R Dataframe Column Names From Vector

I tried various things with grep and matrix operations but they did not work.

R dataframe column names from vector. Convert data frame column to vector by subsetting data. They are not in order so i can t simply remove by specifying 1 126. However this time we are using a numeric vector whereby each element of the vector stands for the position of the column. The resulting data frame stores the values of each vector in a different column.

I want to subset the 300 based on not being in my 126. Subscribe to my free statistics newsletter leave a reply cancel reply. The first column of our example data is called x1 and the column at the third position is called x3. In this r tutorial you learned how to append a vector to a data frame.

Drop unused factor levels in a subsetted data frame. How to join merge data frames inner outer left right 520. The r programming language. How to rename a column name in r.

Df1 data frame state c arizona georgia newyork indiana seattle washington texas code c az ga ny in st wt tx score c 62 47. Such as the following which did not work. However there are several other alternatives example 2. This is probably the easiest solution in case you want to convert a data frame column to a vector in r.

If i do test 1 the result is test 1 memory1 memory2 memory3 memory4 memory5 memory6 memory7 memory8 1 7 5 5 5 2 7 5 2 2 5 how do i subset the data frame so that i get just a vector of the numbers without the column names. For that reason the previous r syntax would extract the columns x1 and x3 from our data set. Not negative column select using braces syntax. Let s first create the dataframe.

X has 300 columns. Don t hesitate to let me know in the comments section if you have further questions. 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. In this tutorial we will be looking on how to get the list of column names in the dataframe with an example.

However the column names printed on the first line seem to include the column values separated by dots which is a very strange naming scheme. To get the list of column names of dataframe in r we use functions like names and colnames. It has four rows and three columns. How can i subset rows in a data frame in r based on a vector of values.

Subsetting a dataframe using a vector 1. I created a vector with 126 elements that are the column names of 126 of the 300. I have a data frame with 300 columns of data. Your email address will not be published.

So try running this sequence and maybe things will be clearer. If you want the actual atomic column you could use or somewhat confusingly to me you could do aframe 2 which returns a vector not a sublist. I have a data frame and i would like to subset just the first row.