Mapping world + ggplot2

Aurelie Cosandey Godin

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Mar 21, 2012, 9:37:29 AM3/21/12

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Hi all,

I'm trying to plot the world in ggplot2.

I've followed Hadley's instructions: http://had.co.nz/ggplot/examples/maps.html

library(maps)

library(ggplot2)

reg <- as.data.frame(map("world", plot = FALSE)[c("x", "y")])

qplot(x, y, data = reg, type = "path")

But I do get really thick lines...? Anyone know how I can fix this? Or have a better way to print a world map in ggplot2.

Thank you very much in advance,

Aurelie

Ben Bond-Lamberty

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Mar 21, 2012, 9:43:31 AM3/21/12

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qplot(x, y, data = reg, type = "path",size=I(.5)) # or whatever 'size' you want; see ?geom_path

Ben

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Aurelie Cosandey Godin

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Mar 21, 2012, 10:04:47 AM3/21/12

to Ben Bond-Lamberty, ggplot

Thank you Ben,

Actually just tweaking the code did the trick!

p <- ggplot(reg, aes(x, y))

p + geom_path()

Best,

Aurelie

On 2012-03-21, at 10:43 AM, Ben Bond-Lamberty wrote:

qplot(x, y, data = reg, type = "path",size=I(.5)) # or whatever 'size' you want; see ?geom_path

Ben

On Wed, Mar 21, 2012 at 9:37 AM, Aurelie Cosandey Godin <God...@dal.ca> wrote:

Hi all,

I'm trying to plot the world in ggplot2.
I've followed Hadley's instructions: http://had.co.nz/ggplot/examples/maps.html

library(maps)
library(ggplot2)
reg <- as.data.frame(map("world", plot = FALSE)[c("x", "y")])
qplot(x, y, data = reg, type = "path")

But I do get really thick lines...? Anyone know how I can fix this? Or have a better way to print a world map in ggplot2.
Thank you very much in advance,

Aurelie

<Rplot.png>

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Please provide a reproducible example: http://gist.github.com/270442

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Jean-Olivier Irisson

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Mar 21, 2012, 12:26:09 PM3/21/12

to Ben Bond-Lamberty, ggplot

On 2012-Mar-21, at 14:43 , Ben Bond-Lamberty wrote:
>
> qplot(x, y, data = reg, type = "path",size=I(.5)) # or whatever 'size' you want; see ?geom_path

No the problem comes from the syntax itself, not the size argument. The type of geom is specified with the `geom` argument, not the `type` argument. So it should be:

library(maps)
library(ggplot2)
reg <- as.data.frame(map("world", plot = FALSE)[c("x", "y")])

qplot(x, y, data = reg, geom = "path")

In the previous example you were drawing points, which looked bigger.

The last line is exactly equivalent to what you did later:

ggplot(reg, aes(x, y)) + geom_path()

Jean-Olivier Irisson
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