Re: [R] Changing global variables from functions
Thanks for the help, I've fixed the problem. -Josh Elliott -- View this message in context: http://n4.nabble.com/Changing-global-variables-from-functions-tp1595002p1679330.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list 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.
[R] Changing global variables from functions
Hey all,
I'm relatively new to the R-environment. I'm having a bit of trouble with
encapsulation.
I have a globally declared variable that doesn't update it when I change it
in a function. For example when I run the following function
deckn-NULL
deck1-1 #52 card deck
deck-function()
{
#Creating a standard deck
deck1-c(1:52)
deckn-deck1
#Creating n decks
for (i in 2:num_decks)
{
deckn-c(deckn,52*i+deck1-1)
}
}
deckn
NULL
it returns NULL for deckn instead of a vector of values. Is there an easy
fix to update deckn in the function so that it outputs a vector of values (
I don't wish the function to return a value just update the current one)?
Thanks in advance,
Josh Elliott
--
View this message in context:
http://n4.nabble.com/Changing-global-variables-from-functions-tp1595002p1595002.html
Sent from the R help mailing list archive at Nabble.com.
__
R-help@r-project.org mailing list
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.
Re: [R] Changing global variables from functions
On Mar 16, 2010, at 11:04 AM, jtouyz wrote:
Hey all,
I'm relatively new to the R-environment. I'm having a bit of trouble
with
encapsulation.
I have a globally declared variable that doesn't update it when I
change it
in a function.
For example when I run the following function
deckn-NULL
deck1-1 #52 card deck
deck-function()
{
#Creating a standard deck
deck1-c(1:52)
deckn-deck1
#Creating n decks
for (i in 2:num_decks)
# could be wrong but it appears that you are expecting the act of
putting num_ in front of decks to be interpreted by R as returning
the length of deckn or deck1. That is a higher level of abstraction
than is yet available in any computer language with which I am
familiar. Or perhaps you were intending to use Greg Snow's soon to be
released mind-reading package so that R could know that you wanted it
to be 6?.
Perhaps instead (depending on what the real problem (unstated as yet)
might be:
for (i in 2:length(deck1) ) # or some other object or function
that returns a numeric value.
{
deckn-c(deckn,52*i+deck1-1)
}
}
deckn
You would have needed to assign a return-ed value to deckn in the
outer environment. The deckn object would have disappeared at the end
of the function call, and it would not have needed to be named
deckn, either.
Try instead:
deckn-NULL
deck-function(num_decks=6)
{
#Creating a standard deck
deck1-c(1:52)
deckn-deck1
#Creating n decks
for (i in 2:num_decks)
{
deckn-c(deckn,52*i+deck1-1)
}; return(deckn)
}
deckn - deck()
deckn
Which has a gap between 52 and 104 because of your logic, not mine.
NULL
it returns NULL for deckn instead of a vector of values. Is there an
easy
fix to update deckn in the function so that it outputs a vector of
values (
I don't wish the function to return a value just update the current
one)?
You could, of course, explain what you are trying to do.
Thanks in advance,
Josh Elliott
--
David Winsemius, MD
West Hartford, CT
__
R-help@r-project.org mailing list
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.
Re: [R] Changing global variables from functions
Hi David,
Thank you for your response.
Yes, num_decks was previously defined in my program, I apologize for the
confusion as it is an integral value.
This is only one portion of my program that is being used to simulate card
counting in blackjack.
The basic idea was to modify deckn without having to return a value from the
function deck(). That is whenever deck() was run it would write over
whatever was in deckn (instead of having to input deckn-deck().)
It seems from your response that this may not be possible and return is
always required.
If I have erred, please let me know.
Thanks once again,
Josh Elliott
David Winsemius wrote:
On Mar 16, 2010, at 11:04 AM, jtouyz wrote:
Hey all,
I'm relatively new to the R-environment. I'm having a bit of trouble
with
encapsulation.
I have a globally declared variable that doesn't update it when I
change it
in a function.
For example when I run the following function
deckn-NULL
deck1-1 #52 card deck
deck-function()
{
#Creating a standard deck
deck1-c(1:52)
deckn-deck1
#Creating n decks
for (i in 2:num_decks)
# could be wrong but it appears that you are expecting the act of
putting num_ in front of decks to be interpreted by R as returning
the length of deckn or deck1. That is a higher level of abstraction
than is yet available in any computer language with which I am
familiar. Or perhaps you were intending to use Greg Snow's soon to be
released mind-reading package so that R could know that you wanted it
to be 6?.
Perhaps instead (depending on what the real problem (unstated as yet)
might be:
for (i in 2:length(deck1) ) # or some other object or function
that returns a numeric value.
{
deckn-c(deckn,52*i+deck1-1)
}
}
deckn
You would have needed to assign a return-ed value to deckn in the
outer environment. The deckn object would have disappeared at the end
of the function call, and it would not have needed to be named
deckn, either.
Try instead:
deckn-NULL
deck-function(num_decks=6)
{
#Creating a standard deck
deck1-c(1:52)
deckn-deck1
#Creating n decks
for (i in 2:num_decks)
{
deckn-c(deckn,52*i+deck1-1)
}; return(deckn)
}
deckn - deck()
deckn
Which has a gap between 52 and 104 because of your logic, not mine.
NULL
it returns NULL for deckn instead of a vector of values. Is there an
easy
fix to update deckn in the function so that it outputs a vector of
values (
I don't wish the function to return a value just update the current
one)?
You could, of course, explain what you are trying to do.
Thanks in advance,
Josh Elliott
--
David Winsemius, MD
West Hartford, CT
__
R-help@r-project.org mailing list
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.
--
View this message in context:
http://n4.nabble.com/Changing-global-variables-from-functions-tp1595002p1595356.html
Sent from the R help mailing list archive at Nabble.com.
__
R-help@r-project.org mailing list
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.
Re: [R] Changing global variables from functions
On Mar 16, 2010, at 2:43 PM, jtouyz wrote:
Hi David,
Thank you for your response.
Yes, num_decks was previously defined in my program, I apologize for
the
confusion as it is an integral value.
This is only one portion of my program that is being used to
simulate card
counting in blackjack.
The basic idea was to modify deckn without having to return a value
from the
function deck(). That is whenever deck() was run it would write over
whatever was in deckn (instead of having to input deckn-deck().)
It seems from your response that this may not be possible and
return is
always required.
If I have erred, please let me know.
R is supposed to be used as a functional language. The use of the
- operator is deprecated, so I did not mention that strategy. You
could also have simply run the loop without the functional wrapper.
--
david.
Thanks once again,
Josh Elliott
David Winsemius wrote:
On Mar 16, 2010, at 11:04 AM, jtouyz wrote:
Hey all,
I'm relatively new to the R-environment. I'm having a bit of trouble
with
encapsulation.
I have a globally declared variable that doesn't update it when I
change it
in a function.
For example when I run the following function
deckn-NULL
deck1-1 #52 card deck
deck-function()
{
#Creating a standard deck
deck1-c(1:52)
deckn-deck1
#Creating n decks
for (i in 2:num_decks)
# could be wrong but it appears that you are expecting the act of
putting num_ in front of decks to be interpreted by R as
returning
the length of deckn or deck1. That is a higher level of abstraction
than is yet available in any computer language with which I am
familiar. Or perhaps you were intending to use Greg Snow's soon to be
released mind-reading package so that R could know that you wanted it
to be 6?.
Perhaps instead (depending on what the real problem (unstated as yet)
might be:
for (i in 2:length(deck1) ) # or some other object or function
that returns a numeric value.
{
deckn-c(deckn,52*i+deck1-1)
}
}
deckn
You would have needed to assign a return-ed value to deckn in the
outer environment. The deckn object would have disappeared at the end
of the function call, and it would not have needed to be named
deckn, either.
Try instead:
deckn-NULL
deck-function(num_decks=6)
{
#Creating a standard deck
deck1-c(1:52)
deckn-deck1
#Creating n decks
for (i in 2:num_decks)
{
deckn-c(deckn,52*i+deck1-1)
}; return(deckn)
}
deckn - deck()
deckn
Which has a gap between 52 and 104 because of your logic, not mine.
NULL
it returns NULL for deckn instead of a vector of values. Is there an
easy
fix to update deckn in the function so that it outputs a vector of
values (
I don't wish the function to return a value just update the current
one)?
You could, of course, explain what you are trying to do.
Thanks in advance,
Josh Elliott
--
David Winsemius, MD
West Hartford, CT
__
R-help@r-project.org mailing list
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.
--
View this message in context:
http://n4.nabble.com/Changing-global-variables-from-functions-tp1595002p1595356.html
Sent from the R help mailing list archive at Nabble.com.
__
R-help@r-project.org mailing list
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.
David Winsemius, MD
West Hartford, CT
__
R-help@r-project.org mailing list
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.
Re: [R] Changing global variables from functions
On Mar 16, 2010, at 3:11 PM, David Winsemius wrote:
On Mar 16, 2010, at 2:43 PM, jtouyz wrote:
Hi David,
Thank you for your response.
Yes, num_decks was previously defined in my program, I apologize
for the
confusion as it is an integral value.
This is only one portion of my program that is being used to
simulate card
counting in blackjack.
The basic idea was to modify deckn without having to return a value
from the
function deck(). That is whenever deck() was run it would write over
whatever was in deckn (instead of having to input deckn-deck().)
It seems from your response that this may not be possible and
return is
always required.
If I have erred, please let me know.
R is supposed to be used as a functional language. The use of the
- operator is deprecated, so I did not mention that strategy.
You could also have simply run the loop without the functional
wrapper.
I wondered if a sampling without replacement strategy might work to
provide with indexing:
num_deck # what fills shoes these days.
( table((1:52)[sample(1:(52*num_decks), 52*num_decks) %% 52])
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
24 25 26 27 28 29 30
6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6
6 6 6 6 6 6 6
31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6
--
David.
--
david.
Thanks once again,
Josh Elliott
David Winsemius wrote:
On Mar 16, 2010, at 11:04 AM, jtouyz wrote:
Hey all,
I'm relatively new to the R-environment. I'm having a bit of
trouble
with
encapsulation.
I have a globally declared variable that doesn't update it when I
change it
in a function.
For example when I run the following function
deckn-NULL
deck1-1 #52 card deck
deck-function()
{
#Creating a standard deck
deck1-c(1:52)
deckn-deck1
#Creating n decks
for (i in 2:num_decks)
# could be wrong but it appears that you are expecting the act of
putting num_ in front of decks to be interpreted by R as
returning
the length of deckn or deck1. That is a higher level of abstraction
than is yet available in any computer language with which I am
familiar. Or perhaps you were intending to use Greg Snow's soon to
be
released mind-reading package so that R could know that you wanted
it
to be 6?.
Perhaps instead (depending on what the real problem (unstated as
yet)
might be:
for (i in 2:length(deck1) ) # or some other object or function
that returns a numeric value.
{
deckn-c(deckn,52*i+deck1-1)
}
}
deckn
You would have needed to assign a return-ed value to deckn in the
outer environment. The deckn object would have disappeared at the
end
of the function call, and it would not have needed to be named
deckn, either.
Try instead:
deckn-NULL
deck-function(num_decks=6)
{
#Creating a standard deck
deck1-c(1:52)
deckn-deck1
#Creating n decks
for (i in 2:num_decks)
{
deckn-c(deckn,52*i+deck1-1)
}; return(deckn)
}
deckn - deck()
deckn
Which has a gap between 52 and 104 because of your logic, not mine.
NULL
it returns NULL for deckn instead of a vector of values. Is there
an
easy
fix to update deckn in the function so that it outputs a vector of
values (
I don't wish the function to return a value just update the current
one)?
You could, of course, explain what you are trying to do.
Thanks in advance,
Josh Elliott
--
David Winsemius, MD
West Hartford, CT
__
R-help@r-project.org mailing list
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.
--
View this message in context:
http://n4.nabble.com/Changing-global-variables-from-functions-tp1595002p1595356.html
Sent from the R help mailing list archive at Nabble.com.
__
R-help@r-project.org mailing list
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.
David Winsemius, MD
West Hartford, CT
__
R-help@r-project.org mailing list
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.
David Winsemius, MD
West Hartford, CT
__
R-help@r-project.org mailing list
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.
