r drop column

R – Drop data frame columns by name – Stack Overflow

EDIT : For those still not acquainted with the drop argument of the indexing function, if you want to keep one column as a data frame, you do: keeps < y DF[ , keeps, drop = FALSE]. drop=TRUE (or not mentioning it) will drop unnecessary dimensions, and hence return a vector with the values of column y .

Dataframe – Remove an entire column from a data.frame in R – Stack …

You can set it to NULL . > Data$genome < NULL > head(Data) chr region 1 chr1 CDS 2 chr1 exon 3 chr1 CDS 4 chr1 exon 5 chr1 CDS 6 chr1 exon. As pointed out in the comments, here are some other possibilities: Data[2] < NULL # Wojciech Sobala Data[[2]] < NULL # same as above Data < Data[,2] ...

R – How to drop columns by name in a data frame – Stack Overflow

You should use either indexing or the subset function. For example : R> df < data.frame(x=1:5, y=2:6, z=3:7, u=4:8) R> df x y z u 1 1 2 3 4 2 2 3 4 5 3 3 4 5 6 4 4 5 6 7 5 5 6 7 8. Then you can use the which function and theoperator in column indexation : R> df[ , which(names(df) %in% c(z,u))] x y 1 1 2 2 …

R : Keep / Drop Columns from Data Frame – Listen Data

R : Keep / Drop Columns from Data Frame. The article below explains how to keep or drop variables (columns) from data frame. In R, there are multiple ways to select or drop column. The following code creates a sample data frame that is used for demonstration.

How to delete a column from a data frame in R? – tools – Data …

Hi, I am new to R and I wanted to delete column number 14 from my data frame of 21 variables? I want the column to be deleted, and not set to NULL or something, so that the columns after 14 get their numbers reassigned. …

Quick-R: Subsetting Data

Subsetting Data. R has powerful indexing features for accessing object elements. These features can be used to select and exclude variables and observations. The following code snippets demonstrate ways to keep or delete variables and observations and to take random samples from a dataset.

[R] Is there a quicker way to drop a data frame column than …

Hello, You can always use df < subset( df, select = c(x, y, z) ) Best regards, Carlos J. Gil Bellosta http://www.datanalytics.com Dimitri Shvorob wrote: > If I want to drop columns x, y, z from dataframe df, is there a better > alternative to > > df$x = NULL > df$y = NULL > df$z = NULL > > There are sufficiently many …

[R] Drop column from a data frame

On Dec 26, 2010, at 8:22 PM, John Sorkin wrote: > I am trying to drop a column of a data frame. The code below > attempts to drop a numeric column (which does not work but gives no > error or warning) and a factor column (which does not work but gives > an error). > I would appreciate someone telling …

Adding and removing columns from a data frame – Cookbook for R

data < read.table(header=TRUE, text=' id weight 1 20 2 27 3 24 ') # Ways to add a column data$size < c(small, large, medium) data[[size]] < c(small, large, medium) data[,size] < c(small, large, medium) data$size < 0 # Use the same value (0) for all rows # Ways to remove the column data$size < NULL ...

R help – Removing columns from data frame referenced by column …

Removing columns from data frame referenced by column index. Can you suggest me any way to remove a column of a data frame by the column number, not by the column name. Thanks, Suman…

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