I'm typing notes about linear system, but I can't draw images in it, could anyone show me how to draw them? Thank you very much![enter image description here]1

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    Welcome to TeX.SX. Questions about how to draw specific graphics that just post an image of the desired result are really not reasonable questions to ask on the site. Please post a minimal compilable document showing that you've tried to produce the image and then people will be happy to help you with any specific problems you may have. See minimal working example (MWE) for what needs to go into such a document. – Stefan Pinnow Oct 16 '16 at 17:31
  • Also, if you search for flow chart on the site here, you'll probably find a few hundred examples. – Torbjørn T. Oct 16 '16 at 17:38
  • @TorbjørnT. oh, thanks the same, I will try soon! – user165013 Oct 16 '16 at 17:40

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