Rui Barradas,
Thank you very much for your help! This isn't an actual homework assignment,
it's an independent project that I'm conducting that my teacher was just giving
me a tutorial to help me. Thank you again!
Sincerely,
Jackson
Sent from my iPhone
> On Nov 19, 2016, at 3:33 PM, Rui Barradas <ruipbarra...@sapo.pt> wrote:
>
> Hello,
>
> First of all, there's a no homework policy in R-Help, but since it's the
> first time you post I'll try to give some help.
>
> Now, you are trying to call two functions in one statement, system.file and
> readPNG. If you separate the calls, you will see that the call to system.file
> is returning an empty string:
>
> system.file("img", "Seal_Island_Map.png", package="png")
> [1] ""
>
> You should then read the help page for function system.file. You do this by
> typing at an R prompt
>
> ?system.file
>
> system.file is looking in directory 'img' for a file named
> Seal_Island_Map.png but in that directory of package png there's just one
> file, RLogo.png. So you have to ask your teacher where to find that file, and
> what function does he use to display it [tip: it's not function plot()].
>
> Hope this helps,
>
> Rui Barradas
>
> Em 19-11-2016 18:32, Jackson Hooten escreveu:
>> 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. 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.
>>
>> Sincerely,
>> Jackson
>>
>> [[alternative HTML version deleted]]
>>
>> ______________________________________________
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>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
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