Linux readChar中出错（con，5L，useBytes=TRUE）：无法打开连接

“mow.R”现在包含：

library(RgoogleMaps);
png(filename="RgoogleMaps-package_%03d_med.png", width=480, height=480);

MyMap <- GetMap(markers='&40.702147,-74.015794,blues%7C40.711614,-74.012318,greeng%7C40.718217,-73.998284,redc', destfile="MyTile1.png");

纠正这个错误的方法是什么

R版本2.15.1 RgoogleMaps版本1.2.0

---

解决了。以下是工作代码：

library(RgoogleMaps);
png(filename="Rg.png", width=480, height=480);


lat    = c(40.702147,40.718217,40.711614);
lon    = c(-74.012318,-74.015794,-73.998284);
center = c(mean(lat), mean(lon));
zoom <- min(MaxZoom(range(lat), range(lon)));

MyMap <- GetMap(center=center, zoom=zoom, markers='&40.702147,-74.015794,blues%7C40.711614,-74.012318,greeng%7C40.718217,-73.998284,redc', destfile="My.png");

tmp <- PlotOnStaticMap(MyMap,lat=c(40.702147,40.711614,40.718217),lon=c(-74.015794,-74.012318,-73.998284),cex=1.5,pch=20,col=c('red', 'blue', 'green'),add=F);

dev.off();

---

我也会在R的邮件列表上交叉发布这个。我放弃了，建议阅读和@mdsumner抱歉，我仍然没有得到除了我将很快添加的版本之外，我还需要在这里添加什么。如果你运行上面的文件，你会注意到我正在处理的错误。从这里复制了这个示例：@mdsumner他们在这里还使用了一个png文件名：RgoogleMaps-package_%03d_med.png我不知道这代表什么。+1，另外，你能指定问题是什么并描述解决方案吗？现在我们需要自己比较代码，你的解释会让答案更清楚。@PaulHiemstra我当然理解，但问题是我对R不太熟悉，无法自己解释这个问题。真的很抱歉。也许一些R专家可以比较一下代码，并告诉我们是什么让这段代码起作用的：

> sessionInfo() 
R version 2.15.1 (2012-06-22)
Platform: x86_64-unknown-linux-gnu (64-bit)

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8    
 [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8   
 [7] LC_PAPER=C                 LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] RgoogleMaps_1.2.0 png_0.1-4        
> 

library(RgoogleMaps);
png(filename="Rg.png", width=480, height=480);


lat    = c(40.702147,40.718217,40.711614);
lon    = c(-74.012318,-74.015794,-73.998284);
center = c(mean(lat), mean(lon));
zoom <- min(MaxZoom(range(lat), range(lon)));

MyMap <- GetMap(center=center, zoom=zoom, markers='&40.702147,-74.015794,blues%7C40.711614,-74.012318,greeng%7C40.718217,-73.998284,redc', destfile="My.png");

tmp <- PlotOnStaticMap(MyMap,lat=c(40.702147,40.711614,40.718217),lon=c(-74.015794,-74.012318,-73.998284),cex=1.5,pch=20,col=c('red', 'blue', 'green'),add=F);

dev.off();

dd@linux-y3pi:~/RTest> ls
new.R

dd@linux-y3pi:~/RTest> R

R version 2.15.1 (2012-06-22) -- "Roasted Marshmallows"
Copyright (C) 2012 The R Foundation for Statistical Computing
ISBN 3-900051-07-0
Platform: x86_64-unknown-linux-gnu (64-bit)

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

  Natural language support but running in an English locale

R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

[Previously saved workspace restored]

> source('new.R')
Loading required package: png
[1] "&40.702147,-74.015794,blues%7C40.711614,-74.012318,greeng%7C40.718217,-73.998284,redc"
[1] "http://maps.google.com/maps/api/staticmap?center=40.7106593333333,-74.0087986666667&zoom=15&size=640x640&maptype=terrain&format=png32&sensor=true&40.702147,-74.015794,blues%7C40.711614,-74.012318,greeng%7C40.718217,-73.998284,redc"
> q()
Save workspace image? [y/n/c]: y

dd@linux-y3pi:~/RTest> ls
My.png  My.png.rda  new.R  Rg.png

dd@linux-y3pi:~/RTest>