[R] return() in nested functions
Dear WizaRds,
After consulting different sources I am still unable to understand the
correct use of return() in nested functions. To illustrate the problem:
f - function(x,y,type){
est1-function(x,y){
z=x+y
out(x,y,z)}
est2-function(x,y){
z=x*y
out(x,y,z)}
out-function(x,y,z)
return(x,y,z)
if (type==est1) est1(x,y)
if (type==est2) est2(x,y)
}
test-f(1,2,type=est1) # gives Null for test
However, without the second 'if' condition, it works properly:
Warning message:
multi-argument returns are deprecated in: return(x, y, z)
test
$x
[1] 1
$y
[1] 2
$z
[1] 3
Basically, the function I am working on is of the above structure, be it
more complex. I would like f to return the results of function 'out' to
the user in the assigned variable, e.g. 'test'. i did consult try() and
tryCatch(), but it doesn't seem to be what I am looking for.
Thank you for your help and understanding
mark
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Re: [R] return() in nested functions
On 14/07/2007 7:16 AM, Mark Hempelmann wrote:
Dear WizaRds,
After consulting different sources I am still unable to understand the
correct use of return() in nested functions. To illustrate the problem:
return() knows nothing about nested functions. It just returns from the
current function.
In most respects, nested functions are just like any other functions in
R. The only important difference is the attached environment, which
affects what is visible from within the function, and where - stores
results.
f - function(x,y,type){
est1-function(x,y){
z=x+y
out(x,y,z)}
est2-function(x,y){
z=x*y
out(x,y,z)}
out-function(x,y,z)
return(x,y,z)
Don't ignore the warning you saw from this! Deprecated things
eventually become defunct. You want return(list(x, y, z))
if (type==est1) est1(x,y)
if (type==est2) est2(x,y)
}
test-f(1,2,type=est1) # gives Null for test
The result of the first if is the value from the call to est1. The
result of the second if is NULL. That's what your function returned.
If you had wrapped those calls in return() you'd get what I think you
expected:
if (type==est1) return(est1(x,y))
if (type==est2) return(est2(x,y))
because the return() causes the function to exit and return a value.
Duncan Murdoch
However, without the second 'if' condition, it works properly:
Warning message:
multi-argument returns are deprecated in: return(x, y, z)
test
$x
[1] 1
$y
[1] 2
$z
[1] 3
Basically, the function I am working on is of the above structure, be it
more complex. I would like f to return the results of function 'out' to
the user in the assigned variable, e.g. 'test'. i did consult try() and
tryCatch(), but it doesn't seem to be what I am looking for.
Thank you for your help and understanding
mark
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[R] return()
Dear R Help, Why is it that if you try to return more than one objects using return(), it says it is 'deprecated'? So how do I return more than 1 objects back to the parent function? Thanks, Tim __ R-help@stat.math.ethz.ch 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] return()
Well, put it in a list and return that list. It's all written in ?return by the way. [EMAIL PROTECTED] wrote: Dear R Help, Why is it that if you try to return more than one objects using return(), it says it is 'deprecated'? So how do I return more than 1 objects back to the parent function? Thanks, Tim __ R-help@stat.math.ethz.ch 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-help@stat.math.ethz.ch 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] return()
On 12/18/2006 6:06 AM, [EMAIL PROTECTED] wrote: Dear R Help, Why is it that if you try to return more than one objects using return(), it says it is 'deprecated'? So how do I return more than 1 objects back to the parent function? Put them in a list, e.g. return(a,b) should be coded as return(list(a,b)) Duncan Murdoch __ R-help@stat.math.ethz.ch 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] return tree from .Call
Please see the posting guide: low-level programming questions to R-devel.
On Mon, 21 Aug 2006, Sender wrote:
Hello:
I was hoping to get some advice about how to return a tree (basically a
linked list -- with each node containing a parent, left, and right node
pointers) from a C routine back into R. Each node itself contains several
attributes (a double, a char *, an int, and a void * )
Initially I was thinking I could just return to R a SEXP containing a
pointer to the Root Node, but then realized that the pointer would be
useless since C probably frees the memory after I leave the routine.
That's not true in general: it depends how you allocated them. With
malloc, you need to do a free. External pointer types and finalizers are
available for just this, and you can also use the memory of R structures.
Since trees vary in length (or height) I need to be able to loop thru the
tree until all Nodes have been visited and saved in a SEXP. I'm really new
to handling R objects from within C, and converting and returning a large
tree structure is daunting. Here is some rough code I was thinking about
using to do this. Any suggestions or help will be greatly appreciated!
Since elements of a protected list are protected, you can simplify the use
of PROTECTs (and may have to in order to avoid overflows) by linking into
a list at allocation time. Do node first, then its elements.
SEXP list ;
PROTECT( list = allocVector(VECSXP, tree-size) ) ;
for( i = 0; i tree-size; ++i ){
SEXP node, tree_double, tree_char, tree_int, tree_voidPTR ;
PROTECT( tree_double = NEW_NUMERIC( tree-weight ) ) ;
PROTECT( tree_char = NEW_CHARACTER( tree-name ) ) ;
PROTECT( tree_int = NEW_INTEGER( tree-exons ) ) ;
PROTECT( tree_voidPTR = NEW_CHARACTER( tree-data ) ) ; ??? not sure
about this...
PROTECT( node = allocVector( VECSXP, 4 ) ) ;
SET_VECTOR_ELT( node, 0, tree_double) ;
SET_VECTOR_ELT( node, 1, tree_char) ;
SET_VECTOR_ELT( node, 2, tree_int) ;
SET_VECTOR_ELT( node, 3, tree_voidPTR ) ;
SET_VECTOR_ELT( list, i, node ) ;
}
UNPROTECT( tree-size * 4 ) ; ??? Tricky..
return( list ) ;
Look reasonable ?
THANKS !
[[alternative HTML version deleted]]
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--
Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UKFax: +44 1865 272595
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[R] return tree from .Call
Hello:
I was hoping to get some advice about how to return a tree (basically a
linked list -- with each node containing a parent, left, and right node
pointers) from a C routine back into R. Each node itself contains several
attributes (a double, a char *, an int, and a void * )
Initially I was thinking I could just return to R a SEXP containing a
pointer to the Root Node, but then realized that the pointer would be
useless since C probably frees the memory after I leave the routine.
Since trees vary in length (or height) I need to be able to loop thru the
tree until all Nodes have been visited and saved in a SEXP. I'm really new
to handling R objects from within C, and converting and returning a large
tree structure is daunting. Here is some rough code I was thinking about
using to do this. Any suggestions or help will be greatly appreciated!
SEXP list ;
PROTECT( list = allocVector(VECSXP, tree-size) ) ;
for( i = 0; i tree-size; ++i ){
SEXP node, tree_double, tree_char, tree_int, tree_voidPTR ;
PROTECT( tree_double = NEW_NUMERIC( tree-weight ) ) ;
PROTECT( tree_char = NEW_CHARACTER( tree-name ) ) ;
PROTECT( tree_int = NEW_INTEGER( tree-exons ) ) ;
PROTECT( tree_voidPTR = NEW_CHARACTER( tree-data ) ) ; ??? not sure
about this...
PROTECT( node = allocVector( VECSXP, 4 ) ) ;
SET_VECTOR_ELT( node, 0, tree_double) ;
SET_VECTOR_ELT( node, 1, tree_char) ;
SET_VECTOR_ELT( node, 2, tree_int) ;
SET_VECTOR_ELT( node, 3, tree_voidPTR ) ;
SET_VECTOR_ELT( list, i, node ) ;
}
UNPROTECT( tree-size * 4 ) ; ??? Tricky..
return( list ) ;
Look reasonable ?
THANKS !
[[alternative HTML version deleted]]
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Re: [R] Return a Vector of Positions
(2) Is there a more simpler way to build the vector of positions (versus using append in a loop, as above), using functions such as match() and apply()? How about which.na - function(x) which(is.na(x)) ? Hadley __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
[R] Return a Vector of Positions
Hello,
I wrote a version of which.na (similar to S's) in R that returns a
vector of positions at which NA appears in the target vector v:
which.na-function(v) {
retv - c()
for (i in 1:length(v)) {
if (is.na(v[i])) {
retv-append(i, retv, after = length(retv))
}
}
return(retv)
}
nv - c(2,4,NA,NA)
nas-which.r(nv)
print(nas)
[run]
source(which.r)
[1] 4 3
Two questions about this:
(1) It seems that append actually prepends
(2) Is there a more simpler way to build the vector of positions (versus
using append in a loop, as above), using functions such as match() and
apply()?
Thank You.
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[R] return character
Hi All,
I have several lines of commands, and beacuse I will use these many
times, so I collected
these commands together using a function to describe it. like the following:
my.fun-function(){
.
entertitle()
xaxis-A
yaxis-B
plot(,xlab=xaxis,ylab=yaxis)
...
}
entertitle-function() {
cat(enter the name of A\n)
A-readline()
cat(enter the name of B\n)
B-readline()
return(A,B)
}
I hope the A and B generate form function entertitle can return to
my.fun, and
do the following processing. Am I missing something? Any help as to
where to start would be welcome. Thanks in advanced !!
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Re: [R] return character
On 12/6/05, Judy Chung [EMAIL PROTECTED] wrote:
Hi All,
I have several lines of commands, and beacuse I will use these many
times, so I collected
these commands together using a function to describe it. like the following:
my.fun-function(){
.
entertitle()
xaxis-A
yaxis-B
plot(,xlab=xaxis,ylab=yaxis)
...
}
entertitle-function() {
cat(enter the name of A\n)
A-readline()
cat(enter the name of B\n)
B-readline()
return(A,B)
}
I hope the A and B generate form function entertitle can return to
my.fun, and
do the following processing. Am I missing something? Any help as to
where to start would be welcome. Thanks in advanced !!
Replace the return with:
return(list(A = A, B = B))
and then change the body of my.fun to:
with(entertitle(), {
... rest of function body goes here ...
}
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Re: [R] return unique values from date/time class object
On Tue, 16 Aug 2005, McClatchie, Sam (PIRSA-SARDI) wrote: Background: OS: Linux Mandrake 10.1 release: R 2.1.1 editor: GNU Emacs 21.3.2 front-end: ESS 5.2.3 - Thanks to Brian Ripley (I've upgraded from source, thanks for the reminder) and Petr Pikal for their suggestions, but I have not made clear the form of my data: You missed my comment about POSIXlt objects: convert to POSIXct first. I can't reproduce your error messages, but unique(as.POSIXct(new.time)) works for me. Browse[1] ceduna[1:10,] LSD AVIATION_ID WND_DIR WND_SPD_MPS 1 1/01/2001 10:30:00YCDU 230 4.6 2 1/01/2001 11:00:00YCDU 210 4.1 3 1/01/2001 11:30:00YCDU 230 6.7 4 1/01/2001 12:00:00YCDU 230 7.7 5 1/01/2001 12:30:00YCDU 220 8.2 6 1/01/2001 13:00:00YCDU 210 7.2 7 1/01/2001 13:30:00YCDU 210 7.2 8 1/01/2001 14:00:00YCDU 200 6.7 9 1/01/2001 14:30:00YCDU 190 7.7 10 1/01/2001 15:00:00YCDU 200 8.2 Browse[1] class(ceduna) [1] data.frame Browse[1] x - as.character(ceduna$LSD) Browse[1] new.time - strptime(x, %d/%m/%Y %H:%M:%S) Browse[1] class(new.time) [1] POSIXt POSIXlt Browse[1] unique(new.time) Error in unique.default(new.time) : unique() applies only to vectors Browse[1] tt - new.time[!duplicated(unclass(new.time))] Error in duplicated.default(unclass(new.time)) : duplicated() applies only to vectors Browse[1] I'm obviously doing something silly with the data classes, but what? -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UKFax: +44 1865 272595 __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] return unique values from date/time class object
__ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
[R] return unique values from date/time class object
Background: OS: Linux Mandrake 10.1 release: R 2.0.0 editor: GNU Emacs 21.3.2 front-end: ESS 5.2.3 - Colleagues I have a wind speed time series with a normal frequency distribution and a spike in the 5 metres/second bin. The most likely explanation is that the instrument was returning duplicate values at this speed. To check this, I want to extract all the unique times from the series. However, unique() works with vectors and the object is POSIXt class. I've looked for a similar function to unique() that will work with this class, but have failed to find one. Any suggestions? Thanks Sam Sam McClatchie, Biological oceanography South Australian Aquatic Sciences Centre PO Box 120, Henley Beach 5022 Adelaide, South Australia email [EMAIL PROTECTED] Cellular: 0431 304 497 Telephone: (61-8) 8207 5448 FAX: (61-8) 8207 5481 Research home page http://www.members.iinet.net.au/~s.mcclatchie/ /\ ...xX(° °)Xx / \\ (((° (((° ...xX(°O°)Xx __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] return unique values from date/time class object
Hi Sam It works for me: ss-Sys.time() sss-rep(ss,5) ss-Sys.time() sss-c(sss,ss) sss [1] 2005-08-15 10:04:02 Střední Evropa (letní čas) 2005-08-15 10:04:02 Střední Evropa (letní čas) [3] 2005-08-15 10:04:02 Střední Evropa (letní čas) 2005-08-15 10:04:02 Střední Evropa (letní čas) [5] 2005-08-15 10:04:02 Střední Evropa (letní čas) 2005-08-15 10:04:35 Střední Evropa (letní čas) # six values but only 2 different unique(sss) [1] 2005-08-15 10:04:02 Střední Evropa (letní čas) 2005-08-15 10:04:35 Střední Evropa (letní čas) # 2 values str(sss) 'POSIXct', format: chr [1:6] 2005-08-15 10:04:02 2005-08-15 10:04:02 2005-08-15 10:04:02 2005-08-15 10:04:02 2005- 08-15 10:04:02 ... # posix format as well HTH Petr On 15 Aug 2005 at 16:57, McClatchie, Sam (PIRSA-SARDI) wrote: Background: OS: Linux Mandrake 10.1 release: R 2.0.0 editor: GNU Emacs 21.3.2 front-end: ESS 5.2.3 - Colleagues I have a wind speed time series with a normal frequency distribution and a spike in the 5 metres/second bin. The most likely explanation is that the instrument was returning duplicate values at this speed. To check this, I want to extract all the unique times from the series. However, unique() works with vectors and the object is POSIXt class. I've looked for a similar function to unique() that will work with this class, but have failed to find one. Any suggestions? Thanks Sam Sam McClatchie, Biological oceanography South Australian Aquatic Sciences Centre PO Box 120, Henley Beach 5022 Adelaide, South Australia email [EMAIL PROTECTED] Cellular: 0431 304 497 Telephone: (61-8) 8207 5448 FAX: (61-8) 8207 5481 Research home page http://www.members.iinet.net.au/~s.mcclatchie/ /\ ...xX(° °)Xx / \\ (((° (((° ...xX(°O°)Xx __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Petr Pikal [EMAIL PROTECTED] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
[R] return unique values from date/time class object
Background: OS: Linux Mandrake 10.1 release: R 2.1.1 editor: GNU Emacs 21.3.2 front-end: ESS 5.2.3 - Thanks to Brian Ripley (I've upgraded from source, thanks for the reminder) and Petr Pikal for their suggestions, but I have not made clear the form of my data: Browse[1] ceduna[1:10,] LSD AVIATION_ID WND_DIR WND_SPD_MPS 1 1/01/2001 10:30:00YCDU 230 4.6 2 1/01/2001 11:00:00YCDU 210 4.1 3 1/01/2001 11:30:00YCDU 230 6.7 4 1/01/2001 12:00:00YCDU 230 7.7 5 1/01/2001 12:30:00YCDU 220 8.2 6 1/01/2001 13:00:00YCDU 210 7.2 7 1/01/2001 13:30:00YCDU 210 7.2 8 1/01/2001 14:00:00YCDU 200 6.7 9 1/01/2001 14:30:00YCDU 190 7.7 10 1/01/2001 15:00:00YCDU 200 8.2 Browse[1] class(ceduna) [1] data.frame Browse[1] x - as.character(ceduna$LSD) Browse[1] new.time - strptime(x, %d/%m/%Y %H:%M:%S) Browse[1] class(new.time) [1] POSIXt POSIXlt Browse[1] unique(new.time) Error in unique.default(new.time) : unique() applies only to vectors Browse[1] tt - new.time[!duplicated(unclass(new.time))] Error in duplicated.default(unclass(new.time)) : duplicated() applies only to vectors Browse[1] I'm obviously doing something silly with the data classes, but what? Best fishes Sam Sam McClatchie, Biological oceanography South Australian Aquatic Sciences Centre PO Box 120, Henley Beach 5022 Adelaide, South Australia email [EMAIL PROTECTED] Cellular: 0431 304 497 Telephone: (61-8) 8207 5448 FAX: (61-8) 8207 5481 Research home page http://www.members.iinet.net.au/~s.mcclatchie/ /\ ...xX(° °)Xx / \\ (((° (((° ...xX(°O°)Xx __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
[R] return NA
A-c(1,2,NA,7,5)
B-c(3,4,1,4,1)
C-c(6,5,6,NA,9)
D-c(8,7,4,6,2)
df1-cbind(A,B,C,D)
for(i in seq(1,ncol(df1)-1, by=2)) {
ifelse(df1[,i]==NA,df1[,i+1]==NA,df1[,] ) }
Tried several variations but none worked. I wish to find any NA's in
column's 1 or 3 and change the numerical value to the right of the
NA's . In this case I wish to replace the 1 and 6 respectively with NA.
Any help would be appreciated.
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Re: [R] return NA
You need to use is.na(df1[,i]) to test for NA.
Andy
From: [EMAIL PROTECTED]
A-c(1,2,NA,7,5)
B-c(3,4,1,4,1)
C-c(6,5,6,NA,9)
D-c(8,7,4,6,2)
df1-cbind(A,B,C,D)
for(i in seq(1,ncol(df1)-1, by=2)) {
ifelse(df1[,i]==NA,df1[,i+1]==NA,df1[,] ) }
Tried several variations but none worked. I wish to find any NA's in
column's 1 or 3 and change the numerical value to the right of the
NA's . In this case I wish to replace the 1 and 6
respectively with NA.
Any help would be appreciated.
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http://www.R-project.org/posting-guide.html
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Re: [R] return NA
[EMAIL PROTECTED] wrote:
A-c(1,2,NA,7,5)
B-c(3,4,1,4,1)
C-c(6,5,6,NA,9)
D-c(8,7,4,6,2)
df1-cbind(A,B,C,D)
for(i in seq(1,ncol(df1)-1, by=2)) {
ifelse(df1[,i]==NA,df1[,i+1]==NA,df1[,] ) }
Tried several variations but none worked. I wish to find any NA's in
column's 1 or 3 and change the numerical value to the right of the
NA's . In this case I wish to replace the 1 and 6 respectively with NA.
Any help would be appreciated.
I think you want ?is.na.
for(i in seq(1, ncol(df1) - 1, by = 2))
df1[, i + 1] - ifelse(is.na(df1[, i]), df1[, i], df1[, i + 1])
--sundar
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Re: [R] return NA
Here is a way to do it without a loop that could save some time for a big
dataset.
df1
A B C D
[1,] 1 3 6 8
[2,] 2 4 5 7
[3,] NA 1 6 4
[4,] 7 4 NA 6
[5,] 5 1 9 2
df2-cbind(0,ifelse(is.na(df1),NA,0))[,-ncol(df1)-1]
df2
A B C
[1,] 0 0 0 0
[2,] 0 0 0 0
[3,] 0 NA 0 0
[4,] 0 0 0 NA
[5,] 0 0 0 0
df3-df1+df2
df3
A B C D
[1,] 1 3 6 8
[2,] 2 4 5 7
[3,] NA NA 6 4
[4,] 7 4 NA NA
[5,] 5 1 9 2
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
[EMAIL PROTECTED]
Sent: June 29, 2005 3:50 PM
To: r-help@stat.math.ethz.ch
Subject: [R] return NA
A-c(1,2,NA,7,5)
B-c(3,4,1,4,1)
C-c(6,5,6,NA,9)
D-c(8,7,4,6,2)
df1-cbind(A,B,C,D)
for(i in seq(1,ncol(df1)-1, by=2)) {
ifelse(df1[,i]==NA,df1[,i+1]==NA,df1[,] ) }
Tried several variations but none worked. I wish to find any NA's in
column's 1 or 3 and change the numerical value to the right of the
NA's . In this case I wish to replace the 1 and 6 respectively with NA.
Any help would be appreciated.
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Re: [R] return from nested function?
On Tue, Mar 01, 2005 at 11:21:44PM -0800, Seth Falcon wrote:
On Feb 25, 2005, at 12:34 PM, [EMAIL PROTECTED] wrote:
Is is possible from within a function to cause its caller to return()?
This snippet may be of interest:
f = function(x) {
+ print(f)
+ g(return())
+ print(end of f)
+ }
g=function(x) {print(g)
+ x
+ print(end of g)
+ }
f(1)
[1] f
[1] g
NULL
I may be dumb today, but doesn't that beg the question of how does g
cause f not to return?
Best regards, Jan
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Re: [R] return from nested function?
On Mar 2, 2005, at 4:13 AM, Jan T. Kim wrote: I may be dumb today, but doesn't that beg the question of how does g cause f not to return? No, I think my post doesn't really help you. In the context of a recursive function, the code I posted provides a way to jump out of the recursion which is a cousin of what you are looking for. I wonder if try or tryCatch might be what you want? cheers, + seth __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] return from nested function?
On Feb 25, 2005, at 12:34 PM, [EMAIL PROTECTED] wrote:
Is is possible from within a function to cause its caller to return()?
This snippet may be of interest:
f = function(x) {
+ print(f)
+ g(return())
+ print(end of f)
+ }
g=function(x) {print(g)
+ x
+ print(end of g)
+ }
f(1)
[1] f
[1] g
NULL
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[R] return from nested function?
Is is possible from within a function to cause its caller to return()?
I have a function that lets user make edits to certain objects, and then
checks that the edited objects still make sense. If they don't, the function
puts up a notifier that the edits are being discarded and then returns,
something like:
if(badEdits){
notifyDialog(bad edits will be ignored)
return()
}
else {
## some stuff that assigns the edited objects in the calling frame
return()
}
This works, but I'd really like to put the return() in the notifyDialog()
function. Is there an easy way to do this?
Jeff
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Re: [R] return from nested function?
On Fri, 25 Feb 2005 [EMAIL PROTECTED] wrote:
Is is possible from within a function to cause its caller to return()?
Not as such. You probably want to signal and catch a condition. Look at
?tryCatch.
-thomas
I have a function that lets user make edits to certain objects, and then
checks that the edited objects still make sense. If they don't, the function
puts up a notifier that the edits are being discarded and then returns,
something like:
if(badEdits){
notifyDialog(bad edits will be ignored)
return()
}
else {
## some stuff that assigns the edited objects in the calling frame
return()
}
This works, but I'd really like to put the return() in the notifyDialog()
function. Is there an easy way to do this?
Jeff
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Thomas Lumley Assoc. Professor, Biostatistics
[EMAIL PROTECTED] University of Washington, Seattle
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[R] return value in function
suppose I have a function example:
getMatrix - function(a,b){
A1-diag(1,2,2)
}
If I want to get the both the A1 and dim(A1) from the function, Can I do
return(A1,dim(A1)) inside the function ? And how can I access A1 and dim(A1) later on?
-
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Re: [R] return value in function
suppose I have a function example:
getMatrix - function(a,b){
A1-diag(1,2,2)
}
If I want to get the both the A1 and dim(A1) from the function, Can I do
return(A1,dim(A1)) inside the function ? And how can I access A1 and
dim(A1) later on?
The general approach for this is to use a list
getMatrix - function(a,b){
A1-diag(1,2,2)
list(diag=A1,dim=dim(A1))
}
foo - getMatrix(something)
foo$diag
foo$dim
Cheers
Jason
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RE: [R] return value in function
In general, one would use a list to wrap all objects to be returned into one
object; e.g.,
getMatrix - function(a, b) {
A1 - diag(1,2,2)
return(list(matrix=A1, dim=dim(A1)))
}
You can then access them as:
mat - getMatrix(1,1)
mat$matrix
mat$dim
My question is, why do you need to return the dim of the matrix? The
dimension is already stored in the matrix object as an attribute. Why store
it yet again?
Andy
From: li xian
suppose I have a function example:
getMatrix - function(a,b){
A1-diag(1,2,2)
}
If I want to get the both the A1 and dim(A1) from the
function, Can I do
return(A1,dim(A1)) inside the function ? And how can I access
A1 and dim(A1) later on?
-
[[alternative HTML version deleted]]
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[R] return a list of vectors from C?
I've been working on a shared library that will be called from R. The
functions pass several vectors in and out (residuals, parameters, etc) and I
would like to be able to return a list of objects. I'm familiar with return
single objects (vectors, etc) from a C function, but need a little help for
returning a list of objects.
My code so far looks something like:
/* this function will perform the same tasks as the previous */
/* and return a list of the values rather than just the */
/* optimal values. It should return the optimization info as */
/* well as the residual values from the flikam function */
SEXP testfunc2(
SEXP *pq,
SEXP *obs )
{
int i;
double *pq_vect;
double *obs_vect;
SEXP ret_val;
PROTECT( pq = coerceVector( pq, REALSXP ) );
PROTECT( obs = coerceVector( obs, REALSXP ) );
pq_vect = REAL( pq );
obs_vect = REAL( obs );
/* call my functions for the results */
/* generate the output list */
PROTECT( ret_val = allocVector( VECSXP, NPQ ) );
for( i = 0; i NPQ; i++ )
{
//REAL(ret_val)[i] = XMIN[i];
//PROTECT( ret_val = allocVector( VECSXP, NPQ ) );
//SET_VECTOR_ELT( ret_val, i, 3.14159 );
//SET_VECTOR_ELT( ret_val, i, pq );
/* generate the output vector */
/* PROTECT( ret_val = allocVector( REALSXP, NPQ ) ); */
/* for( i = 0; i NPQ; i++ ) */
/* { */
/* REAL(ret_val)[i] = XMIN[i]; */
/* } */
}
UNPROTECT( 3 );
return ret_val;
}
What package would be a good example of how to do this?
Jeff.
---
Jeff D. Hamann
Forest Informatics, Inc.
PO Box 1421
Corvallis, Oregon USA 97339-1421
(office) 541-754-1428
(cell) 541-740-5988
[EMAIL PROTECTED]
www.forestinformatics.com
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