[R] writing function ( 'plot' and 'if') problem

2010-04-13 Thread casperyc

===
myf=function(ds=1){
x=rnorm(10)
y=rnorm(10)

{ #start of if
if (ds==1)
{
list(x,y)
}

else (ds==2)
{
plot(x,y)
}

} # end of if

} # end of function
===

Hi All,

the problem i am having here is,
that I want to be able to control the display,
lf ds=1, i want to just have a list,

but it seem to always plot...

Thanks.

casper
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Re: [R] writing function ( 'plot' and 'if') problem

2010-04-13 Thread Peter Alspach
Tena koe Caspar

Try removing the (ds==2) - I'm not sure how you expect R to interpret
that.

HTH 

Peter Alspach

 -Original Message-
 From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-
 project.org] On Behalf Of casperyc
 Sent: Wednesday, 14 April 2010 10:42 a.m.
 To: r-help@r-project.org
 Subject: [R] writing function ( 'plot' and 'if') problem
 
 
 ===
 myf=function(ds=1){
 x=rnorm(10)
 y=rnorm(10)
 
 { #start of if
 if (ds==1)
 {
 list(x,y)
 }
 
 else (ds==2)
 {
 plot(x,y)
 }
 
 } # end of if
 
 } # end of function
 ===
 
 Hi All,
 
 the problem i am having here is,
 that I want to be able to control the display,
 lf ds=1, i want to just have a list,
 
 but it seem to always plot...
 
 Thanks.
 
 casper
 --
 View this message in context: http://n4.nabble.com/writing-function-
 plot-and-if-problem-tp1839091p1839091.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.

__
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Re: [R] writing function ( 'plot' and 'if') problem

2010-04-13 Thread casperyc

what i am triyng to do is

when ds=1
give me a list

ds=2
plot

Thanks

casper
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Re: [R] writing function ( 'plot' and 'if') problem

2010-04-13 Thread David Winsemius


On Apr 13, 2010, at 5:41 PM, casperyc wrote:



===
myf=function(ds=1){
x=rnorm(10)
y=rnorm(10)

{ #start of if
if (ds==1)
{
list(x,y)
}

else (ds==2)


?if

That seems odd. I would expect this function to return TRUE or FAKSE  
rather than proceeding to a plot function. There is not usually a  
condition following the else{} step.


--
David.


{
plot(x,y)
}

} # end of if

} # end of function
===

Hi All,

the problem i am having here is,
that I want to be able to control the display,
lf ds=1, i want to just have a list,

but it seem to always plot...

Thanks.

casper
--
View this message in context: 
http://n4.nabble.com/writing-function-plot-and-if-problem-tp1839091p1839091.html
Sent from the R help mailing list archive at Nabble.com.

__
R-help@r-project.org mailing list
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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
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and provide commented, minimal, self-contained, reproducible code.


Re: [R] writing function ( 'plot' and 'if') problem

2010-04-13 Thread David Winsemius


On Apr 13, 2010, at 5:41 PM, casperyc wrote:



===
myf=function(ds=1){
x=rnorm(10)
y=rnorm(10)

{ #start of if
if (ds==1)
{
list(x,y)
}

else (ds==2)
{
plot(x,y)
}

} # end of if

} # end of function
===

Hi All,

the problem i am having here is,
that I want to be able to control the display,
lf ds=1, i want to just have a list,a


Perhaps taking out the entirely extraneous condition for else and  
linking up the else clause:


myf=function(ds=1){
 x=rnorm(10)
 y=rnorm(10)

  #start of if
 if (ds==1)
 {
 list(x,y)
 } else {
 plot(x,y) }

 } # end of if


 myf(1)
[[1]]
 [1] -0.5738623  0.6937577 -1.0801386  0.9465693  1.0054440  
-1.5523713  1.5912727  0.5426036  1.8980418 -0.5922542


[[2]]
 [1] -1.4519795 -0.1556495 -2.5242081 -0.6671736  0.5947123  
-0.6051199 -1.3711271  0.1647910  0.1616131 -0.2563056


--
David.



but it seem to always plot...

Thanks.

casper
--
View this message in context: 
http://n4.nabble.com/writing-function-plot-and-if-problem-tp1839091p1839091.html
Sent from the R help mailing list archive at Nabble.com.

__
R-help@r-project.org mailing list
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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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and provide commented, minimal, self-contained, reproducible code.


Re: [R] writing function ( 'plot' and 'if') problem

2010-04-13 Thread RICHARD M. HEIBERGER
The spurious condition (ds==2) is actually interpreted as the action taken
by the else statement.

Then the braced plot statement is seen as the next statement after the
conclusion of the
   if () {} else ()
statement.

[[alternative HTML version deleted]]

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Re: [R] writing function ( 'plot' and 'if') problem

2010-04-13 Thread David Winsemius


On Apr 13, 2010, at 10:58 PM, RICHARD M. HEIBERGER wrote:



The spurious condition (ds==2) is actually interpreted as the action  
taken by the else statement.


Then the braced plot statement is seen as the next statement after  
the conclusion of the

   if () {} else ()
statement.



I did take out the condition, and it still failed so I then took out  
the cr's.


--
David.

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