Rmd programmatic links

RmdLinks.Rmd

```{r showLink, results='asis'}
var1 <- "672"
var2 <- "12189"
srchVar <- paste(var1, var2, collapse=",", sep=",")
tmp1 <- paste('<a href="http://www.ncbi.nlm.nih.gov/gene?term=', srchVar, '">Results</a>', sep="")
cat(tmp1)
```

You can make it more compact and readable:

```{r}
var1 <- "672"
var2 <- "12189"
```

[Results](http://www.ncbi.nlm.nih.gov/gene?term=`r I(c(var1, var2))`)

It is simple just because the coincidence that the knitr inline hook function uses paste(..., collapse = ', ') which happens to be valid for the URL for your case.