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Evans, Richard K. (GRC-H000)

2018-May-08 15:51 UTC

[R] help with json data from the web into data frame in R

Right. I'm trying to access a server within my organization which has a cert
error that I cannot fix.

The example link I provided was to a site on the web that does not have the cert
error.

From the linux shell I use the "-k" switch with cURL to ignore cert
errors.. is there an equivalent in the R world?

-Rich


-----Original Message-----
From: David Winsemius [mailto:dwinsemius at comcast.net] 
Sent: Tuesday, May 08, 2018 11:48 AM
To: Evans, Richard K. (GRC-H000)
Cc: Eric Berger; r-help at r-project.org
Subject: Re: [R] help with json data from the web into data frame in R

> On May 8, 2018, at 8:36 AM, Evans, Richard K. (GRC-H000)
<richard.k.evans at nasa.gov> wrote:
> 
> I?ve been tinkering and discovered that the link I need to read json data
from is ?https? and there is a certificate warning that I have to click through
from a browser. That might be my issue. Is there any way in the json package to
tell it to ignore self-signed cert errors in a url?
I didn't have that issue when using the link you offered:

library(jsonlite)
myJSON <- fromJSON(
url("https://www.semantic-mediawiki.org/w/api.php?action=ask&query=%5B%5BCategory:City%5D%5D&format=json")
)

# results in a complex list (not trivially reducible to a dataframe:

str(myJSON)
List of 1
 $ query:List of 5
  ..$ printrequests:'data.frame':	1 obs. of  5 variables:
  .. ..$ label : chr ""
  .. ..$ key   : chr ""
  .. ..$ redi  : chr ""
  .. ..$ typeid: chr "_wpg"
  .. ..$ mode  : int 2
  ..$ results      :List of 39
  .. ..$ File:2166320938 5cfc9ec72a z.jpg                      :List of 6
  .. .. ..$ printouts   : list()
  .. .. ..$ fulltext    : chr "File:2166320938 5cfc9ec72a z.jpg"
  .. .. ..$ fullurl     : chr
"https://www.semantic-mediawiki.org/wiki/File:2166320938_5cfc9ec72a_z.jpg"
#-----trimmed-----------

David
> 
> -Rich
> 
> From: Eric Berger [mailto:ericjberger at gmail.com]
> Sent: Tuesday, May 08, 2018 11:31 AM
> To: Evans, Richard K. (GRC-H000)
> Cc: r-help at r-project.org
> Subject: Re: [R] help with json data from the web into data frame in R
> 
> Hi Rich,
> Take a look at the function fromJSON found in the rjson package.
> Note that the Usage in the help page: ?fromJSON names the second 
> argument 'file' but if you look at the description the argument can
be a URL.
> 
> HTH,
> Eric
> 
> 
> On Tue, May 8, 2018 at 6:16 PM, Evans, Richard K. (GRC-H000)
<richard.k.evans at nasa.gov<mailto:richard.k.evans at nasa.gov>>
wrote:
> Hello
> 
> I am able to construct a url that points to some data online in the JSON
format.  See an example at [0].
> 
> I would like to work with this data as a dataframe in R.
> 
> I know that there is a package for handling json data [1] but it assumes
the data is in a local file but It is not clear to me how to request the data
from the web in an R script and get the json data converted into a data frame in
R.
> 
> Can anyone provide a basic example or some guidance please?
> 
> -Rich (revansx)
> 
> [0] 
> https://www.semantic-mediawiki.org/w/api.php?action=ask&query=[[Catego
>
ry:City]]&format=json<https://www.semantic-mediawiki.org/w/api.php?act
> ion=ask&query=%5b%5bCategory:City%5d%5d&format=json>
> [1] https://www.tutorialspoint.com/r/r_json_files.htm
> 
> ______________________________________________
> R-help at r-project.org<mailto:R-help at r-project.org> mailing list
-- To
> UNSUBSCRIBE and more, see 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 at r-project.org mailing list -- To UNSUBSCRIBE and more, see 
> 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
Alameda, CA, USA

'Any technology distinguishable from magic is insufficiently advanced.' 
-Gehm's Corollary to Clarke's Third Law

Evans, Richard K. (GRC-H000)

2018-May-08 16:03 UTC

head link

[R] help with json data from the web into data frame in R

That said, I have two issues to ask for help with:

1) how to ignore cert errors with a fromJSON call

And 

2) why the json data from the example link doesn't convert to a data frame. 
As seen in the following example

library("rjson")
result <- fromJSON(file =
"https://www.semantic-mediawiki.org/w/api.php?action=ask&query=[[Category:City]]|?Capital%20of|?Has%20area&format=json")
json_data_frame <- as.data.frame(result)
print(json_data_frame)

which results in:
> library("rjson")
Warning message:
package ?rjson? was built under R version 3.4.4 
> result <- fromJSON(file =
"https://www.semantic-mediawiki.org/w/api.php?action=ask&query=[[Category:City]]|?Capital%20of|?Has%20area&format=json")
> json_data_frame <- as.data.frame(result)
Error in (function (..., row.names = NULL, check.rows = FALSE, check.names =
TRUE,  :
  arguments imply differing number of rows: 0, 1
> print(json_data_frame)
Error in print(json_data_frame) : object 'json_data_frame' not found
> 
-----Original Message-----
From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Evans,
Richard K. (GRC-H000)
Sent: Tuesday, May 08, 2018 11:52 AM
To: David Winsemius
Cc: r-help at r-project.org
Subject: Re: [R] help with json data from the web into data frame in R

Right. I'm trying to access a server within my organization which has a cert
error that I cannot fix.

The example link I provided was to a site on the web that does not have the cert
error.

From the linux shell I use the "-k" switch with cURL to ignore cert
errors.. is there an equivalent in the R world?

-Rich


-----Original Message-----
From: David Winsemius [mailto:dwinsemius at comcast.net] 
Sent: Tuesday, May 08, 2018 11:48 AM
To: Evans, Richard K. (GRC-H000)
Cc: Eric Berger; r-help at r-project.org
Subject: Re: [R] help with json data from the web into data frame in R

> On May 8, 2018, at 8:36 AM, Evans, Richard K. (GRC-H000)
<richard.k.evans at nasa.gov> wrote:
> 
> I?ve been tinkering and discovered that the link I need to read json data
from is ?https? and there is a certificate warning that I have to click through
from a browser. That might be my issue. Is there any way in the json package to
tell it to ignore self-signed cert errors in a url?
I didn't have that issue when using the link you offered:

library(jsonlite)
myJSON <- fromJSON(
url("https://www.semantic-mediawiki.org/w/api.php?action=ask&query=%5B%5BCategory:City%5D%5D&format=json")
)

# results in a complex list (not trivially reducible to a dataframe:

str(myJSON)
List of 1
 $ query:List of 5
  ..$ printrequests:'data.frame':	1 obs. of  5 variables:
  .. ..$ label : chr ""
  .. ..$ key   : chr ""
  .. ..$ redi  : chr ""
  .. ..$ typeid: chr "_wpg"
  .. ..$ mode  : int 2
  ..$ results      :List of 39
  .. ..$ File:2166320938 5cfc9ec72a z.jpg                      :List of 6
  .. .. ..$ printouts   : list()
  .. .. ..$ fulltext    : chr "File:2166320938 5cfc9ec72a z.jpg"
  .. .. ..$ fullurl     : chr
"https://www.semantic-mediawiki.org/wiki/File:2166320938_5cfc9ec72a_z.jpg"
#-----trimmed-----------

David
> 
> -Rich
> 
> From: Eric Berger [mailto:ericjberger at gmail.com]
> Sent: Tuesday, May 08, 2018 11:31 AM
> To: Evans, Richard K. (GRC-H000)
> Cc: r-help at r-project.org
> Subject: Re: [R] help with json data from the web into data frame in R
> 
> Hi Rich,
> Take a look at the function fromJSON found in the rjson package.
> Note that the Usage in the help page: ?fromJSON names the second 
> argument 'file' but if you look at the description the argument can
be a URL.
> 
> HTH,
> Eric
> 
> 
> On Tue, May 8, 2018 at 6:16 PM, Evans, Richard K. (GRC-H000)
<richard.k.evans at nasa.gov<mailto:richard.k.evans at nasa.gov>>
wrote:
> Hello
> 
> I am able to construct a url that points to some data online in the JSON
format.  See an example at [0].
> 
> I would like to work with this data as a dataframe in R.
> 
> I know that there is a package for handling json data [1] but it assumes
the data is in a local file but It is not clear to me how to request the data
from the web in an R script and get the json data converted into a data frame in
R.
> 
> Can anyone provide a basic example or some guidance please?
> 
> -Rich (revansx)
> 
> [0] 
> https://www.semantic-mediawiki.org/w/api.php?action=ask&query=[[Catego
>
ry:City]]&format=json<https://www.semantic-mediawiki.org/w/api.php?act
> ion=ask&query=%5b%5bCategory:City%5d%5d&format=json>
> [1] https://www.tutorialspoint.com/r/r_json_files.htm
> 
> ______________________________________________
> R-help at r-project.org<mailto:R-help at r-project.org> mailing list
-- To
> UNSUBSCRIBE and more, see 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 at r-project.org mailing list -- To UNSUBSCRIBE and more, see 
> 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
Alameda, CA, USA

'Any technology distinguishable from magic is insufficiently advanced.' 
-Gehm's Corollary to Clarke's Third Law





______________________________________________
R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
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

2018-May-08 16:25 UTC

head link

[R] help with json data from the web into data frame in R

> On May 8, 2018, at 9:03 AM, Evans, Richard K. (GRC-H000)
<richard.k.evans at nasa.gov> wrote:
> 
> That said, I have two issues to ask for help with:
> 
> 1) how to ignore cert errors with a fromJSON call
If you can do it with curl, then why aren't you doing one of a) a system
call, b) installing and loading RCurl, c) installing and loading curl (the R
package with that name)?
> 
> And 
> 
> 2) why the json data from the example link doesn't convert to a data
frame.
That was already answered in my earlier response. It's not a tabular result,
so it doesn't "fit" into a tabular structure.

-- 
David.

>  As seen in the following example
> 
> library("rjson")
> result <- fromJSON(file =
"https://www.semantic-mediawiki.org/w/api.php?action=ask&query=[[Category:City]]|?Capital%20of|?Has%20area&format=json")
> json_data_frame <- as.data.frame(result)
> print(json_data_frame)
> 
> which results in:
> 
>> library("rjson")
> 
> Warning message:
> package ?rjson? was built under R version 3.4.4 
> 
>> result <- fromJSON(file =
"https://www.semantic-mediawiki.org/w/api.php?action=ask&query=[[Category:City]]|?Capital%20of|?Has%20area&format=json")
>> json_data_frame <- as.data.frame(result)
> 
> Error in (function (..., row.names = NULL, check.rows = FALSE, check.names
= TRUE,  :
>  arguments imply differing number of rows: 0, 1
> 
>> print(json_data_frame)
> 
> Error in print(json_data_frame) : object 'json_data_frame' not
found
> 
>> 
> 
> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Evans,
Richard K. (GRC-H000)
> Sent: Tuesday, May 08, 2018 11:52 AM
> To: David Winsemius
> Cc: r-help at r-project.org
> Subject: Re: [R] help with json data from the web into data frame in R
> 
> Right. I'm trying to access a server within my organization which has a
cert error that I cannot fix.
> 
> The example link I provided was to a site on the web that does not have the
cert error.
> 
> From the linux shell I use the "-k" switch with cURL to ignore
cert errors.. is there an equivalent in the R world?
> 
> -Rich
> 
> 
> -----Original Message-----
> From: David Winsemius [mailto:dwinsemius at comcast.net] 
> Sent: Tuesday, May 08, 2018 11:48 AM
> To: Evans, Richard K. (GRC-H000)
> Cc: Eric Berger; r-help at r-project.org
> Subject: Re: [R] help with json data from the web into data frame in R
> 
> 
>> On May 8, 2018, at 8:36 AM, Evans, Richard K. (GRC-H000)
<richard.k.evans at nasa.gov> wrote:
>> 
>> I?ve been tinkering and discovered that the link I need to read json
data from is ?https? and there is a certificate warning that I have to click
through from a browser. That might be my issue. Is there any way in the json
package to tell it to ignore self-signed cert errors in a url?
> 
> I didn't have that issue when using the link you offered:
> 
> library(jsonlite)
> myJSON <- fromJSON(
url("https://www.semantic-mediawiki.org/w/api.php?action=ask&query=%5B%5BCategory:City%5D%5D&format=json")
)
> 
> # results in a complex list (not trivially reducible to a dataframe:
> 
> str(myJSON)
> List of 1
> $ query:List of 5
>  ..$ printrequests:'data.frame':	1 obs. of  5 variables:
>  .. ..$ label : chr ""
>  .. ..$ key   : chr ""
>  .. ..$ redi  : chr ""
>  .. ..$ typeid: chr "_wpg"
>  .. ..$ mode  : int 2
>  ..$ results      :List of 39
>  .. ..$ File:2166320938 5cfc9ec72a z.jpg                      :List of 6
>  .. .. ..$ printouts   : list()
>  .. .. ..$ fulltext    : chr "File:2166320938 5cfc9ec72a z.jpg"
>  .. .. ..$ fullurl     : chr
"https://www.semantic-mediawiki.org/wiki/File:2166320938_5cfc9ec72a_z.jpg"
> #-----trimmed-----------
> 
> David
> 
>> 
>> -Rich
>> 
>> From: Eric Berger [mailto:ericjberger at gmail.com]
>> Sent: Tuesday, May 08, 2018 11:31 AM
>> To: Evans, Richard K. (GRC-H000)
>> Cc: r-help at r-project.org
>> Subject: Re: [R] help with json data from the web into data frame in R
>> 
>> Hi Rich,
>> Take a look at the function fromJSON found in the rjson package.
>> Note that the Usage in the help page: ?fromJSON names the second 
>> argument 'file' but if you look at the description the argument
can be a URL.
>> 
>> HTH,
>> Eric
>> 
>> 
>> On Tue, May 8, 2018 at 6:16 PM, Evans, Richard K. (GRC-H000)
<richard.k.evans at nasa.gov<mailto:richard.k.evans at nasa.gov>>
wrote:
>> Hello
>> 
>> I am able to construct a url that points to some data online in the
JSON format.  See an example at [0].
>> 
>> I would like to work with this data as a dataframe in R.
>> 
>> I know that there is a package for handling json data [1] but it
assumes the data is in a local file but It is not clear to me how to request the
data from the web in an R script and get the json data converted into a data
frame in R.
>> 
>> Can anyone provide a basic example or some guidance please?
>> 
>> -Rich (revansx)
>> 
>> [0] 
>>
https://www.semantic-mediawiki.org/w/api.php?action=ask&query=[[Catego
>>
ry:City]]&format=json<https://www.semantic-mediawiki.org/w/api.php?act
>> ion=ask&query=%5b%5bCategory:City%5d%5d&format=json>
>> [1] https://www.tutorialspoint.com/r/r_json_files.htm
>> 
>> ______________________________________________
>> R-help at r-project.org<mailto:R-help at r-project.org> mailing
list -- To
>> UNSUBSCRIBE and more, see 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 at r-project.org mailing list -- To UNSUBSCRIBE and more, see 
>> 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
> Alameda, CA, USA
> 
> 'Any technology distinguishable from magic is insufficiently
advanced.'   -Gehm's Corollary to Clarke's Third Law
> 
> 
> 
> 
> 
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> 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
Alameda, CA, USA

'Any technology distinguishable from magic is insufficiently advanced.' 
-Gehm's Corollary to Clarke's Third Law

MacQueen, Don

2018-May-09 15:07 UTC

head link

[R] help with json data from the web into data frame in R

Regarding the question:
      From the linux shell I use the "-k" switch with cURL to ignore
cert errors.. is there an equivalent in the R world?
I have (sometimes) had success  by creating a .curlrc file and putting the
necessary curl options in it. When R invokes curl, curl picks up the options.
[my context was running install.packages( method='curl' ) pointing to a
local repository]

Whether the .curlrc file goes in the local working directory, or your home
directory, I'm not sure anymore. I've tried both.

-Don

--
Don MacQueen
Lawrence Livermore National Laboratory
7000 East Ave., L-627
Livermore, CA 94550
925-423-1062
Lab cell 925-724-7509
 
 

?On 5/8/18, 9:03 AM, "R-help on behalf of Evans, Richard K.
(GRC-H000)" <r-help-bounces at r-project.org on behalf of
richard.k.evans at nasa.gov> wrote:

    That said, I have two issues to ask for help with:
    
    1) how to ignore cert errors with a fromJSON call
    
    And 
    
    2) why the json data from the example link doesn't convert to a data
frame.  As seen in the following example
    
    library("rjson")
    result <- fromJSON(file =
"https://www.semantic-mediawiki.org/w/api.php?action=ask&query=[[Category:City]]|?Capital%20of|?Has%20area&format=json")
    json_data_frame <- as.data.frame(result)
    print(json_data_frame)
    
    which results in:
    
    > library("rjson")
    
    Warning message:
    package ?rjson? was built under R version 3.4.4 
    
    > result <- fromJSON(file =
"https://www.semantic-mediawiki.org/w/api.php?action=ask&query=[[Category:City]]|?Capital%20of|?Has%20area&format=json")
    > json_data_frame <- as.data.frame(result)
    
    Error in (function (..., row.names = NULL, check.rows = FALSE, check.names =
TRUE,  :
      arguments imply differing number of rows: 0, 1
    
    > print(json_data_frame)
    
    Error in print(json_data_frame) : object 'json_data_frame' not found
    
    > 
    
    -----Original Message-----
    From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Evans,
Richard K. (GRC-H000)
    Sent: Tuesday, May 08, 2018 11:52 AM
    To: David Winsemius
    Cc: r-help at r-project.org
    Subject: Re: [R] help with json data from the web into data frame in R
    
    Right. I'm trying to access a server within my organization which has a
cert error that I cannot fix.
    
    The example link I provided was to a site on the web that does not have the
cert error.
    
    From the linux shell I use the "-k" switch with cURL to ignore
cert errors.. is there an equivalent in the R world?
    
    -Rich
    
    
    -----Original Message-----
    From: David Winsemius [mailto:dwinsemius at comcast.net] 
    Sent: Tuesday, May 08, 2018 11:48 AM
    To: Evans, Richard K. (GRC-H000)
    Cc: Eric Berger; r-help at r-project.org
    Subject: Re: [R] help with json data from the web into data frame in R
    
    
    > On May 8, 2018, at 8:36 AM, Evans, Richard K. (GRC-H000)
<richard.k.evans at nasa.gov> wrote:
    > 
    > I?ve been tinkering and discovered that the link I need to read json
data from is ?https? and there is a certificate warning that I have to click
through from a browser. That might be my issue. Is there any way in the json
package to tell it to ignore self-signed cert errors in a url?
    
    I didn't have that issue when using the link you offered:
    
    library(jsonlite)
    myJSON <- fromJSON(
url("https://www.semantic-mediawiki.org/w/api.php?action=ask&query=%5B%5BCategory:City%5D%5D&format=json")
)
    
    # results in a complex list (not trivially reducible to a dataframe:
    
    str(myJSON)
    List of 1
     $ query:List of 5
      ..$ printrequests:'data.frame':	1 obs. of  5 variables:
      .. ..$ label : chr ""
      .. ..$ key   : chr ""
      .. ..$ redi  : chr ""
      .. ..$ typeid: chr "_wpg"
      .. ..$ mode  : int 2
      ..$ results      :List of 39
      .. ..$ File:2166320938 5cfc9ec72a z.jpg                      :List of 6
      .. .. ..$ printouts   : list()
      .. .. ..$ fulltext    : chr "File:2166320938 5cfc9ec72a z.jpg"
      .. .. ..$ fullurl     : chr
"https://www.semantic-mediawiki.org/wiki/File:2166320938_5cfc9ec72a_z.jpg"
    #-----trimmed-----------
    
    David
    
    > 
    > -Rich
    > 
    > From: Eric Berger [mailto:ericjberger at gmail.com]
    > Sent: Tuesday, May 08, 2018 11:31 AM
    > To: Evans, Richard K. (GRC-H000)
    > Cc: r-help at r-project.org
    > Subject: Re: [R] help with json data from the web into data frame in R
    > 
    > Hi Rich,
    > Take a look at the function fromJSON found in the rjson package.
    > Note that the Usage in the help page: ?fromJSON names the second 
    > argument 'file' but if you look at the description the argument
can be a URL.
    > 
    > HTH,
    > Eric
    > 
    > 
    > On Tue, May 8, 2018 at 6:16 PM, Evans, Richard K. (GRC-H000)
<richard.k.evans at nasa.gov<mailto:richard.k.evans at nasa.gov>>
wrote:
    > Hello
    > 
    > I am able to construct a url that points to some data online in the
JSON format.  See an example at [0].
    > 
    > I would like to work with this data as a dataframe in R.
    > 
    > I know that there is a package for handling json data [1] but it
assumes the data is in a local file but It is not clear to me how to request the
data from the web in an R script and get the json data converted into a data
frame in R.
    > 
    > Can anyone provide a basic example or some guidance please?
    > 
    > -Rich (revansx)
    > 
    > [0] 
    >
https://www.semantic-mediawiki.org/w/api.php?action=ask&query=[[Catego
    >
ry:City]]&format=json<https://www.semantic-mediawiki.org/w/api.php?act
    > ion=ask&query=%5b%5bCategory:City%5d%5d&format=json>
    > [1] https://www.tutorialspoint.com/r/r_json_files.htm
    > 
    > ______________________________________________
    > R-help at r-project.org<mailto:R-help at r-project.org> mailing
list -- To
    > UNSUBSCRIBE and more, see 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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    > 
    > ______________________________________________
    > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see 
    > 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
    Alameda, CA, USA
    
    'Any technology distinguishable from magic is insufficiently
advanced.'   -Gehm's Corollary to Clarke's Third Law
    
    
    
    
    
    ______________________________________________
    R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
    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 at r-project.org mailing list -- To UNSUBSCRIBE and more, see
    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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