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Put simply: does anyone know what package is used to create the following diagrams from Stephen Boyd's book on Convex Optimization (p.24):

enter image description here

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They may have been created with some graphic program. –  egreg Apr 14 at 22:47
    
Looking at their website, they appear to use Matlab for many of the figures in the second part of the book, so one would guess they are using one of (the many) Matlab to TeX tools. You could try emailing them and asking. –  Thruston Apr 14 at 23:00
    
With TikZ/PGF it should be easy to create similar graphics. –  Rüdiger Voigt Apr 14 at 23:01
    
Inkscape, for sure, will be a good idea. –  Sigur Apr 14 at 23:30

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