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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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closed as too broad by Benedikt Bauer, Werner, Heiko Oberdiek, Svend Tveskæg, Adam Liter Apr 15 '14 at 1:22

There are either too many possible answers, or good answers would be too long for this format. Please add details to narrow the answer set or to isolate an issue that can be answered in a few paragraphs.If this question can be reworded to fit the rules in the help center, please edit the question.

They may have been created with some graphic program. – egreg Apr 14 '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 '14 at 23:00
With TikZ/PGF it should be easy to create similar graphics. – Rüdiger Voigt Apr 14 '14 at 23:01
Inkscape, for sure, will be a good idea. – Sigur Apr 14 '14 at 23:30

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