#Lamb lovers hands up 🙌🏻🙌🏻
The "Halal True Aussie Beef & Lamb Virtual Luncheon & Webinar" by Meat & Livestock Australia (MLA), including cooking demo by Chef Jason Manson to learn #cooking tips a simple Beef Rendang recipe in a R&D format using the Australian beef blade cut. Read more by @SiennyYong aka @Siennylovesdrawing 👩🏻 via 🌐 https://siennylovesdrawing.medium.com/the-halal-integrity-of-australian-beef-and-lamb-from-farm-to-table-58286d6dd4d
Ohh ya...#sharing some of her quick easy #healthy #redmeat #recipes 👩🏻🍳
Yum yum yum 😋🤤 @TikTok #TikTok clip via
📹🌐 https://vt.tiktok.com/ZSeeqbsp3/ ~ croissant
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A detailed #lambshabushabu #recipe #blogpost soon via 🌐 https://siennylovesdrawing.wordpress.com/
Read more of her earlier lamb #tasty #sharing via 🌐 https://siennylovesdrawing.wordpress.com/2021/06/25/healthy-red-meat-recipe-air-fried-lamb-rack/ & 🌐 https://siennylovesdrawing.wordpress.com/2021/06/29/healthy-red-meat-recipe-sesame-sweet-salty-true-aussie-lamb-shabu-shabu-salad/
@trueaussiemalaysia True Aussie Beef & Lamb Mexico Meat & Livestock Australia @TrueAussieBeefandLambSingapore #TrueAussieMy #lambassador #australianbeefandlamb #TrueAussieLamb #PremiumMeat #TheGreatAussieBeefEscape #TrueAussie #BeAussome #food #foodie #foodies #Australia #BeefUp #BeefUpMy #beef #lamb #trueaussiebeef
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「table r」的推薦目錄:
- 關於table r 在 Siennylovesdrawing Facebook 的最佳解答
- 關於table r 在 Siennylovesdrawing Facebook 的精選貼文
- 關於table r 在 Facebook 的最佳解答
- 關於table r 在 Frugal Outdoors & Camping Youtube 的精選貼文
- 關於table r 在 KIM THAI Youtube 的最佳解答
- 關於table r 在 KIM THAI Youtube 的精選貼文
- 關於table r 在 [心得] 資料整理套件介紹-第一章data.table - 看板R_Language 的評價
- 關於table r 在 2 R 資料結構| 資料科學與R語言 的評價
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- 關於table r 在 Read a table from an ESRI file geodatabase (.gdb) using R 的評價
table r 在 Siennylovesdrawing Facebook 的精選貼文
#Lamb lovers hands up 🙌🏻🙌🏻 Read more Sienny Yong aka Siennylovesdrawing 👩🏻 via 🌐 https://siennylovesdrawing.medium.com/the-halal-integrity-of-australian-beef-and-lamb-from-farm-to-table-58286d6dd4d
The "Halal True Aussie Beef & Lamb Virtual Luncheon & Webinar" by Meat & Livestock Australia (MLA), including cooking demo by Chef Jason Manson to learn #cooking tips a simple Beef Rendang recipe in a R&D format using the Australian beef blade cut. Including his findings on the cooking process and the dish outcome based on texture, flavour, aroma, juiciness, tenderness, form, dish presentation and cooking duration
Her #redmeat lunch ~ Australian Halal Masala Lamb Curry (lamb shoulder), rice and raita; + Grilled Lamb Rack and baquette
Ohh ya...Let’s Explore the Taste of True Aussie Lamb with @SiennyYong aka @Siennylovesdrawing 👩🏻😋🤤, #sharing some of her #healthy #redmeat #recipes 👩🏻🍳
😋 #AirFried #LambRack, &
😋 Sesame Sweet Salty Lamb Shabu Shabu Slices #Salad 🥗
Yum yum yum 😋🤤 TikTok #TikTok clip via 📹🌐 https://vt.tiktok.com/ZGJh4YJwE/ & 📹🌐 https://vt.tiktok.com/ZGJhCWVUj/
Read more of her #tasty #sharing via 🌐 https://siennylovesdrawing.wordpress.com/2021/06/25/healthy-red-meat-recipe-air-fried-lamb-rack/ & 🌐 https://siennylovesdrawing.wordpress.com/2021/06/29/healthy-red-meat-recipe-sesame-sweet-salty-true-aussie-lamb-shabu-shabu-salad/
True Aussie Beef & Lamb Malaysia True Aussie Beef & Lamb Mexico Meat & Livestock Australia True Aussie Beef & Lamb Singapore #TrueAussieMy #lambassador #australianbeefandlamb #TrueAussieLamb #PremiumMeat #TheGreatAussieBeefEscape #TrueAussie #BeAussome #food #foodie #foodies #Australia #BeefUp #BeefUpMy #beef #lamb #trueaussiebeef
table r 在 Facebook 的最佳解答
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table r 在 Frugal Outdoors & Camping Youtube 的精選貼文
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table r 在 KIM THAI Youtube 的最佳解答
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table r 在 2 R 資料結構| 資料科學與R語言 的推薦與評價
data.table是data.frame資料框型別的延伸,如要使用必須安裝data.table (Dowle and Srinivasan 2019) package,使用 data.table 讀取大型資料的速度比使用資料框快上數倍, ... ... <看更多>
table r 在 [心得] 資料整理套件介紹-第一章data.table - 看板R_Language 的推薦與評價
data.table包含的東西很多
但是很多東西都可以被plyr, dplyr的function取代
所以data.table很多function,我都不太熟
這裡簡單介紹一下data.table
如果你想要了解更多,請自行去看manual
要了解data.table,我們可以先從package的description來看
"Fast aggregation of large data (e.g. 100GB in RAM), fast ordered joins,
fast add/modify/delete of columns by group using no copies at all, list
columns and a fast file reader (fread). Offers a natural and flexible syntax,
for faster development."
簡單翻譯一下,大資料(例如,記憶體中大小為100GB的資料)的在不創建複本下,根據
類別(group)變數進行快速整合、排列、合併、增加/修改/刪除行資料等動作。...
重點就在不創建複本,因為R修改data.frame時,會先複製一次再修改,
然後傳回複本,因此,會浪費不少記憶體,而且很容易拖累速度,因此,
data.table提供這方面更有效率的操作。
(這方面的速度比較可以參考#1LeXNCKV (R_Language) [分享] 資料數據處理修改)
1. data.table
這個函數基本上data.frame使用差不多,而且data.frame的參數都可以放進
像是很常用到的stringsAsFactors,只是data.table預設是FALSE,
這點跟data.frame不同,使用上需要注意,範例如下:
` R
t = data.table(a = LETTERS[1:3])
str(t)
# Classes ‘data.table’ and 'data.frame': 3 obs. of 1 variable:
# $ a: chr "A" "B" "C"
# - attr(*, ".internal.selfref")=<externalptr>
t2 = data.frame(a = LETTERS[1:3])
str(t2)
# 'data.frame': 3 obs. of 1 variable:
# $ a: Factor w/ 3 levels "A","B","C": 1 2 3
`
第二個差異是data.table不包含rownames,
在轉換data.frame到data.table時,要注意這點
下一章會提到把rowname轉成column的函數
附註一條:data.table都包含data.frame的class
可以用在data.frame的方法都可以在data.table上實現
但是data.table還多了一個引數 "key",我對它的解讀是一種索引的概念
而透過索引的動作都會被加速。
key可以是一個變數,也可以是多個變數,這點看個人使用。
再來,就是data.table的'[',這部分跟data.frame不太一樣
所以需要特別說明,但是這部分,我自己也不是很熟悉,我只能大概講過
a. 我們很常在data.frame做取多行的動作,在data.table是不可行的,舉例:
` R
vars = data.frame(X = rnorm(3), Y = rnorm(3), Z = rnorm(3))
vars[,1:2]
# X Y
# 1 -0.5677575 2.1831285
# 2 -0.7161529 0.3714633
# 3 1.2665120 0.7837508
vars_dt = data.table(vars)
vars_dt[,1:2]
# [1] 1 2
`
但是你想這麼做,怎麼辦? 加上with=FALSE就好了,或是用list包住column name
` R
vars_dt[,1:2,with=FALSE]
# X Y
# 1: -0.5677575 2.1831285
# 2: -0.7161529 0.3714633
# 3: 1.2665120 0.7837508
vars_dt[j=list(X, Y)]
# X Y
# 1: -0.5677575 2.1831285
# 2: -0.7161529 0.3714633
# 3: 1.2665120 0.7837508
`
剩下像是by, .SD, .SDcols等自行?data.table查看吧
data.table的部分就先說明到這,接下來,講一些相關的function
b. setkey: 改變key的值, setnames: 改變column name,但是一樣不製造複本
c. copy: 製造data.table的複本
d. setDF: 在不製作複本下,把data.table的class改為data.frame
舉例:
` R
DT = data.table(X = rnorm(3), Y = rnorm(3))
str(DT)
# Classes ‘data.table’ and 'data.frame': 3 obs. of 2 variables:
# $ X: num -1.3738 0.167 -0.0578
# $ Y: num 0.487 1.728 0.646
# - attr(*, ".internal.selfref")=<externalptr>
setDF(DT)
str(DT)
# 'data.frame': 3 obs. of 2 variables:
# $ X: num -1.3738 0.167 -0.0578
# $ Y: num 0.487 1.728 0.646
DT = data.table(X = rnorm(3), Y = rnorm(3))
tracemem(DT)
# [1] "<0000000006A1BE28>"
setDF(DT) # 沒有複製的動作
DF = data.frame(DT)
retracemem(DF, retracemem(DT))
# tracemem[<0000000006A1BE28> -> 0x00000000061ec928]:
## 記憶體位置就發生改變了,就複製了DT一次
`
這部分可能不太懂,不過沒關係,記住一點,要轉成data.frame用setDF就好
e. setDT: setDF的反向
f. duplicated, unique
duplicated提供一個跟data.table列數相等長度的邏輯值向量,
TRUE代表前面有一樣的列,FALSE代表沒有
unique則是留下沒有重複的列,舉例來說:
` R
set.seed(100)
DT = data.table(A = rbinom(5, 1, 0.5), B = rbinom(5, 1, 0.5))
# A B
# 1: 0 0
# 2: 0 1
# 3: 1 0
# 4: 0 1
# 5: 0 0
duplicated(DT)
# [1] FALSE FALSE FALSE TRUE TRUE
unique(DT)
# A B
# 1: 0 0
# 2: 0 1
# 3: 1 0
DT[!duplicated(DT)]
# A B
# 1: 0 0
# 2: 0 1
# 3: 1 0
`
不過unique還有更多功能,它可以選擇變數做unique,舉例來說:
` R
unique(DT, by = "A")
# A B
# 1: 0 0
# 2: 1 0
unique(DT, by = "B")
# A B
# 1: 0 0
# 2: 0 1
`
順便一提,dplyr的distinct,如果你input的class是data.table
它就是用unique做的
` R
library(dplyr)
distinct(DT)
# A B
# 1: 0 0
# 2: 0 1
# 3: 1 0
`
你如果想看distinct怎麼做,可以在R上面打dplyr:::distinct_.data.table
> dplyr:::distinct_.data.table
function (.data, ..., .dots)
{
dist <- distinct_vars(.data, ..., .dots = .dots)
if (length(dist$vars) == 0) {
unique(dist$data)
}
else {
unique(dist$data, by = dist$vars)
}
}
之後提到distinct,我們再來講distinct
其他相關function像是subset, setcolorder, setorder (setorderv)
對這三個function有興趣,再去看manual,不贅述
這三個對應到dplyr的filter, select, arrange,之後我們會再提到這些
g. transform: 改變column的屬性、值等,舉例來說:
` R
DT = data.table(a = 1:3, b = 2:4, c = LETTERS[1:3])
DT2 = copy(DT)
DT[, b := b**2]
DT2 %<>% transform(b = b**2)
all.equal(DT, DT2) # TRUE
DT %<>% transform(c = as.factor(c))
str(DT)
# Classes ‘data.table’ and 'data.frame': 3 obs. of 3 variables:
# $ a: int 1 2 3
# $ b: num 4 9 16
# $ c: Factor w/ 3 levels "A","B","C": 1 2 3
# - attr(*, ".internal.selfref")=<externalptr>
`
h. set: 用來變更特定column,某些列的值,舉個簡單的例子
` R
DT = data.table(a = 1:3, b = 2:4)
DT2 = copy(DT)
DT[, b := 1]
set(DT2,, "b", value = 1)
all.equal(DT, DT2) # TRUE
`
一般來說都用'['來做,但是你如果需要用到for再來完成,再用set
還有一個function是 J,這裡就不提了,一樣請洽manual
最後,還有一個operator,':=',它是用來擴增data.table的column,
同樣,也不創造複本,這樣可以更快的增加column
那如果刪除怎麼辦?還記得前面學過 DT[, list('X', 'Y')],就用這個
再來,我們講一些data.table中其他function
2. fread
功能可以用來取代read.table, read.csv
它可以用多種separate去分割columns,然後讀入R
而且讀入速度比read.table, read.csv快很多
但是注意,不規則的檔案會讀入失敗
這裡提幾個參數:
a. sep: column跟column之間的分隔,如果是csv就是',',
如果是tab separated values就是'\t'
b. na.strings: 視作NA的字串,它可以是一個vector
c. stringsAsFactors:是否要把字串轉成factor,預設是否
d. colClasses:各行的classes,可以自行設定
我愛用fread還有一個原因,第一個input可以直接放我要讀的字串,
但是read.table需要經過其他的方式,有點麻煩(我懶得記,其實沒記過)
舉例來說
` R
text = "a b
1 2
3 4"
DT = fread(text)
setDF(DT) # 轉成data.frame,前面學過,還記得嗎?
DF = read.table(header = TRUE, text = text) # text format
DF2 = read.table(textConnection(text), header = TRUE) # file format
all.equal(DT, DF) # TRUE
all.equal(DT, DF2) # TRUE
`
fread很適合拿來讀大資料,所以有必要把table輸出成text
用文字方式處理時,讀入就變得很方便,可見 #1LegOjwB (R_Language)
還剩下 dcast.data.table, melt 跟 merge
它們會留到之後跟tidyr一起介紹
下一章重點會放在dplyr
補充:
key,我也不是很熟悉,也很少用,因此,我這裡介紹的很少
如果對key有興趣,可能需要自行研究
[關鍵字]: data.table, reshape2
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