The apply function is one of many alienate ways to write a loop. It is not
appreciably more efficient in cpu time than a for loop.
Your example creates the numbers in the loop... does your actual data get
created in a loop? If so then your original code should be perfectly
serviceable. If not then there might be a better way to do this, but you would
have to expand your example to illustrate how the data comes to you in order to
suggest alternatives.
Also post using plain text to prevent your code from being mangled on its way
to us.
--
Sent from my phone. Please excuse my brevity.
On February 24, 2017 5:27:07 PM PST, C W <tmrs...@gmail.com> wrote:
>In theory, I am generating from group 5 groups of random numbers, each
>group has 3 samples.
>
>Isn't apply() the replacement of loops?
>
>On Fri, Feb 24, 2017 at 8:23 PM, Jeff Newmiller
><jdnew...@dcn.davis.ca.us>
>wrote:
>
>> What is wrong with
>>
>> dat <- matrix(rnorm(15), nrow=5, ncol = 3)
>>
>> ?
>>
>> And what is this "no loop drama" you refer to? I use loops frequently
>to
>> loop around large memory gobbling chunks of code.
>>
>> --
>> Sent from my phone. Please excuse my brevity.
>>
>> On February 24, 2017 5:02:46 PM PST, C W <tmrs...@gmail.com> wrote:
>> >Dear R,
>> >
>> >I wanted to simulate a 5 by 3 matrix which fills up by either rows
>or
>> >columns?
>> >
>> >I started with the following filling the matrix by rows,
>> >
>> >dat <- matrix(NA, nrow=5, ncol = 3)
>> >
>> >for(i in 1:5){
>> >
>> > dat[i, ] <- rnorm(3)
>> >
>> >}
>> >
>> >But, R is known for no loop drama. Any suggestions?
>> >
>> >Thanks!
>> >
>> > [[alternative HTML version deleted]]
>> >
>> >______________________________________________
>> >R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> >https://stat.ethz.ch/mailman/listinfo/r-help
>> >PLEASE do read the posting guide
>> >http://www.R-project.org/posting-guide.html
>> >and provide commented, minimal, self-contained, reproducible code.
>>
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