Install Octave on Mac

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octave3.8.0 gnuplot> set terminal aqua enhanced title "Figure 1" size 560 420  font "*,6" dashlength 1
                      ^
         line 0: unknown or ambiguous terminal type; type just 'set terminal' for a list

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$ sw_vers
ProductName:	macOS
ProductVersion:	12.0
BuildVersion:	21A344
tmbp:~ tato$ 

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brew update
brew upgrade
brew doctor
brew install octave

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brew install octave

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setenv('GNUTERM', 'qt')
graphics_toolkit("gnuplot")

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$ octave
octave:1> x=-2*pi:0.1:2*pi;
octave:2> y=sin(x);
octave:3> plot(x, y);