Seamless access to python objects in R

pynR.Rmd

---
title: "Seamless Use of Python with RMarkdown and PythonInR"
author: '@kohske'
date: "Oct. 10, 2015"
output: html_document
---

PythonInR http://pythoninr.bitbucket.org/
https://cran.r-project.org/web/packages/PythonInR/README.html

Define a hook

```{r include=FALSE}
library(knitr)
library(PythonInR)

c2s = function(before, options, envir) {
  if (before) {
  } else {
    v=pyExecg(paste0(options$code, collapse="\n"), mergeNamespaces = TRUE, override = TRUE)
    for (n in names(v)) assign(n, v[[n]], envir)
  }
}
knit_hooks$set(py = c2s)
```

Write python chunk

In future python chunks will be defined by chunk option `engine = 'py'`

```{r, eval=FALSE, py=TRUE, include=FALSE}
# this is a python code
a=range(0, 3)
b=range(0, 5)
```

Access the variable

```{r}
a
b
expand.grid(a, b)
```

```{r, eval=FALSE, py=TRUE, include=FALSE}
c=a+a
```

```{r}
c
```