[SciPy-user] the meaning of c_ and r_

Alan G Isaac aisaac at american.edu
Fri Oct 22 16:33:34 CDT 2004


On Fri, 22 Oct 2004, Travis Oliphant apparently wrote:
> The idea of r_  was to allow fast creation of arrays similar to what is
> available with MATLAB.  I wanted a short, quick way to concatenate and
> generate arrays.  For 1-d arrays, r_ and c_ are supposed to be exactly
> the same.  It's only when you give them two dimensional arrays that they
> differ.  Admittedly, I really like the one-dimensional array creation
> ability of r_  and I use it quite often.  The two-dimensional array
> creation is not as good.  bmat is intended to improve that some.    I am
> open to any ideas about how to improve this.  Perhaps, we just kill c_
> and suggest something else (like an improved bmat) for building 2-d
> arrays quickly.

I find both r_ and c_ nice to have around.
I would request a single change:
that for 1-d arrays,
one of them return transpose([x]) instead of x.
(In my view, r_ should do this, but whatever.)

fwiw,
Alan




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