knitr - Object not found while knitting in R Studio -


i trying knit using r studio keep getting error

error in summary(diamonds) : object 'diamonds' not found calls: ... withcallinghandlers -> withvisible -> eval -> eval -> summary execution halted

this code,

```{r}    summary(diamonds) ```

while run above code works fine when try knit says object not found. although when use cars datset, don't have such problems. understand diamonds dataset part of ggplot2 package , have installed package well.

i have gone through suggestions use 

knit2html('filename.rmd') knit('filename.rmd')

i have tried 

```{r include = true}    summary(diamonds) ```

you need load package inside code chunk before knitting it. 

```{r}     library(ggplot2)    summary(diamonds)  ```

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