R help - Jun 2021 - Read fst files

On 09/06/2021 9:12 a.m., Jeff Reichman wrote:
> Duncan
> 
> Yea that will work. It appears to be related to setting my working dir, for
what ever reason neither seem to work
> (1) knitr::opts_knit$set(root.dir
="~/My_Reference_Library/Regression") # from R Notebook or
> (2)
setwd("C:/Users/reichmaj/Documents/My_Reference_Library/Regression") #
from R chunk
> 
> So it appears I can either (as you suggested) use two steps or combine but
I need to enter the full path. Why other file types don't seem to need the
full path ....?????
You need to read the documentation for read_fst() to find what it needs. 
  If it doesn't explain this, then you should report the issue to its 
author.
> 
> myObject <-
read_fst(unz("C:/Users/reichmaj/Documents/My_Reference_Library/Regression/Datasest.zip",
filename = "myFile.fst"))
> 
> Thank you. I guess just one of those R things
No, it's a read_fst() thing.

Duncan Murdoch

read_fst is from the package fst. The fileformat fst uses is a binary 
format designed to be fast readable. It is a column  oriented format and 
compressed. So, to be able to work fst needs access to the file itself 
and wont accept a file connection as functions like read.table an 
variants accept.

Also, because it is a binary compressed format using a compression 
method that is fast to read, compressing also to zip seems to defeat the 
purpose of fst.

HTH,
Jan


On 09-06-2021 15:28, Duncan Murdoch wrote:
> On 09/06/2021 9:12 a.m., Jeff Reichman wrote:
>> Duncan
>>
>> Yea that will work. It appears to be related to setting my working 
>> dir, for what ever reason neither seem to work
>> (1) knitr::opts_knit$set(root.dir 
>> ="~/My_Reference_Library/Regression") # from R Notebook or
>> (2) 
>>
setwd("C:/Users/reichmaj/Documents/My_Reference_Library/Regression") #
>> from R chunk
>>
>> So it appears I can either (as you suggested) use two steps or combine 
>> but I need to enter the full path. Why other file types don't seem
to
>> need the full path ....?????
> 
> You need to read the documentation for read_fst() to find what it needs. 
>  ?If it doesn't explain this, then you should report the issue to its 
> author.
> 
>>
>> myObject <- 
>>
read_fst(unz("C:/Users/reichmaj/Documents/My_Reference_Library/Regression/Datasest.zip",
>> filename = "myFile.fst"))
>>
>> Thank you. I guess just one of those R things
> 
> No, it's a read_fst() thing.
> 
> Duncan Murdoch
> 
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