Removing LaTeX Warning: Label ... multiply defined using **knitr**

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I have a document where I define a figure label once inside fig.caption option in a chunk, and then reference it in the text using \ref{}. For instance, 

```{r dataCorrA, results="hold", echo = FALSE, fig.pos = "ht", fig.width=5, fig.height=5, fig.cap="\\label{fig:dataCorr} Some caption."}

data("airquality", package = "datasets")
GGally::ggcorr(airquality)

blah blah blah ... figure \ref{fig:dataCorr}

But upon knitting, I get

LaTeX Warning: Label `fig:dataCorr' multiply defined.

How can I get rid of the warning?

r-markdown knitr r
1 Answers

This label is incorrect. Labels are defined with two colons ::. Eg. In knitr, the label option must have two colons, not one. Change the \\labeland the \ref in text that follows. 

```{r dataCorrA, results="hold", echo = FALSE, fig.pos = "ht", fig.width=5, fig.height=5, fig.cap="\\label{fig::dataCorr} Some caption."}

data("airquality", package = "datasets")
GGally::ggcorr(airquality)

blah blah blah ... figure \ref{fig::dataCorr}

user_113139900
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