[R] purrr::map and xml2:: read_xml

[Ulrik Stervbo]

Hi Maicel,

I'm guessing that B works on 50 files, and that A fails because there is no
function called 'read_xmlmap'. If the function that you map work well,
removing 'dplyr::sample_n(50)' from 'B' should solve the problem.

If that is not the case, we need a bit more information.

HTH
Ulrik

On Fri, 6 Jan 2017 at 17:08 <maicel at infomed.sld.cu> wrote:

> Hi List, I am trying to extract the key words from 1403 papers in xml
> format. I programmed such codes but they do not work but they only do
> with the modification showed below. But that variation is not the one
> I need because the 1403 xml files do not match to those in my folder.
> Could you please tell me where are the mistakes in the codes list (A
> or B) to help me to correct them? The data frame columns are an id and
> the paths.
>
> A-Does not work, but it is the one I need.
>
> keyword <-
>    muestra %>%
>    select(path) %>%
>    read_xmlmap(.f = function(x) { read_xml(x) %>%
>         xml_find_all( ".//kwd") %>%
>         xml_text(trim=T) })
>
> B-It works but only with a small number of papers.
>
> keyword <-
>    muestra %>%
>    select(path) %>%
>     dplyr::sample_n(50) %>%
>     unlist() %>%
>    map(.f = function(x) { read_xml(x) %>%
>         xml_find_all( ".//kwd") %>%
>         xml_text(trim=T) })
>
> Thank you,
> Maicel Monzon MD, PHD
>
>
> ----------------------------------------------------------------
>
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