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Is there a setting to display the required arguments of a function when typing as Visual Studio, Matlab, etc. does?

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    $\begingroup$ You may use the command completion ctrl-shift-K (at least until mathematica 8,I'm not sure it works on mathematica 9) $\endgroup$ – andre314 May 4 '13 at 14:24
  • $\begingroup$ @andre It works on 9.0.1, but was broken in 9.0.0. v9 also allows one to use multiple templates $\endgroup$ – rm -rf May 4 '13 at 14:37
  • $\begingroup$ Cmd-Shift-K if on the ole Macintosh. $\endgroup$ – kale May 4 '13 at 14:40
  • $\begingroup$ @andre That is useful, but is there a way to have the function arguments display? Say, once you type in the name of the function, a command that displays what arguments the function requires? $\endgroup$ – Matthew May 4 '13 at 14:56
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    $\begingroup$ @Matthew Well, that's because you haven't defined them :) See this answer, which is applicable to version 9. The method is the same for version 8, except that only 1 template is completed (the first one, IIRC) $\endgroup$ – rm -rf May 4 '13 at 16:15
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The closest thing to what you're describing are function templates, there is a tutorial on how to use them here.

You first have to write the name of the function, for example Plot, and then you hit cmd+shift+k on OS X and ctrl+shift+k on Windows, you'll get this:

arguments

Once you have typed the mandatory arguments, you can hit cmd+k on OS X or ctrl+k on Windows to get a list of any options you supply:

options

If you're having trouble making function templates work with user defined function, you should read this.

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