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Re: [O] Strings converted to numbers in Org table?


From: Charles C. Berry
Subject: Re: [O] Strings converted to numbers in Org table?
Date: Mon, 27 Feb 2017 10:17:03 -0800
User-agent: Alpine 2.20 (OSX 67 2015-01-07)

On Mon, 27 Feb 2017, Vicente Vera wrote:

Hello again, I'm sorry for being noisy.

OK yes, `org-babel-read' is indeed converting "number strings" to
numbers.


[proposed fix deleted]

I don't have a feeling as to whether the proposed fix is appropriate.

However, there are other ways to solve this issue. See below.


- In R every value is a string. "var2" contains no numbers (is a
  character vector).

- Upon conversion to a table Org removes the zero from "var2" last
  value.

------------------------------

#+BEGIN_SRC R :session *mwe* :results value table :colnames yes
  tst <- data.frame(var1 = c("a", "b", "c", "d", "e", "f", "g"),
                    var2 = c("150", "210", "140", "150", "192", "497",
"3.350"),
                    stringsAsFactors = FALSE)
  tst
#+END_SRC

#+RESULTS:
| var1 | var2 |
|------+------|
| a    |  150 |
| b    |  210 |
| c    |  140 |
| d    |  150 |
| e    |  192 |
| f    |  497 |
| g    | 3.35 |

------------------------------

Here's the output as seen in R:

: > tst
:   var1  var2
: 1    a   150
: 2    b   210
: 3    c   140
: 4    d   150
: 5    e   192
: 6    f   497
: 7    g 3.350

Details on the data frame:

: > str(tst)
: 'data.frame':    7 obs. of  2 variables:
:  $ var1: chr  "a" "b" "c" "d" ...
:  $ var2: chr  "150" "210" "140" "150" ...

It seems Org knows that the values on column "var2" are numbers and
converts the strings to numbers, applying some obscure trimming on the
digits. The "3.350" value needs to be left as is.


IMHO, it is often best to handle formatting of output in the language of the src block. There are some tools for doing this in R: the `ascii' package is one. `xtable' is another.

You can always do something like this:

#+BEGIN_SRC R :session *mwe* :results output
 tst <- data.frame(var1 = c("a", "b", "c", "d", "e", "f", "g"),
 var2 = c("150", "210", "140", "150", "192", "497", "3.350"),
 stringsAsFactors = FALSE)

 cat( capture.output( print(tst, row.names=FALSE)), sep="\n")

#+END_SRC


Or you can use `ox-ravel'[1] to convert to one of the knitr-like formats and let knitr or rmarkdown handle the output conversion.

Best,

Chuck

[1] https://github.com/chasberry/orgmode-accessories




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