我想把一些R代码内联到我写的一篇文章中.以下是好的:
The quick brown fox jumped over \`r 2+2\` lazy dogs
快速的棕色狐狸跳过4只懒狗
但是当我尝试将dplyr与以下数据帧组合时:
structure(list(name = structure(c(2L, 1L, 3L), .Label = c("Cat",
"Dog", "Horse"), class = "factor"), n = c(4L, 3L, 8L)), .Names = c("name",
"n"), class = "data.frame", row.names = c(NA, -3L))
它破了:
The quick brown fox jumped over \`r as.numeric(temp %>% filter(name=="dog") %>% select(n)\` lazy dogs
Quitting from lines 80-81 (QuickBrown.Rmd)
Error in base::parse(text = code, keep.source = FALSE) :
<text>:2:0: unexpected end of input
1: as.numeric(temp %>% filter(name=="Dog") …我有一个数据框，列出了参加活动 (Sub) 的学生总数 (Stu) 和每组学生人数 (ID)：
ID Stu Sub
(int) (int) (int)
1 101 80 NA
2 102 130 NA
3 103 10 NA
4 104 210 20
5 105 180 NA
6 106 150 NA
我想知道参与活动（Sub > 0）或不参与（Sub is.na）的大小范围（> 400，> 200，> 100，> 0）的团体数量
output <- structure(list(ID = c(101L, 102L, 103L, 104L, 105L, 106L),
Stu = c(80L, 130L, 10L, 210L, 180L, 150L),
Sub = c(NA,NA, NA, 20L, NA, NA)),
.Names = c("ID", "Stu", "Sub"),
class = c("tbl_df", "data.frame"),
row.names = …library(ggplot2)
library(dplyr)
diamonds <- diamonds %>% select(-clarity)
# this works fine
# but doing it again gives me an error
diamonds %>% select(-clarity)
Error in is_character(x) : object 'clarity' not found
如何安全删除/取消选择？
我在Windows上运行Lazarus.我真的想让节目"嘟嘟".看来你可以在Pascal中使用:
windows.beep(300,500);
但不是在拉撒路!我可以使用另一个命令吗？
更新:
sysutils.beep()
这有效,但我真的想设置声音的频率和持续时间
我无法在R中简化shapefile
Shapefile来自:https://geoportal.statistics.gov.uk/Docs/Boundaries/Local_authority_district_(GB)_2014_Boundaries_ (Generalised_Clipped).zip
library(tmap)
library(maptools)
library(ggmap)
England <- readOGR(dsn = "...")
#works fine
print(qtm(England, "LAD14CD", borders = NA, fill.title = "A-Level" ))
# simplify the polygons
England<-gSimplify(England,tol=0.01, topologyPreserve=TRUE)
print(qtm(England, "LAD14CD", borders = NA, fill.title = "A-Level" ))
给出错误:
Error in process_fill(data, g$tm_fill, gborders, gt, gf, z = z + which(plot.order == :
Fill argument neither colors nor valid variable name(s)
如果查看英国数据对象,您可以看到它已从大空间polygonDataFrame更改为大空间多边形并删除了@data
相反,如果您尝试仅简化Shapefile中的多边形:
England@polygons<-gSimplify(England@polygons,tol=0.01, topologyPreserve=TRUE)
它说:
Error in gSimplify(England@polygons, tol = 0.01, topologyPreserve = TRUE) :
cannot get a …我正在努力计算参加课程的学生数量,从那些能够参加课程的学生,并非所有学校都提供计算机,不同的学校提供英语,那些能够学习计算和英语的学生会有所不同.例如,使用下面的测试数据,我们有:
df <- read.csv(text="school, student, course, result
URN1,stu1,comp,A
URN1,stu2,comp,B
URN1,stu3,comp,C
URN1,stu1,Eng,D
URN1,stu1,ICT,E
URN2,stu4,comp,A
URN1,stu1,ICT,B
URN2,stu5,comp,C
URN3,stu6,comp,D
URN3,stu6,ICT,E
URN4,stu7,Eng,E
URN4,stu8,ICT,E
URN4,stu8,Eng,E
URN5,stu9,comp,E
URN5,stu10,ICT,E")
[1]"由58.3333333333333%可能的学生参加"
[1]"33.3333333333333%可能的学生参加了"
[1]"信息通信技术由38.4615384615385%的可能学生参加"
我有以下循环(嘘!)来做到这一点:
library(magrittr)
library(dplyr)
for(c in unique(df$course)){
# c <- "comp"
#get URNs of schools offering each course
URNs <- df %>% filter(course == c) %>% distinct(school) %$% school
#get number of students in each school offering course c
num_possible <- df %>% filter(school %in% URNs) %>% summarise(n = n()) %$% n
#get number of students …我想在一组列表中找到最小值
map min [[1, 3], [2, 7],[9, 6]]
我想要这个输出
[[1],[2],[6]]
它给出了错误：
* No instance for (Show ([Integer] -> [Integer]))
arising from a use of `print'
(maybe you haven't applied a function to enough arguments?)
* In a stmt of an interactive GHCi command: print it
我在Haskell GHCi中写一个简单的声明
myPi = 3.14
我也可以这样写
let myPi = 3.14
这两个声明之间的这个非常简单的示例有什么区别？我知道let的额外功能，但这里不需要
我试图在水晶报告中保持一定数量的教师,支持人员和管理人员,我决定使用全局变量来做这件事,我知道在其他方面它是可能的,但我想给全局变量一个去.
WhileReadingRecords;
Global NumberVar TotalSManagement;
Global NumberVar TotalSTeachers;
Global NumberVar TotalSSupport;
Global NumberVar TotalLManagement;
Global NumberVar TotalLTeachers;
Global NumberVar TotalLSupport;
if{staff_addresses_txt.Staff category} = "MANA" and {staff_addresses_txt.Name} = "CTK:Lewisham" then
TotalLManagement = TotalLManagement + 1
else
if{staff_addresses_txt.Staff category} = "TEAC" and {staff_addresses_txt.Name} = "CTK:Lewisham" then
TotalLTeachers = TotalLTeachers + 1
else
if{staff_addresses_txt.Staff category} = "SUPP" and {staff_addresses_txt.Name} = "CTK:Lewisham" then
TotalLSupport = TotalLSupport + 1
else
if{staff_addresses_txt.Staff category} = "MANA" and {staff_addresses_txt.Name} = "CTK:St Mary's" then
TotalSManagement = TotalSManagement + 1 …我可以在GHCi中执行以下操作，我知道在Haskell中不可能做到这一点：
Prelude> myPi = 3.14
Prelude> myPi = 4
Prelude> myPi
4
但是如果我把它放在文件中，就会给我一个错误
-- main.hs
myPi = 3.14
myPi = 4
Prelude> :l main.hs
main.hs:2:1: error:
Multiple declarations of ‘myPi’
Declared at: main.hs:1:1
main.hs:2:1
GHCi在做什么，以允许我“重新声明”变量。有办法阻止这种情况发生吗？
我想将python中的数字转换为3个字符的字符串,前缀为0.例如:
8 = "008"
12 = "012"
6 = "006"
谢谢