I'm on Windows 10 64-bit, with MiKTeX and TeXstudio. I want to draw signal flow graphs in LaTeX, so I have "installed" the sfg package, along with pstricks and fp (the prerequisites). Unfortunately, when I try to execute a minimal file, I get an undefined control sequence error message. Here's the minimal file:



\begin{picture}(27,4) % % branches related to node 2 

The command that LaTeX doesn't like is the first uncommented sfgbranch command in the picture environment.

Any ideas?

  • Any update? Does your problem still exist? – Dr. Manuel Kuehner Jan 11 '16 at 17:59
  • Sorry. Many thanks for your answer. I haven't had time to go through your suggestions yet. I'll definitely let you know when I've done so. – Adrian Keister Jan 11 '16 at 23:13

First make sure that you installed the package correctly - here's a tutorial (I made it for another purpose): https://www.youtube.com/watch?v=OD15rZO_rD8


This is only a partial answer: I couldn't figure it out how to use pdflatex.

First Guess

You are probably using pdflatex in order to compile. This doesn't work out of the box. After reading this question I tried xelatex for example and get the following output:

enter image description here


But maybe you want to use a more up to date solution - have a look at the some of the tikz (which is another package - it works with pdflatex without problems) examples here: http://www.texample.net/tikz/examples/tag/block-diagrams/

  • I can get the signalflowdiagram stuff to work in the tikz example page. That looks like a very workable solution. The xelatex command I'm very unfamiliar with. It didn't seem to produce any output! Thanks much. – Adrian Keister Jan 12 '16 at 21:41

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