[R] How to use apply() to fill matrix by rows or columns?

[Mike C]

I was using OS X native R editor. I would imagine that editor is as simple and native as it gets. But, if it's truly native, why would Gmail think of my code chunk so differently.
I'm just throwing it out there! I can always remove format in Gmail after pasting as a precaution. :)






On Fri, Feb 24, 2017 at 10:49 PM -0500, "Jeff Newmiller" <jdnewmil at dcn.davis.ca.us> wrote:










I am pretty sure it is not RStudio that is converting it to html... it is Gmail... but many email programs seem to do this these days so that people can send Wingdings symbols to their lolz pals, with no thought of the damage done to computer code examples. 
-- 
Sent from my phone. Please excuse my brevity.

On February 24, 2017 7:37:45 PM PST, C W  wrote:
>Thanks for letting me know. That line does look familiar.
>
>It's interesting how I simply copy and paste from R editor can result
>in
>HTML format.
>
>On Fri, Feb 24, 2017 at 9:16 PM, Jeff Newmiller
>
>wrote:
>
>> There is a little button near the bottom of the Gmail editing box
>that
>> switches to plain text. We can immediately tell because of the
>>
>> [[alternative HTML version deleted]]
>>
>> line when we receive it, and sometimes it loses all of the line
>breaks or
>> has extra asterisks mixed in. You can look in the archives or replies
>to
>> see what we see.
>> --
>> Sent from my phone. Please excuse my brevity.
>>
>> On February 24, 2017 5:55:15 PM PST, C W  wrote:
>> >I suppose for loop will suffice.
>> >
>> >I simply copy & paste the code from R editor. From my email, it
>looks
>> >plain. Is there a way to tell?
>> >
>> >On Fri, Feb 24, 2017 at 8:50 PM, Jeff Newmiller
>> >
>> >wrote:
>> >
>> >> 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 
>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
>> >> >
>> >> >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 
>> >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 at 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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