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I googled and found how to do it in LaTeX software on your computer, but what about this website, possible to draw graphs as easy as writing out a matrix in LaTeX?

Failing that is there some website that will generate an image for you given the graph spec.

Thanks.

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Well, there are many ways to create a picture, and upload it here. Some of the more obvious alternatives are:

(1) MS Paint, GIMP, or other paint programs

(2) Illustrator, Corel, Powerpoint, Inkscape, or other vector drawing packages

(3) TikZ or MetaPost or Asymptote, if you think that writing code is a good way to create pictures.

(4) Mathematica, Maple, Matlab, or any other package with graphing capabilities

(5) Draw on paper, and scan

(6) Draw on a whiteboard (or even a blackboard), and shoot with a camera or mobile phone.

Options 5 and 6 give you a bitmap image directly. The other options will require you to generate one indirectly. A screen grab is usually the easiest way.

For graphs, I would recommend #2 or #5, personally.

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    $\begingroup$ Please, don't use a point-and shoot camera or phone camera unless you're photographing something three-dimensional. $\endgroup$ – dfeuer Oct 24 '13 at 2:43
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    $\begingroup$ @defeuer -- why is that? $\endgroup$ – bubba Mar 14 '14 at 4:04
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    $\begingroup$ Because it produces images that tend to be even harder to read than proper scans of the same hand-scribbled notes. $\endgroup$ – dfeuer Mar 14 '14 at 19:16
  • $\begingroup$ I personally like the draw on paper and scan the most and this will become more and more accessible until that's all we use. $\endgroup$ – I'm an alien Im an eagle alien Dec 1 '14 at 16:20
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    $\begingroup$ You forgot to mention PSTricks. $\endgroup$ – Who Save Me Save Entire World Aug 27 '19 at 9:05
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If you know Mathematica syntax you can use Wolfram Alpha for simple graphs. Then post the image here:

graphs

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Graphviz can draw graphs, and google charts API can do graphviz. See erdos for a tool that lets you use the API interactively.

Alternatively, you can use tikz, and a site like writelatex.com to render it.

When using either of these, I use imgur.com's browser plugin to rehost the image, and I use gist to save the source; I make sure to link the sources from my diagrams in my questions and answers.

Typically, I use <sup><\sup> to "caption" the images from underneath.

Another trick: when displaying multiple images, you can resize them to fit on the same row side-by-side; IIRC the width of the display is ~660 pixels (on at least on cs.SE; I hope it doesn't change!) - image hosting sites like imgur.com directly support simple image editing, like scaling and cropping - then I caption them underneath like "left: description, right: description".

Example:

Image of graph Image of shortest path Image of non intersecting shortest path

Left: Full graph. Center: shortest path. Right: shortest non-intersecting path.

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    $\begingroup$ Oh, please don't rely on a certain number of pixels in the display! $\endgroup$ – dfeuer Oct 24 '13 at 2:40
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    $\begingroup$ You can put images side-by-side in $\LaTeX$ using \minipage $\endgroup$ – user1729 Oct 26 '13 at 13:41
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    $\begingroup$ @dfeuer you can combine the images if need be lol. Or like user1729 suggested, you can combine them in LaTeX. $\endgroup$ – Realz Slaw Oct 28 '13 at 18:05
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    $\begingroup$ @RealzSlaw: "This image you are requesting does not exist or no longer available". $\endgroup$ – hrkrshnn Aug 30 '14 at 9:27
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    $\begingroup$ @Moron true, but it doesn't really matter what the image is, the point is the captions. If it bothers you, you can edit in any image . $\endgroup$ – Realz Slaw Aug 31 '14 at 0:44
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    $\begingroup$ the images no longer exist, can you lease edit that$ $\endgroup$ – user153330 Sep 18 '15 at 21:14
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    $\begingroup$ @user153330 done $\endgroup$ – Realz Slaw Sep 18 '15 at 21:32
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There is now:

Quiver - a Commutative Diagram Editor

  1. Exports to TikzCD format.
  2. Exports a URL of diagram data which you can then post here. The URL data gets loaded by the end link viewer's browser.

Developed by coder varkor.

Soon, there will be a database backend to Quiver called Quiver Database (but an independent project):

Quiver Database GitHub Repository

  1. See videos linked to at the bottom of that page for a demonstration.
  2. If you can run Django code and install Python libraries, you can also follow the instructions to set up a local site for dev purposes on your machine, but the code is still very not-ready for release. I just wanted to share it and inform you that it is coming to a computer or phone near you.

Developed by me.

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