | B | 10 | 3 | |
| SEN | W11 | C | 0.5 | 2 | |
| SEN | W13 | A | 15 | 4 | |
| SEN | W13 | D | 5 | 3 | |
| SEN | W13 | E | 3 | 2 | |
| SEN | W13 | F | 0.1 | 1 | |
| SEN | W13 | G | 10 | 4 | |
| SUN | E11 | A | 15 | 2 | |
| SUN | E11 | B | 5 | 3 | |
| SUN | E11 | C | 0.5 | 2 | |
| SUN | E11 | E | 1 | 4 | |
| SUN | S13 | D | 35 | 1 | |
| SUN | S13 | E | 10 | 1 | |
| SUN | S13 | F | 5 | 2 | |
| SUN | S13 | G | 1 | 4 |
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| library(data.table) | |
| exampleFile <- 'https://gist.githubusercontent.com/mutolisp/4898bb2e25a33487385bf5ede8e553da/raw/f101cc6e126eb2475d2345377bd02bbee3474799/dummy.csv' | |
| dummy <- fread(exampleFile, sep = ',', header = T) | |
| # calculate cover summation by mountain and aspect | |
| dummy[, sum(cover), by = .(mountain, aspect)] | |
| # calculate thermophilization indicator | |
| Tsi <- dummy[, sum(cover*r)/sum(cover), by = .(mountain,aspect) ] |
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