Math Problem Statement
请帮我解释这段r语言代码: period <- paste(199:209,0,"-",substr(199:209,3,3),9,sep="") seqperiod <- factor(rep(period, each=15410)) an <- (1-exp(-hstmeanproj[, GG]%%coefsim[s,]))*deathproj tapply(an, seqperiod, sum)
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Math Problem Analysis
Mathematical Concepts
R programming
Factor variables
Matrix operations
Exponential function
Formulas
-
Theorems
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Suitable Grade Level
Professional