Re: [R] readRDS problem

2016-02-24 Thread Rolf Turner 

On 25/02/16 00:11, Erich Neuwirth wrote:

?data
will show you that data is a reserved word!


That is simply not true.  There is no mention in help for data of "data" 
being a reserved word.


Moreover, if "data" *were* a reserved word " <- " wouldn't work either.

Compare:

data <- 42 # No problema.
and
TRUE <- 42 # Throws an error; "TRUE" really *is* a reserved word.

The real explanation is more subtle; it involves "locking" and the 
rather intricate behaviour of "<<-", which I do no claim to understand.


The best advice is: DON'T USE "<<-" !!!

See fortune("dumb down").

cheers,

Rolf Turner

--
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Department of Statistics
University of Auckland
Phone: +64-9-373-7599 ext. 88276

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Re: [R] readRDS problem

2016-02-24 Thread Duncan Murdoch 

On 24/02/2016 4:26 AM, Sigbert Klinke wrote:

Hi,

I have two scripts, one creates a data structure (a list of data frames
+ some attributes) and saves it via saveRDS.

The second script reads the RDS file (outside of any function) and

data <- readRDS (name)

works, but

data <<- readRDS (name)

creates the error

Error: cannot change value of locked binding for 'data'

Any idea what goes wrong?


"data <<-" looks for an existing object named data in a parent 
environment and changes it.  But the existing object is in the utils 
namespace, and you're not allowed to change things there.


Duncan Murdoch

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Re: [R] readRDS problem

2016-02-24 Thread Michael Dewey 

You need to do
help("<-")
for a full explanation but in brief when you do <- it assigns locally 
and since it could not find data locally it makes it for you but when 
you do <<- it tries its very best to find data somewhere. Since data is 
the name of a function which the authors of R have locked it fails.


On 24/02/2016 10:02, Sigbert Klinke wrote:

Hi,

thanks, using

test <<- readRDS (name)

it worked. But why?

Best Sigbert

Am 24.02.2016 um 10:39 schrieb Michael Dewey:

Try calling it something other than data.

On 24/02/2016 09:26, Sigbert Klinke wrote:

Hi,

I have two scripts, one creates a data structure (a list of data frames
+ some attributes) and saves it via saveRDS.

The second script reads the RDS file (outside of any function) and

data <- readRDS (name)

works, but

data <<- readRDS (name)

creates the error

Error: cannot change value of locked binding for 'data'

Any idea what goes wrong?

Thanks Sigbert








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Michael
http://www.dewey.myzen.co.uk/home.html

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Re: [R] readRDS problem

2016-02-24 Thread Erich Neuwirth 
?data
will show you that data is a reserved word!


> On 24 Feb 2016, at 11:02, Sigbert Klinke  wrote:
> 
> Hi,
> 
> thanks, using
> 
> test <<- readRDS (name)
> 
> it worked. But why?
> 
> Best Sigbert
> 
> Am 24.02.2016 um 10:39 schrieb Michael Dewey:
>> Try calling it something other than data.
>> 
>> On 24/02/2016 09:26, Sigbert Klinke wrote:
>>> Hi,
>>> 
>>> I have two scripts, one creates a data structure (a list of data frames
>>> + some attributes) and saves it via saveRDS.
>>> 
>>> The second script reads the RDS file (outside of any function) and
>>> 
>>> data <- readRDS (name)
>>> 
>>> works, but
>>> 
>>> data <<- readRDS (name)
>>> 
>>> creates the error
>>> 
>>> Error: cannot change value of locked binding for 'data'
>>> 
>>> Any idea what goes wrong?
>>> 
>>> Thanks Sigbert
>>> 
>> 
> 
> 
> --
> http://u.hu-berlin.de/sk 
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> R-help@r-project.org  mailing list -- To 
> UNSUBSCRIBE and more, see
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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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Re: [R] readRDS problem

2016-02-24 Thread Sigbert Klinke 
Hi,

thanks, using

test <<- readRDS (name)

it worked. But why?

Best Sigbert

Am 24.02.2016 um 10:39 schrieb Michael Dewey:
> Try calling it something other than data.
> 
> On 24/02/2016 09:26, Sigbert Klinke wrote:
>> Hi,
>>
>> I have two scripts, one creates a data structure (a list of data frames
>> + some attributes) and saves it via saveRDS.
>>
>> The second script reads the RDS file (outside of any function) and
>>
>> data <- readRDS (name)
>>
>> works, but
>>
>> data <<- readRDS (name)
>>
>> creates the error
>>
>> Error: cannot change value of locked binding for 'data'
>>
>> Any idea what goes wrong?
>>
>> Thanks Sigbert
>>
> 


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Re: [R] readRDS problem

2016-02-24 Thread Michael Dewey 

Try calling it something other than data.

On 24/02/2016 09:26, Sigbert Klinke wrote:

Hi,

I have two scripts, one creates a data structure (a list of data frames
+ some attributes) and saves it via saveRDS.

The second script reads the RDS file (outside of any function) and

data <- readRDS (name)

works, but

data <<- readRDS (name)

creates the error

Error: cannot change value of locked binding for 'data'

Any idea what goes wrong?

Thanks Sigbert



--
Michael
http://www.dewey.myzen.co.uk/home.html

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

[R] readRDS problem

2016-02-24 Thread Sigbert Klinke 
Hi,

I have two scripts, one creates a data structure (a list of data frames
+ some attributes) and saves it via saveRDS.

The second script reads the RDS file (outside of any function) and

data <- readRDS (name)

works, but

data <<- readRDS (name)

creates the error

Error: cannot change value of locked binding for 'data'

Any idea what goes wrong?

Thanks Sigbert

-- 
http://u.hu-berlin.de/sk
__
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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and provide commented, minimal, self-contained, reproducible code.