[R] Error using return() function inside for loop and if statement
Dear all, I get an error using the return function. The following is a
simpler version.
for (j in 1:10)
{
samples = 5*j
return(samples)
}
Error: no function to return from, jumping to top level
Similar warning happens with if statement.
Why do I get an error? print() works fine. I don't see anywhere in the
documentation says that return() is not allowed inside for loop.
I know the list is for advanced computation topics, and I don't want to
bother the list too much. Where should I look for things like this in the
future?
?return() nor the R documentation does not mention any of this.
Bob
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Re: [R] Error using return() function inside for loop and if statement
The error message should make it pretty clear -- you aren't inside a
function so you can't return() a value which is, by definition, what
functions (and only functions) do.** Not sure there's a great
reference for this though beyond the error message
Incidentally, what are you trying to do here? The code doesn't really
make much sense to me -- do you just want samples = 5*(1:10) ?
Michael
** I think there's a subtlety glossed over herein: functional
programming purists can wince silently if they so choose.
On Tue, Apr 10, 2012 at 11:17 PM, C W tmrs...@gmail.com wrote:
Dear all, I get an error using the return function. The following is a
simpler version.
for (j in 1:10)
{
samples = 5*j
return(samples)
}
Error: no function to return from, jumping to top level
Similar warning happens with if statement.
Why do I get an error? print() works fine. I don't see anywhere in the
documentation says that return() is not allowed inside for loop.
I know the list is for advanced computation topics, and I don't want to
bother the list too much. Where should I look for things like this in the
future?
?return() nor the R documentation does not mention any of this.
Bob
[[alternative HTML version deleted]]
__
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-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] Error using return() function inside for loop and if statement
Thanks.
So, I want the function to return results from the if statement.
bob - function(var1, func)
{
#func: a simple function
num1 - var1
num2 - func(var1)
if(ruinf(1)num1)
{
return(num1)
}else{
return(num2)
}
}
And then, run 20 iterations of the function.
On Tue, Apr 10, 2012 at 11:26 PM, R. Michael Weylandt
michael.weyla...@gmail.com wrote:
The error message should make it pretty clear -- you aren't inside a
function so you can't return() a value which is, by definition, what
functions (and only functions) do.** Not sure there's a great
reference for this though beyond the error message
Incidentally, what are you trying to do here? The code doesn't really
make much sense to me -- do you just want samples = 5*(1:10) ?
Michael
** I think there's a subtlety glossed over herein: functional
programming purists can wince silently if they so choose.
On Tue, Apr 10, 2012 at 11:17 PM, C W tmrs...@gmail.com wrote:
Dear all, I get an error using the return function. The following is a
simpler version.
for (j in 1:10)
{
samples = 5*j
return(samples)
}
Error: no function to return from, jumping to top level
Similar warning happens with if statement.
Why do I get an error? print() works fine. I don't see anywhere in the
documentation says that return() is not allowed inside for loop.
I know the list is for advanced computation topics, and I don't want to
bother the list too much. Where should I look for things like this in
the
future?
?return() nor the R documentation does not mention any of this.
Bob
[[alternative HTML version deleted]]
__
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.
[[alternative HTML version deleted]]
__
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] Error using return() function inside for loop and if statement
You don't need to return() from the for loop -- just put your outputs
in a variable:
set.seed(1) # For reproducibility
x - numeric(20)
for(i in 1:20) x[i] - bob(0.5, sqrt)
or (more elegant but basically the same thing)
set.seed(1)
x1 - replicate(20, bob(0.5, sqrt)) # Same calculation done 20x and
results collected
but what's best is to make your code vectorized (which is pretty
straightforward here):
bob - function(var1, func)
{
func - match.fun(func) # Make sure it's a function
return(ifelse(runif(length(var1)) var1, var1, func(var1)))
}
set.seed(1)
x2 - bob(rep(0.5, 20), sqrt)
identical(x, x1) # TRUE
identical(x, x2) # TRUE
Incidentally, you don't need the return() for the simplified version
of bob() because the function only has one possible end-point and, by
default, returns the result of the last calculation.
Best,
Michael
On Tue, Apr 10, 2012 at 11:56 PM, C W tmrs...@gmail.com wrote:
Thanks.
So, I want the function to return results from the if statement.
bob - function(var1, func)
{
#func: a simple function
num1 - var1
num2 - func(var1)
if(ruinf(1)num1)
{
return(num1)
}else{
return(num2)
}
}
And then, run 20 iterations of the function.
On Tue, Apr 10, 2012 at 11:26 PM, R. Michael Weylandt
michael.weyla...@gmail.com wrote:
The error message should make it pretty clear -- you aren't inside a
function so you can't return() a value which is, by definition, what
functions (and only functions) do.** Not sure there's a great
reference for this though beyond the error message
Incidentally, what are you trying to do here? The code doesn't really
make much sense to me -- do you just want samples = 5*(1:10) ?
Michael
** I think there's a subtlety glossed over herein: functional
programming purists can wince silently if they so choose.
On Tue, Apr 10, 2012 at 11:17 PM, C W tmrs...@gmail.com wrote:
Dear all, I get an error using the return function. The following is a
simpler version.
for (j in 1:10)
{
samples = 5*j
return(samples)
}
Error: no function to return from, jumping to top level
Similar warning happens with if statement.
Why do I get an error? print() works fine. I don't see anywhere in the
documentation says that return() is not allowed inside for loop.
I know the list is for advanced computation topics, and I don't want to
bother the list too much. Where should I look for things like this in
the
future?
?return() nor the R documentation does not mention any of this.
Bob
[[alternative HTML version deleted]]
__
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-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.
