What does ```{r, eval=F, echo=F} mean?

What is the meaning of ```{r, eval=F, echo=F}?

this is rmarkdown syntax. What you show defines the start of a code chunk.

The r means its r language (not pythong or others...)
echo - Display code in output document (default =TRUE)
eval - Run code in chunk (default = TRUE)

Useful cheat sheet is

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then what does eval=F, echo=F mean?

Eval parameter is whether to evaluate/run your chunk of code
Echo parameter is whether to print the code


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