I've been working to incorporate the astropy.wcs code as a backend (one of several options) to the WCS functionality in [GalSim](https://github.com/GalSim-developers/GalSim), and I ran into a few prob…
This overlaps somewhat with #815.
At the moment there is no full-transformation from world to pixel coordinates. From what I understand, this is because some of the WCS math is not analytically inver…
For every chunk and window size, we need to dimensionally reduce it and save it as a named-column in a pandas array, or a nested dictionary.
This way, we can scan through all window sizes, sliding i…
On the front page, the definition for bijection is given:
> A Bijection is an invertible function that converts back and forth between two different types, with the contract that a round-trip through…
Signature of dct and idct both are :: Vector (Complex Double) → Vector Double. It's implied that dct is invertible but it's obviously not. Only n out 2n degrees of freedom survive transformation and t…
The following code returns an incorrect result:
```
mm=Matrix(GF(2),[[1,0,1,0,0,0,1],[1,0,0,1,1,1,0],[1,1,0,1,1,1,1],[1,1,1,0,1,1,1],[1,1,1,0,0,1,0],[1,1,1,0,1,0,0],[1,1,1,1,1,1,0]])
_,S = mm.jorda…
I was doing the following, when testing the jordan_form method...
```
sage: A=Matrix(ComplexField(200),[[1,-2],[2,-1]])
sage: jordan=A.jordan_form(transformation=True,subdivide=False)
sage: P=jord…