Re: using scale_linetype_manual

[Brandon Hurr]

Can you provide more context or a working example? I left my ggplot2 book at work. 

On Fri, Oct 26, 2012 at 6:12 PM, stan <sa...@cdc.gov> wrote:

When use the example on p. 108 of the Wickam "ggplot2" text,  and inlcude the follwoing line:

 plot  + aes(linetype=vore) + scale_linetype_manual(value=c(0,1,2,3,4))

 

the output plots no lines.

I must be using the manual function incorrectly.

 

Any suggestions?

 

  

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[Brandon Hurr]

I mean, can you provide what "plot" is? I can't replicate it without the book unless you tell me what the data is. 

I'm guessing that in plot they are using geom_point(), but there might not be a geom_line().  

B

On Fri, Oct 26, 2012 at 7:59 PM, Shulman, Stanley A. (CDC/NIOSH/DART) <sa...@cdc.gov> wrote:

Thanks for the reply.

I must be doing something wrong.

 

When I enter the following :

 

plot  + aes(shape=vore) + scale_shape_manual(value=c(1,2,6,0,23))

 

the data are plotted with five different symbols, one for each of five groups.

 

When the change is made from shapes to linetypes,

 

plot  + aes(linetype=vore) + scale_linetype_manual(value=c(0,1,2,3,4))

 

no lines appear.  The values 0,1,2,3,4 are allowed identifiers for different kinds of lines. I am confused.

 

That is my problem.  Any thoughts?

[Brandon Hurr]

Yeah... this looks really broken Stanley. I'm guessing bug. 

#redoing this in ggplot() format...

ggplot(data=msleep, aes(x=brainwt, y=bodywt, linetype=factor(vore)), group=vore)+ geom_line()

Error in grid.Call.graphics(L_lines, x$x, x$y, index, x$arrow) : 

  invalid hex digit in 'color' or 'lty'

It actually did plot something and I can see the lines when I change the quartz() window size, but the axes, axes titles, and other parts are all missing. geom_point() does work in the same format.

> levels(msleep$vore)

[1] "carni"   "herbi"   "insecti" "omni"   

Not sure what to tell you... I don't have an answer. 

On Fri, Oct 26, 2012 at 8:29 PM, Shulman, Stanley A. (CDC/NIOSH/DART) <sa...@cdc.gov> wrote:

plot <- qplot(brainwt, bodywt, data=msleep, log=”xy”)

 

does this help?

[Winston Chang]

I think it has to do with the NAs in the vore column. This works:

ms <- msleep[ !is.na(msleep$vore), ]

ggplot(data=ms, aes(x=brainwt, y=bodywt, linetype=factor(vore)), group=vore)+ geom_line()

But it is a bug. Could you file an issue on github?

-Winston

[Brian Diggs]

On 10/26/2012 10:12 AM, stan wrote:
> When use the example on p. 108 of the Wickam "ggplot2" text,

To make this reproducible for those that don't have the book at
hand/memorized:

plot <- qplot(brainwt, bodywt, data=msleep, log="xy")

> and inlcude the follwoing line:
> plot + aes(linetype=vore) + scale_linetype_manual(value=c(0,1,2,3,4))
>
> the output plots no lines.

I get an error:

Error in structure(list(call = match.call(), aesthetics = aesthetics, :
argument "values" is missing, with no default

The argument should be `values`, not `value`

Making that change:

plot + aes(linetype=vore) + scale_linetype_manual(values=c(0,1,2,3,4))

does not have lines. But that has nothing to do with the manual
linetype. The issue is that qplot makes points by default. Points have
shape and colour, but not a linetype. You need to draw lines before you
see the effect of a linetype.

plot + geom_line() + aes(linetype=vore) +
scale_linetype_manual(values=c(1,2,3,4), na.value=0)

> I must be using the manual function incorrectly.
>
> Any suggestions?

--

Brian S. Diggs, PhD
Senior Research Associate, Department of Surgery
Oregon Health & Science University

[Shulman, Stanley A. (CDC/NIOSH/DART)]

It happens that I need to put both symbols and lines on the plot, and I need to be able to choose the lines and symbols that are assigned.  I seem to need to use scale_shape_manual and  scale_linetype_manual to correctly set the desired symbols and  lines, but the following code does not work with regard to the lines.  Any suggestions?

##the following code seems to remove all nas for all variables used, I think.   

ms <- msleep[ !is.na(msleep$vore) & !is.na(msleep$brainwt)  & !is.na(msleep$bodywt),]

q1 <-  qplot(brainwt,bodywt,data=ms)

q2 <- q1 + aes(shape=vore) + scale_shape_manual(value=c(1,2,6,0))

q3 <- q1 + aes(linetype=vore) + scale_linetype_manual(value=c(0,1,2,3))

q4 <- q2 + aes(linetype=vore) + scale_linetype_manual(value=c(0,1,2,3))

 

Also, how do I iissue an github?

Thanks

[Winston Chang]

No worries, I just filed it:

https://github.com/hadley/ggplot2/issues/711

-Winston