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Hi,

Inside a loop, you must explicitly wrap your summary() command and anything
else from which you expect output in a print() command.

Sarah

2011/10/11 Sergio Ren? Araujo Enciso <araujo.enciso at gmail.com>:
Dear all:

I am having some problems to use the function "sink()". Basically I am doing
a loop over two files which contain unit-root variables. Then on a loop, I
extract every i element of both files to create an object called z. If z
meets some requirements, then I perform a unit root test (ADF test),
otherwise not. As this process is repeated several times, for each i I want
to get the summary of the ADF test on a common file. For that I use the
function "sink()". My code runs fine, but I do not get anything written on
the text file where my results are supposed to be saved. The code is below

setwd("C:\\Users\\Sergio Ren?\\Dropbox\\R")

library("urca")

P1<-read.csv("2R_EQ_P_R1_500.csv")
P2<-read.csv("2R_EQ_P_R2_500.csv")

d<-(1:1000)
sink ("ADF_results_b_1.txt")

for (i in seq(d))
{
z.1<-P1[i]*-1-P2[i]*-1
if (all(z.1<=0)) {r=1} else {if (all(z.1>=0)) {r=1} else {r=2}}
if (r==1) {ADF<-ur.df(ts(z.1), lags=1, type='drift')}
if (r==1) {summary(ADF)}
}
sink()

Any suggestion of what I might be doing wroong?

best regards,

Sergio Ren?

Sarah Goslee
http://www.functionaldiversity.org
Untested, does adding a print() around summary() get it done?

Michael

Dear all:

I am having some problems to use the function "sink()". Basically I am doing
a loop over two files which contain unit-root variables. Then on a loop, I
extract every i element of both files to create an object called z. If z
meets some requirements, then I perform a unit root test (ADF test),
otherwise not. As this process is repeated several times, for each i I want
to get the summary of the ADF test on a common file. For that I use the
function "sink()". My code runs fine, but I do not get anything written on
the text file where my results are supposed to be saved. The code is below

setwd("C:\\Users\\Sergio Ren?\\Dropbox\\R")

library("urca")

P1<-read.csv("2R_EQ_P_R1_500.csv")
P2<-read.csv("2R_EQ_P_R2_500.csv")

d<-(1:1000)
sink ("ADF_results_b_1.txt")

for (i in seq(d))
{
z.1<-P1[i]*-1-P2[i]*-1
if (all(z.1<=0)) {r=1} else {if (all(z.1>=0)) {r=1} else {r=2}}
if (r==1) {ADF<-ur.df(ts(z.1), lags=1, type='drift')}
if (r==1) {summary(ADF)}
}
sink()

Any suggestion of what I might be doing wroong?

best regards,

Sergio Ren?

   [[alternative HTML version deleted]]

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and provide commented, minimal, self-contained, reproducible code.
Dear all:

I am having some problems to use the function "sink()". Basically I am doing
a loop over two files which contain unit-root variables. Then on a loop, I
extract every i element of both files to create an object called z. If z
meets some requirements, then I perform a unit root test (ADF test),
otherwise not. As this process is repeated several times, for each i I want
to get the summary of the ADF test on a common file. For that I use the
function "sink()". My code runs fine, but I do not get anything written on
the text file where my results are supposed to be saved. The code is below

setwd("C:\\Users\\Sergio Ren?\\Dropbox\\R")

library("urca")

P1<-read.csv("2R_EQ_P_R1_500.csv")
P2<-read.csv("2R_EQ_P_R2_500.csv")

d<-(1:1000)
sink ("ADF_results_b_1.txt")

for (i in seq(d))
{
z.1<-P1[i]*-1-P2[i]*-1
if (all(z.1<=0)) {r=1} else {if (all(z.1>=0)) {r=1} else {r=2}}
if (r==1) {ADF<-ur.df(ts(z.1), lags=1, type='drift')}
if (r==1) {summary(ADF)}
}
sink()

Any suggestion of what I might be doing wroong?
You aren't printing anything.  In a loop, you need to call print() 
explicitly; only the last value of an expression auto-prints.

Duncan Murdoch

Dear all:

I am having some problems to use the function "sink()". Basically I  
am doing
a loop over two files which contain unit-root variables. Then on a  
loop, I
extract every i element of both files to create an object called z.  
If z
meets some requirements, then I perform a unit root test (ADF test),
otherwise not. As this process is repeated several times, for each i  
I want
to get the summary of the ADF test on a common file. For that I use  
the
function "sink()". My code runs fine, but I do not get anything  
written on
the text file where my results are supposed to be saved. The code is  
below

setwd("C:\\Users\\Sergio Ren?\\Dropbox\\R")

library("urca")

P1<-read.csv("2R_EQ_P_R1_500.csv")
P2<-read.csv("2R_EQ_P_R2_500.csv")

d<-(1:1000)
sink ("ADF_results_b_1.txt")

for (i in seq(d))
{
z.1<-P1[i]*-1-P2[i]*-1
if (all(z.1<=0)) {r=1} else {if (all(z.1>=0)) {r=1} else {r=2}}
if (r==1) {ADF<-ur.df(ts(z.1), lags=1, type='drift')}
if (r==1) {summary(ADF)}
You may need to print() that summary-object inside the for-function.

 > summary(a)
    Min. 1st Qu.  Median    Mean 3rd Qu.    Max.
    1.00    1.75    2.50    2.50    3.25    4.00
 > sink("test.txt")
 > for(i in 1) summary(a)
 > sink()    # No test.txt file created
 > sink("test2.txt")
 > for(i in 1) print( summary(a) )
 > sink() # The expected file created

This relates to the FAQ about similar puzzling behavior with plotting  
lattice , grid or ggplot objects.
}
sink()

Any suggestion of what I might be doing wroong?

best regards,

Sergio Ren?
David Winsemius, MD
West Hartford, CT
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