On 19/11/2016 1:32 PM, Jackson Hooten wrote:
Hello R Help,
I am fairly new to R and have been scouring the internet trying to find
useful tips, tricks and advice with how to solve my problems with R. I
finally was able to find you guys, and am now asking for your help.
You can find a fairly recently edited discussion of how to get help at
https://www.r-project.org/help.html
I have
a number of different questions regarding R. My most pressing question is,
how does one get a map of a very specific area into R? I've been following
a tutorial that one of my teachers sent me and been following his code.
However, every time I input this code I get a warning message:
My teacher's code:
plot(map, col="dimgray", border=F, add=T)
The Error code I get every time I input the above code:
Error in plot.window(...) : need finite 'ylim' values
In addition: Warning messages:
1: In xy.coords(x, y, xlabel, ylabel, log) : NAs introduced by coercion
2: In min(x) : no non-missing arguments to min; returning Inf
3: In max(x) : no non-missing arguments to max; returning -Inf
4: In plot.window(...) : "border" is not a graphical parameter
5: In plot.window(...) : "add" is not a graphical parameter
So, what I think I figured out was that I didn't possess the "map" that my
teacher had in his R program. So I went to try and figure out how to get my
own map into my R session. I found this line of code to try and input a
good Google Earth map I found that I need for my study. But, alas, this
code didn't work either and I got more Error codes.
The code I used:
img <-readPNG(system.file("img", "Seal_Island_Map.png", package="png"))
The Error code I get every time I input the above code:
Error in readPNG(system.file("img", "Seal_Island_Map.png",
package="png")) : unable to open
For the life of me, I have not been able to find anything anywhere that can
help me solve these problems. What am I doing wrong? Can you all help?
Thank you and I hope to talk to you all soon.
You need to tell R where the "Seal_Island_Map.png" file is sitting. The
"system.file(...)" call you used says it's a file in the "png" package,
but it's not. The easiest way to find a file is to use the
file.choose() function to open a file selection dialog, e.g.
filename <- file.choose()
readPNG(filename)
Duncan Murdoch
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