将绘图文本/二进制写入变量
有没有办法让 R 设备（postscript 会很棒）将输出写入变量而不是文件中？
例如，我知道这一点：
postscript(file="|cat")
plot(1:10)
dev.off()
将后记文本发送到 STDOUT。如何将该文本放入 R 中的变量中？
Is there a way to have an R Device (postscript would be great) write the output into a variable instead of a file?
For example I know this:
postscript(file="|cat")
plot(1:10)
dev.off()
Will send the postscript text to STDOUT. How can I get that text into a variable within R?
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我已经成功地将绘图的二进制作为字符串放入 R 变量中。它有一些读/写开销。在下面的代码片段中，R 将绘图保存为临时文件并将其读回。
也许这对您有帮助。
I've had success in getting the Binary of a plot into an R variable as a string. Its got some read/write overhead. In the snippet below, R saves the plot as a temp file and reads it back in.
Maybe this is helpful to you.
postscript 采用命令参数，因此 postscript(file="",command="|cat")
postscript takes a command argument, hence postscript(file="",command="|cat")
你到底为什么要这么做？ R 并不是一个很好的处理 Postscript 文件的系统。如果没有别的事，您可以使用 tempfile() 将图像写入文件，然后您可以使用标准文件函数读取该文件。如果你想要更花哨，你也许可以使用 fifo() 管道，但我怀疑它会快得多。但我怀疑你最好采用不同的方法。
Why on earth would you want to do that? R is not a very good system for manipulating Postscript files. If nothing else, you can use tempfile() to write the image to a file, which you can then read in using standard file functions. If you wanted to be fancy, you could perhaps use fifo() pipes, but I doubt it'll be much faster. But I suspect you'd be better off with a different approach.
您应该能够按如下方式使用 textConnection。
但
string仍然为空 - 也许是一个错误？You should be able to use a textConnection as follows.
But
stringremains blank - maybe a bug?