How to avoid an empty vector when using the cat() function in R?

Question

I am creating a character vector in which I want to describe information about the columns of my data frame. When I combine text and functions I obtain an empty vector of length 0, for which calling my vector is meaningless.

I am using the cat() function to do this:

columns <- cat("Columns in dataset describe annotations for 28416 genes. Variables:", colnames(DATA)[c(1, 11, 12, 13, 14)], "present descriptive information, variables:", colnames(raw.data), "represent expression data of three experimental conditions.")

When I run this, it works great. I get a paragraph. But when I call my vector, columns, I get: NULL By the way, print and paste are not of use in this example, since they repeat my text for each column name. Which I don't need.

Thanks!

pooja p · Accepted Answer · 2019-01-11 18:44:17Z

1

Paste the colnames as well with collapse

columns <- paste("Columns in dataset describe annotations for 28416 genes. Variables:", paste(colnames(DATA)[c(1, 11, 12, 13, 14)], collapse = " "), "present descriptive information, variables:", paste(colnames(raw.data), collapse = " "), "represent expression data of three experimental conditions.")

answered Jan 11, 2019 at 18:44

pooja p

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