[R] ggplot2: less than equal sign

[soon yi]

Thank you both for the suggestions.

That worked great djmuse.


djmuseR wrote
> Hi:
> 
> Here's a way you could do it entirely within ggplot2. The annotation
> functions have a parse = argument which allows you to pass character
> string representations of math expressions, but there is no such thing
> in the scale functions, so you need a different approach.
> 
> library(ggplot2)
> df <- data.frame(vis=c(0,0,1,1) , count=c(10,15,20,10) , grp=c(0,1,0,1))
> 
> # Generate a list of expressions that will become the legend labels
> lbs <- list(expression(x <= 10), expression(x > 10))
> 
> ggplot(df, aes(x = factor(vis), y=count , fill=factor(grp)))  +
>    geom_bar(stat ="identity") +
>    scale_fill_manual(breaks = levels(factor(df$grp)),
>                      values = c("blue", "orange"),
>                      labels = lbs)
> 
> The specifications in scale_fill_manual() are:
>     - breaks: the values to go on the horizontal axis
>     - values: the vector of fill colors for each level of grp
>     - labels: the legend labels
> Notice that the labels = takes a list of expressions as its argument.
> This approach gives you more control over the legend and choice of
> fill colors at the expense of a couple of lines of code. To change the
> axis and legend titles, one can use the labs() function; e.g.,
> 
> last_plot() + labs(x = "Visibility", y = "Frequency", fill = "Threshold")
> 
> Dennis
> 
> On Thu, Mar 28, 2013 at 2:22 PM, soon yi <

> soon.yi@

> > wrote:
>> Hi
>>
>> I am trying to add a less than equal sign to a plot. I have previously
>> done
>> this using unicode but is not working in this instance. Any suggestions
>> would be great
>>
>> thanks
>>
>> example code:
>>
>> library(ggplot2)
>> df<-data.frame(vis=c(0,0,1,1) , count=c(10,15,20,10) , grp=c(0,1,0,1))
>> df$grp <-factor(df$grp ,levels=c(0,1) , labels =c("x \u2265 10" , "x >
>> 10"))
>> ggplot(df, aes(x = factor(vis), y=count , fill=grp))  + geom_bar(stat =
>> "identity")
>>
>>
>>
>>
>> --
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>>
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> 
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