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How does Mathematica implement ShearingMatrix?

In other words given the parameters $\theta$, $n$ and $v$, what is the formula behind it?

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  • $\begingroup$ ShearingMatrix evaluates for symbolic inputs. While it won't display the general formula used, it will show its particular expression for a given dimension. For instance in 2D, one can evaluate ShearingMatrix[\[Theta], {u1, u2}, {v1, v2}]. $\endgroup$ – user31159 Oct 27 '16 at 1:10
  • $\begingroup$ The general formula can be found with some spelunking: <<GeneralUtilities`; PrintDefinitions[ShearingMatrix]. $\endgroup$ – user31159 Oct 27 '16 at 1:11
  • $\begingroup$ @xavier This doesn't seem to work in Mathematica 10. It does nothing. $\endgroup$ – plasmacel Oct 27 '16 at 1:45
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    $\begingroup$ Ah OK, PrintDefinitions is from 10.1. You could have a look there for other spelunking tools. $\endgroup$ – user31159 Oct 27 '16 at 9:34
  • $\begingroup$ @xavier I tried this in 10.1 and it helped a lot, thanks. $\endgroup$ – plasmacel Oct 27 '16 at 12:10
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The code of symbols implemented in top-level can be seen by using PrintDefinitions.

For ShearingMatrix, one can evaluate

<<GeneralUtilities`
PrintDefinitions[ShearingMatrix]

and then click on System`TransformConstructorDump`iShearingMatrix to view the formula used.

PrintDefinitions is available from version 10.1. For earlier versions of Mathematica, other spelunking tools can be found in this post.

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