do.call & call Functions in R (3 Examples) | How to Execute a Function by Its Name | eval Expression

R code of this video:

x1 ＜- 1:10 # Example vector
x1 # Print example vector

sum(x1) # Comparison with conventional syntax

x2 ＜- c(x1, NA) # Example vector with NA
x2 # Print example vector

my_call # Return output of call function

eval(my_call) # Apply eval function to call object

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[agsoutas]

First time I am introduced to the Eval function, thank you, Joachim!!

[idmanic]

Why does the na.rm = TRUE go inside the list function on line 14? Should it not be the third argument for the do.call function? Thanks!

[ahmadalarfaj]

Hallow. Good evening
I would like to ask you about turning the class of the expression to function.

Kind regards

[haraldurkarlsson]

R has thousands of built-in commands and functions. Do you know (perhaps there is a list or study somewhere) what the top most used commands/functions are? For instance which are essential for teaching beginners - e.g. top 20 - to get them started? I am asking from the perspective of someone getting ready to teach a class using R on a university level (grad students and possibly upper-level undergraduates in the physical sciences).

[cristianriccio]

Thanks for this informative video! Why do people use this do.call() function? It just seems more complicated than just using the function without the do.call. I don't understand the benefit!