Matlab Coder Error: Cannot Process Options

I am getting a cyptic error when compiling very simple test code. I am running Matlab on a mac.

>> coder -args { 0 } HW -report  
Cannot process options.

function ans = HW(x)

ans = x*2;

end

Running mex -setup returns

>> mex -setup

      Options files control which compiler to use, the compiler and link command
      options, and the runtime libraries to link against.

      Using the 'mex -setup' command selects an options file that is
      placed in /Users/Joseph/.matlab/R2012a and used by default for 'mex'. An options 
      file in the current working directory or specified on the command line 
      overrides the default options file in /Users/Joseph/.matlab/R2012a.

      To override the default options file, use the 'mex -f' command
      (see 'mex -help' for more information).

The options files available for mex are:

    1: /Applications/MATLAB_R2012a.app/bin/mexopts.sh : 
        Template Options file for building gcc MEX-files

    0: Exit with no changes

Enter the number of the compiler (0-1):

Answer 1

[Kaustubha Govind]

You need to run the "codegen" command, not the "coder" command:

     >> codegen -args {0} HW -report

[Joseph Cullen]

oh wow...that was a stupid mistake. Thanks!

Answer 2

[Walter Roberson]

-args has to go after the function it applies to.

coder HW -args {0} -report

[Joseph Cullen]

It makes no difference whether or not the -args is before or after the function. Any other ideas?

>> coder HW -args { 0 } -report

Cannot process options.

[Walter Roberson]

I would be curious as to whether the problem disappears if you have no spaces in the args, {0} instead of { 0 } ?