r - opts_current: how does it work in knitr? -

i trying set different figure size in different chunks. first define global settings using:

opts_chunk$set(fig.width=7, fig.height=7)

then, specific chunks, use:

opts_current$set(fig.width=7, fig.height=14)

but later neglected. so, how opts_current work?

for specific code chunks, put chunk options in chunk header, e.g.

```{r fig.width=7, fig.height=14}

these called local chunk options, override global chunk options (temporarily specific chunk).

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