I notice that if the row names of the dataframe follows a sequence of numbers from 1 to the number of rows. The row names of the dataframe will disappear after using as.matrix. But the row names re...

I have a data frame like this: df VALUE ABS_CALL DETECTION P-VALUE 1007_s_at "957.729231881542" "P" "0.00486279317241156" 1053_at "320.632701283368" "P" "0.0313356324173416" 117_at "429.842...

I wonder why two data frames a and b have different outcomes when a non-existent rowname is retrieved. For example, a <- as.data.frame(matrix(1:3, ncol = 1, nrow = 3, dimnames = list(c("A1&...

Given a data.frame A, how can I use subscripted rows and columns names? Eventually I want produce a table through kable() in rmarkdown (output: word document). A <- data.frame(round(replicate(3,...

I have a selected group of genes I would like to plot which I have renamed. But when plotting them I also get the NAs for the non-selected. How could I remove the NAs only plotting my selected gene...

I have this df: df <- structure(list(a = 1:5, b = 6:10, c = 11:15, d = c("a", "b", "c", "d", "e"), e = 1:5), row.names = c(NA, -5L), class = c(...

Let's say I have created the following matrix: > x <- matrix(1:20000,nrow=100) > x[1:10,1:10] [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [1,] 1 101 201 301 401 501 601 701 801 9...

For example, in the mtcars dataset, how do I rename the row Merc 280 and call it Some Mercedes? All other posts seem to answer how to replace all row names at once.

I want to convert a matrix to a data frame. When I use df <- mat %>% data.frame() , I lose the rownames. How do I keep them?

I have a data.frame: target_id sample1 sample10 sample100 sample101 sample102 sample103 1: ENST00000000233 9 0 3499.51 0 0 0 2: ENST00000000412 0 0 0.00 0 0 0 3: ENST00000000442 0 0 0.00 0 0...

I have matrix g: > g[1:5,1:5] rs7510853 rs10154488 rs12159982 rs2844887 rs2844888 NA06985 "CC" "CC" "CC" "CC" "CC" NA06991 "CC" &quo...

I would like to plot a table with ggplot, however, I cannot seem to manage to lose the row.names. I have tried: row.names(cov_table_a)<-NULL # outside the plot row.names = FALSE # inside the ann...

I gather data from 4 df's and would like to merge them by rownames. I am looking for an efficient way to do this. This is a simplified version of the data I have. df1 <- data.frame(N= sample(seq...

I've run into the following issue vec <- c("a11","b21","c31") df <- data.frame(a = c(0,0,0), b = c(1,1,1), row.names = vec) df["a",] returns df["...

Could someone explain me why I get different results in my last two lines of code (identical() calls) below? These two objects seem to be identical objects, but when I use them in an apply function...

I have a data frame like this: x1 x2 x3 271 3 5 2 553 2 4 1 563 2 5 3 When I try to select a row based on the row name, e.g. 271, it errors: df[271, ] # Error in xj[i, , drop = FALSE] : subscript...

I have a list of .csv files that I have read in to R and placed in a large data frame called data that consists of 6 data.frames which are the 6 files in filenames. My code so far is: filenames &...

I have a matrix with rownames that are dates. I want to extract these row names into a variable, and then use rownames() to apply these dates to another matrix I have. Let's say the matrix is calle...

Do the following function pairs generate exactly the same results? Pair 1) names() & colnames() Pair 2) rownames() & row.names()

I'd like to merge a bunch of data frames together (because it seems many operations are easier if you're only dealing w/ one, but correct me if I'm wrong). Currently I have one data frame like thi...