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I was searching for some approaches to unlist matrices and I think the most efficient and simplest one is

do.call(rbind, matrix_to_unlist). I tried it and it works but I have no idea why. rbind() function is designed to add a row to matrix/data frame so how is this possible to work ? Could you please explain to me what exactly do.call() is doing with rbind() function that in output we get matrix unlisted ?

John
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  • It calls the internal function do.call to invoke it – akrun Oct 14 '20 at 20:05
  • But to invoke what ? rbind ? How calling rbind unlists matrix ?? – John Oct 14 '20 at 20:15
  • THere are some links like [this](https://stackoverflow.com/questions/10801750/whats-the-difference-between-lapply-and-do-call) or [this](https://stackoverflow.com/questions/38863018/in-r-why-does-using-do-call-change-the-result) that could help you – akrun Oct 14 '20 at 20:16

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If you check the help file of do.call, it reads

do.call constructs and executes a function call from a name or a function and a list of arguments to be passed to it.

So, let suppose, you have

matrices_in_list <- list(matrix_a, matrix_b, ...)

so, when you run do.call(rbind, matrices_in_list), then it is equivalent to:

rbind(matrix_a, matrix_b, ...)

You can call cbind to bind your matrices by column.

Neeraj
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