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。

R Markdown和报告生成：使用R Markdown编写报告，以及利用knitr和rmarkdown包生成HTML、PDF和Word报告。

R Shiny和交互式应用：学习使用R Shiny开发交互式Web应用，包括基础的Shiny应用开发和高级的Shiny应用开发。

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。

Create the vectors:
(a) $(1,2,3, \ldots, 19,20)$
(b) $(20,19, \ldots, 2,1)$
(c) $(1,2,3, \ldots, 19,20,19,18, \ldots, 2,1)$
(d) $(4,6,3)$ and assign it to the name tmp.
For parts (e), (f) and (g) look at the help for the function rep.
(e) $(4,6,3,4,6,3, \ldots, 4,6,3)$ where there are 10 occurrences of 4 .
(f) $(4,6,3,4,6,3, \ldots, 4,6,3,4)$ where there are 11 occurrences of 4,10 occurrences of 6 and 10 occurrences of 3 .
(g) $(4,4, \ldots, 4,6,6, \ldots, 6,3,3, \ldots, 3)$ where there are 10 occurrences of 4,20 occurrences of 6 and 30 occurrences of 3 .

(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 $=\mathrm{c}(10,20,30))$

Use the function paste to create the following character vectors of length 30 :
(a) (“label 1”, “label 2”, …., “label 30”).
Note that there is a single space between label and the number following.
(b) (“fn1”, “fn2”, …, “fn30”).
In this case, there is no space between $\mathrm{fn}$ and the number following.

(a) paste(“label”, 1:30)
(b) paste (“fn”, 1:30, sep=”n’)

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