Riemann surface
matlab

R语言编程基础：包括R语言的基本语法、变量类型和数据结构等。

R语言包和函数：掌握常见的R语言包和函数，如dplyr、ggplot2、caret和shiny等。

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R语言在各领域的应用：探讨R语言在各种领域的应用，如生物信息学、金融分析、社会科学和数据科学等。

Exercise 8
Use head () to check the names of the columns, and the first few rows of data, in the data frame rainforest ( $D A A G$ ). Use table(rainforest\$species) to check the names and numbers of each species that are present in the data. The following extracts the rows for the species Acmena smithii$>1$ibrary (DAAG)$>$Acmena <- subset(rainforest, species=” “Acmena smithii”) The following extracts the rows for the species Acacia mabellae and Acmena smithii AcSpecies <- subset(rainforest, species \%in\% c(“Acacia mabellae”, “Acmena smithii”)) Now extract the rows for all species except C. fraseri. (a)$1: 20$(b)$20: 1$(c)$c(1: 20,19: 1)$(d)$\operatorname{tmp}<-c(4,6,3)$It is good style to use <- for assignment and to leave a space on both sides of the assignment operator <-. (e)$\operatorname{rep}(\operatorname{tmp}, 10)$(f)$\operatorname{rep}$(tmp,$1=31$) (g)$\operatorname{rep}(\mathrm{tmp}$, times$=\mathrm{c}(10,20,30))\$

Exercise 9
Extract the following subsets from the data frame ais (DAAG):
(a) Extract the data for the rowers.
(b) Extract the data for the rowers, the netballers and the tennis players.
(c) Extract the data for the female basketabllers and rowers.

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