I used the cmtip option in xypic, but this doesn't change the tips of the \xtwocells, and I have a lot of 2-cells. I am using cmtip because I want the tips in the diagrams to match the ones of the in-line arrows $A\to B$. It seems that the cmtip option is not compatible with the 2cell option. So how to change the tips of the 2-cells?

If this leads to also put any symbol (which can be oriented properly) in the place of the 2-cell. I would also like to know about that.

Here is a simple example. A square with a cell inside.


lax square





tl\ar[r]^t \ar[d]_l &tr\ar[d]^r\ar@{=>}[ld]^2\\
bl\ar[r]_b &br

  • Avoid using $$ in LaTeX, \[....\] is better. – CarLaTeX Feb 7 '17 at 7:09
  • 1
    See Why is \[\] preferable to $$? – Werner Feb 7 '17 at 7:24
  • Thanks for your answer, but unfortunately if I compile it as you wrote, it doesn't change the tip of the 2-cell. From your code I was not expecting this behaviour. Also, the 2cell is way too long, I prefer the shorter one as in the example I gave. – MetalMathician Feb 7 '17 at 9:35

Is a solution with tikz-cd Ok for you?


        tl\ar{r}{t} \ar{d}[swap]{l} &tr \arrow[Rightarrow]{ld}{2}\arrow{d}{r} \\
        bl\ar{r}[swap]{b} &br

enter image description here

  • Not really, I have a long document with many many diagrams that include 2cells, some of them quite complicated. But thanks. – MetalMathician Jan 22 '17 at 11:16
  • @RamónAbudAlcalá Sorry, I can't help you with xymatrix. Perhaps if you add to your question one of your complex diagram someone else can understand better your problem and solve it. – CarLaTeX Jan 22 '17 at 11:45
  • well the question is not about any particular diagram, is about the possibility to change the tips of the 2-cells of xy-pic. So that my document has a uniform look. – MetalMathician Jan 22 '17 at 11:48

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