colnames(airquality) # columns names nrow(airquality) # number of rows ncol(airquality) # number of columns # cbind rbind 为数据框添加行和列 cbind(myDf1, myDf2) # columns append DFs with same no. rows rbind(myDf1, myDf1) # row append DFs with same no. columns 1. 2. 3. 4. 5....
In the above example, we have created a data frame nameddataframe1with three columnsName,Age,Vote. Here, we have used different operators to accessNamecolumn ofdataframe1. Accessing with[[ ]]or$is similar. However, it differs for[ ],[ ]will return us a data frame but the other two wil...
# Create a time seriesplot(ggplot(data=medal_noc_year)+geom_area(aes(x='Year',y='Gold',group=1),size=1,fill='#FFD700',alpha=0.7)+geom_area(aes(x='Year',y='Silver',group=1),size=1,fill='#C0C0C0',alpha=0.8)+geom_area(aes(x='Year',y='Bronze',group=1),size=1,fill='#...
This little script will create a new field called weightclass and spin through the multiple columns of our data frame, using a simple if-then conditional test to assess which rows represent “large” birds and which rows are “small” birds. Got more than two outcomes? Here’s a way to ...
a row index or column index from an original dataframe object, and sort rows into in a selected sort order to create a better organized dataset. The order sort function is a great example of a key function for our analysis, and you can use the default sort order or use a different ...
我在R中有一个数据帧,其中有5 columns.The。第一列是ID被拆分的两组。接下来的四列是questionnaire.的答案,其中2列是连续变量,另外两列是分类变量。 library(dplyr) # set random seed for reproducibility set.seed(123) # create first column with categorical variable with levels yes and no ...
4)Example 3: while-Loop Through Columns of Data Frame 5)Example 4: repeat-Loop Through Columns of Data Frame 6)Video & Further Resources Let’s dive right in… Example Data As a first step, I’ll have to create some data that we can use in the examples later on: ...
The first argument you pass to subset() is the name of your dataframe, cash. Notice that you shouldn't put company in quotes! The == is the equality operator. It tests to find where two things are equal and returns a logical vector. Interactive Example of the subset() Method In the ...
Create a data frame with more than 50 columns and attempt to navigate with the "Cols" arrows after viewing the data frame. Describe the problem in detail I am currently working on a project and analyzing a dataset that has more than 50 columns of data, and after updating to the latest ...
multiplication in tryCatch## If there is an exception, print the warning message to## standard error and return NAtryCatch(log(multiplier * invec), error =function(e){warning(warningmessages[4]);NA}) }## Apply the transformation function to the 4 columns## of the dataframe with ...