How do I iteratively generate multiple inline sentences or paragraphs in RStudio knitted Rmd?

[Tony Hirst]

Suppose I have a dataframe with a couple of columns ('name' and 'value') and I want to generate an inline sentence that reports on each row.

For example,  pseudo code might look like:

The value associated with `r df['name']` is `r df['value']`.

which is intended to suggest output:

The value associated with item1 is 25.

The value associated with item2 is 43.

...

The value associated with itemN is 12.

How would I do that?

That is, how can I iteratively declare a sentence or paragraph template that contains inline values I want to iterate over? Note the paragraph may also contain "fixed" "global" inline variables as well as ones that are iterated over.

thanks

tony

[Jeff Newmiller]

See the for loop example [1].

[1] https://github.com/yihui/knitr-examples/blob/master/020-for-loop.Rnw

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[Tony Hirst]

To partly answer my own question, this approach:

```{r results='asis'}

stints['name']=factor(stints$name)

for (name in levels(stints$name)){

  cat(paste0(knit_child('DELME_demo_sentence.Rmd',quiet=TRUE),'\n\n'))

}

```

in part cribbed from http://stackoverflow.com/a/21046060/454773 goes quite a long way towards what I needed.

The DELME..Rmd file looks like:

`r name` completed `r sum(abs(stints[stints['name']==name,]['l']))` laps over `r nrow(stints[stints['name']==name,])` stints, with a longest run of `r max(abs(stints[stints['name']==name,]['l']))` laps.

The next step is - can I knit_child over something that is included in the same file as the knit_child() element?

[Jeff Newmiller]

Use the text argument to knit_child.

--

[Tony Hirst]

Ah - ok - thanks - not found that yet...

Here's where I got to...

http://blog.ouseful.info/2015/03/29/iteratively-populating-templated-sentences-with-inline-r-in-knitrrmd/

[Stéphane Laurent]

See also http://stackoverflow.com/a/19156308/1100107