Adding a line break to code blocks in R Markdown -

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i using knitr package r markdown create html report. having trouble keeping code on separate lines when using '+'.

for example,

```{r} ggplot2(mydata, aes(x, y)) +    geom_point() ```

will return following the html document

ggplot2(mydata, aes(x, y)) + geom_point()

normally fine, problem arises once start adding additional lines, want keep separate make code easier follow. running following:

```{r} ggplot2(mydata, aes(x, y)) +    geom_point() +    geom_line() +    opts(panel.background = theme_rect(fill = "lightsteelblue2"),         panel.border = theme_rect(col = "grey"),         panel.grid.major = theme_line(col = "grey90"),         axis.ticks = theme_blank(),         axis.text.x  = theme_text (size = 14, vjust = 0),         axis.text.y  = theme_text (size = 14, hjust = 1.3)) ```

will result in code coming out in 1 line, making harder follow:

ggplot2(mydata, aes(x, y)) + geom_point() + geom_line() + opts(panel.background = theme_rect(fill = "lightsteelblue2"), panel.border = theme_rect(col = "grey"), panel.grid.major = theme_line(col = "grey90"), axis.ticks = theme_blank(), axis.text.x  = theme_text (size = 14, vjust = 0), axis.text.y  = theme_text (size = 14, hjust = 1.3))

any in solving appreciated!

try chunk option tidy = false:

```{r tidy=false} ggplot2(mydata, aes(x, y)) +   geom_point() +   geom_line() +   opts(panel.background = theme_rect(fill = "lightsteelblue2"),        panel.border = theme_rect(col = "grey"),        panel.grid.major = theme_line(col = "grey90"),        axis.ticks = theme_blank(),        axis.text.x  = theme_text (size = 14, vjust = 0),        axis.text.y  = theme_text (size = 14, hjust = 1.3)) ```

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