ggplot2 qplot pch not working anymore

Is there a way to use a continuous variable to pch in qplot?  I 
believe this worked in previous version.  I need to specify certain 
values of a shape for particular points so that multiple graphs all 
show the same shapes for the same streams.  I have gone to the 
original data and added a pch column that I would like to use to 
specify the shapes to pch in qplot.  Any help would be greatly 
appreciated.

#example code
a <- 1:10
b <- 1:10
pch <- 1:10

q <- data.frame(a,b,pch)

qplot(a,b, pch=pch)

Many thanks,

I'm sorry I didn't give the correct code, or explaination;  the 
shape=pch doesn't work anymore.  For example this used to work, but no 
longer can accept continuous values:

#example code
a <- 1:10
b <- 1:10
pch <- 1:10

q <- data.frame(a,b,pch)

qplot(a,b, shape=pch)

many thanks,

Stephen Sefick

On 07/17/2012 07:28 PM, Stephen Sefick wrote:

Is there a way to use a continuous variable to pch in qplot?  I 
believe this worked in previous version.  I need to specify certain 
values of a shape for particular points so that multiple graphs all 
show the same shapes for the same streams.  I have gone to the 
original data and added a pch column that I would like to use to 
specify the shapes to pch in qplot.  Any help would be greatly 
appreciated.

#example code
a <- 1:10
b <- 1:10
pch <- 1:10

q <- data.frame(a,b,pch)

qplot(a,b, pch=pch)

Many thanks,

Stephen Sefick <sas0025 <at> auburn.edu> writes:

I'm sorry I didn't give the correct code, or explaination;  the
shape=pch doesn't work anymore.  For example this used to work, but no
longer can accept continuous values:

#example code
a <- 1:10
b <- 1:10
pch <- 1:10

q <- data.frame(a,b,pch)

qplot(a,b, shape=pch)

   Not entirely clear what you want it to do: how *would* you
map a continuous variable onto shape (assuming you're not
using something like Chernoff faces)?  Does

qplot(a,b,shape=factor(pch,levels=1:10))

do what you want?

A couple of possibly useful recent Stack Overflow posts
(URLs broken):

http://stackoverflow.com/questions/10002627/
ggplot2-0-9-0-automatically-dropping-unused-factor-levels-from-plot-legend

http://stackoverflow.com/questions/11361404/
consistent-legend-colors-with-qplot

many thanks,

Stephen Sefick

On 07/17/2012 07:28 PM, Stephen Sefick wrote:

Is there a way to use a continuous variable to pch in qplot?  I
believe this worked in previous version.  I need to specify certain
values of a shape for particular points so that multiple graphs all
show the same shapes for the same streams.  I have gone to the
original data and added a pch column that I would like to use to
specify the shapes to pch in qplot.  Any help would be greatly
appreciated.

#example code
a <- 1:10
b <- 1:10
pch <- 1:10

q <- data.frame(a,b,pch)

qplot(a,b, pch=pch)

Many thanks,