[R] Using options(max.print = 1000000) to read in data

[Richard O'Keefe]

The obvious question is "what do you mean, FORMATTED AS a matrix?"
Once you have read an object into R, you have no information about how it
was formatted.
Another question is "what do you mean, MATRIX"?
Do you mean the kind of R object specifically recognised by is.matrix,
or do you mean "rectangular arrangement of numbers", which would include
data frames as well?
Another obvious question is "how, EXACTLY, are you reading it?"
Why don't you *know* what you read it as?
If you use read.table or any of the other functions listed by ?read.table
you will always get a data frame, which is a rectangular arrangement that
*acts like* a matrix in many ways, but without actually being one.
If you want to read *part* of a file using one of those functions,
skip=M says to ignore the first M lines, and
nrows=N says to read the next N lines,
but the only way one of these functions would read less than all of the
input would be if memory ran out or the input was malformed.



On Tue, 9 Jul 2019 at 02:07, Spencer Brackett <
spbrackett20 using saintjosephhs.com> wrote:

> Hello,
>
>   I am trying to reload some data into R in order to check to see if it is
> formatted as a matrix. I used the command options(max.print = 10000000) to
> account for the 20,000 some rows omitted previously when just using the
> basic version of this function. After entering this command, the dataset
> mostly loaded into R, but 14717 rows were still omitted.
>
>   Can I simply increase the number indicted after 'max.print =' to read in
> the remaining rows, or should I use 'bigfile.sample <-' or
> 'bigfile.colclass <-' instead? Do I even need to read in all of the rows to
> test for a matrix?
>
> Best,
>
> Spencer
>
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