R Extract Column From Data Frame As Vector

For that reason the previous r syntax would extract the columns x1 and x3 from our data set. The first column of our example data is called x1 and the column at the third position is called x3. If matrix indexing is used for extraction a vector results.

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However this time we are using a numeric vector whereby each element of the vector stands for the position of the column.

R extract column from data frame as vector. Generally we extract columns as a vector from an r data frame but sometimes we might need a column as a data frame therefore we can use as data frame to extract columns that we want to extract as a data frame with single square brackets. Symbol is the most useful thing in r if the data frame name is dataset and you columns are like name age salary and if you want to pull a particular column from the data frame you need to create a vector for it to redirect the column to the vector. However there are several other alternatives example 2. Command to extract a column as a data frame the following represents a command which can be used to extract a column as a data frame.

If you use a command such as df 1 the output will be a. The purpose behind this could be merging the column with another data frame. If the result would be a data frame an error results if undefined columns are selected as there is no general concept of a missing column in a data frame. This is probably the easiest solution in case you want to convert a data frame column to a vector in r.

Convert data frame column to vector by subsetting data. As you can see based on the output of the rstudio console we stored the values of the column x1 in the vector object vec. For a data frame list or a single column the latter two only when dimensions have been dropped.