y-direction shearing matrix and its equivalence

Question

Hello every one
I want to know how rotation and scaling equivalent y-direction shearing matrix?

1     0     0

shx   1    -shy.xref

0     0      1

I understood what shearing mean but how can get it using rotation and scaling ??

thank you :)

Answer 1

Shearing cannot be constructed using just rotation and scaling.
Shearing is an affine transformation and rotation and scaling are "rigid" transformation which are less expressive.

more on this:
http://en.wikipedia.org/wiki/Affine_transformation