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- R Plots Not Showing Fractions
Since R runs on so many different operating systems, and supports so many different graphics formats, it's not surprising that there are a variety of ways of saving your plots, depending on what operating system you are using, what you plan to do with the graph, and whether you're connecting locally or remotely.
The first step in deciding how to save plots is to decide on the output format that you want to use. The following table lists some of the available formats, along with guidance as to when they may be useful.
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| Format | Driver | Notes |
| JPG | jpeg | Can be used anywhere, but doesn't resize |
| PNG | png | Can be used anywhere, but doesn't resize |
| WMF | win.metafile | Windows only; best choice with Word; easily resizable |
| Best choice with pdflatex; easily resizable | ||
| Postscript | postscript | Best choice with latex and Open Office; easily resizable |
A General Method
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First, here's a general method that will work on any computer with R, regardless of operating system or the way that you are connecting.
- Choose the format that you want to use. In this example, I'll save a plot as a JPG file, so I'll use the jpeg driver.
- The only argument that the device drivers need is the name of the file that you will use to save your graph. Remember that your plot will be stored relative to the current directory. You can find the current directory by typing getwd() at the R prompt.
- You may want to make adjustments to the size of the plot before saving it. Consult the help file for your selected driver to learn how.
- Now enter your plotting commands as you normally would. You will not actually see the plot - the commands are being saved to a file instead.
- When you're done with your plotting commands, enter the dev.off() command. This is very important - without it you'll get a partial plot or nothing at all.
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So if I wanted to save a jpg file called 'rplot.jpg' containing a plot of x and y, I would type the following commands: Casio horn repair parts. Slot zeist high tea.
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Another Approach
If you follow the process in the previous section, you'll first have to make a plot to the screen, then re-enter the commands to save your plot to a file. R also provides the dev.copy command, to copy the contents of the graph window to a file without having to re-enter the commands. For most plots, things will be fine, but sometimes translating what was on the screen into a different format doesn't look as nice as it should.
To use this approach, first produce your graph in the usual way. When you're happy with the way it looks, call dev.copy, passing it the driver you want to use, the file name to store it in, and any other arguments appropriate to the driver.
For example, to create a png file called myplot.png from a graph that is displayed by R, type
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Remember that when you save plots this way, the plot isn't actually written to the file until you call dev.off.
Local Sessions with Windows or OS X
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If you're actually sitting in front of a Windows or Mac computer (i.e. not using ssh to connect), the graphical user interface makes it easy to save files. Under Windows, right click inside the graph window, and choose either 'Save as metafile ..' or 'Save as postscript ..' If using Word, make sure to save as a metafile.
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On a Mac, click on the graphics window to make sure it's the active one, then go to File -> Save in the menubar, and choose a location to save the file. It will be saved as a pdf file, which you can double click to open in Preview, and then use the File -> Save As menu choice to convert to another format.
