Calculate the mean by column

[alx]

When I try the command for calculating the mean in RStudio I receive an error message.

res <- mean(recup$columnName, na.rm = TRUE)

This lead me to reading up on StackOverflow, then I tried the alternative commands.

lapply(results, mean, na.rm = TRUE)

I receive the same error only with 'In mean.default(X[[i]], ...) :' included in the message.

[FJCC]

The error message says the column is not numerical or logical. What do you get when you run

class(recup$columnName)

What is the output of

head(recup$columnName)

[alx]

@FJCC

When I run your first command I get:

[1] "NULL"

The output of the second command is:

NULL

[FJCC]

You need to substitute the actual column name for columnName. For example, you wrote

@alx

res <- mean(recup$columnName, na.rm = TRUE)

Whatever you use as the column name in that command, use the same thing in the commands I wrote.
Maybe

class(recup$med

would be correct.

[williaml]

Perhaps share a reproducible example of your dataset?

FAQ: How to do a minimal reproducible example ( reprex ) for beginners

A minimal reproducible example consists of the following items: A minimal dataset, necessary to reproduce the issue The minimal runnable code necessary to reproduce the issue, which can be run on the given dataset, and including the necessary information on the used packages. Let's quickly go over each one of these with examples: Minimal Dataset (Sample Data) You need to provide a data frame that is small enough to be (reasonably) pasted on a post, but big enough to reproduce your issue. Let's say, as an example, that you are working with the iris data frame head(iris) #> Sepal.Length Sepal.Width Petal.Length Petal.Width Species #> 1 5.1 3.5 1.4 0.…