您可以在記憶體中建立以現有 DataFrame 為基礎的具名暫存檢視。 例如,在筆記本資料格中執行下列程式碼,以用來SparkR::createOrReplaceTempView取得前面名為jsonTableDataFrame 的內容,並將暫存檢視從中命名為timestampTable。 然後,使用sparklyr::spark_read_table來讀取暫存檢視的內容。 使用sparklyr::collect預設列印臨時表...
Creates a data frame named exam_data with four columns: name, score, attempts, and qualify. Each column contains a vector of values corresponding to students' names, their scores, the number of attempts, and whether they qualified, respectively. Prints the message "Original dataframe:" to ...
azureml_main <- function(dataframe1, dataframe2){ print("R script run.") dataframe1 <- data.frame(installed.packages()) return(list(dataset1=dataframe1, dataset2=dataframe2)) } 备注 如果你的管道包含需要不在预安装列表中的包的多个“执行 R 脚本”组件,请在每个组件中安装这些包。安装...
而是带下画线的小写字母数字。好的列名称还应该是描述性的，言简意赅，并且不应与现有的DataFrame或...
fread gains check.names argument, with default value FALSE. When TRUE, it uses the base function make.unique() to ensure that the column names of the data.table read in are all unique. Thanks to David Arenburg for filing #1027. data.tables can join now without having to set keys by ...
Type SAT to replace myDataFrame, and then press TAB. Type sat.csv to replace myFile, and then press TAB. Type TRUE to replace FALSE; this tells R to use the first line of the csv file as column names for the new R data frame. Press TAB twice to highlight the placeholder field for...
read_all_excel_sheets(): Combines all Excel sheets in a given file into a single dataframe, adding an extra column called sheet for the sheet name. Takes all the same arguments as readxl's read_excel(). pizza_deliveries <- read_all_excel_sheets( pizza_deliveries.file, skip = 3, ) co...
capitalize the name of each word that is joined together, with no periods. Try to make function names verbs. Assignment Use <-, not = for assignment statements :R对象(R objects) 原始对象类型(Primitive Object Types) Basic vectors These are vectors containing a single type of value: integers,...
The generated dataframe is named semantic model, and you access selected columns by their respective names. For example, access the gear field by adding dataset$gear to your R script. For fields with spaces or special characters, use single quotes. With the dataframe automatically generated by th...
Note thatprop_datais a smallDataFrame that has been collected into memory in our R session, we can take advantage ofggplot2to create an informative visualization (seeFigure 4-2): prop_data%>%ggplot(aes(x=religion,y=prop))+geom_point(size=2)+geom_errorbar(aes(ymin=prop-1.96*se,ymax=...