[IPython-User] How to configure/control line width?

[Robert Kern]

On 3/11/11 9:43 AM, Jorge Scandaliaris wrote:
> Hi all,
>
> Is there a way to configure ipython so when numpy arrays are displayed ipython
> would use all the available screen width?
>
> Ipython seems aware of screen width as doing:
>
> In [28]: print 'a'*200
> aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
> aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
> aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

IPython is not doing anything here. This is just your terminal wrapping the 
single line being printed.

> uses the available width, but doing:
>
> In [32]: a = np.ones((5,20))
>
> In [33]: repr(a)
> Out[33]: 'array([[ 1.,  1.,  1.,  1.,  1.,  1.,  1.,  1.,  1.,  1.,  1.,  1.,
> 1.,\n         1.,  1.,  1.,  1.,  1.,  1.,  1.],\n       [ 1.,  1.,  1.,  1.,
> 1.,  1.,  1.,  1.,  1.,  1.,  1.,  1.,  1.,\n         1.,  1.,  1.,  1.,  1.,
> 1.,  1.],\n       [ 1.,  1.,  1.,  1.,  1.,  1.,  1.,  1.,  1.,  1.,  1.,  1.,
> 1.,\n         1.,  1.,  1.,  1.,  1.,  1.,  1.],\n       [ 1.,  1.,  1.,  1.,
> 1.,  1.,  1.,  1.,  1.,  1.,  1.,  1.,  1.,\n         1.,  1.,  1.,  1.,  1.,
> 1.,  1.],\n       [ 1.,  1.,  1.,  1.,  1.,  1.,  1.,  1.,  1.,  1.,  1.,  1.,
> 1.,\n         1.,  1.,  1.,  1.,  1.,  1.,  1.]])'
>
> does not. Is this behavior configurable/controllable?

See np.set_printoptions(). In the 0.11 branch of development, we have a 
configurable printing system such that you could replace the printer for 
nnumpy.ndarray instances. However, you will have to ask the terminal for how 
wide it is, and this information is platform-specific, though not very difficult 
to obtain. You can see how I do this in my personal IPython extensions:

https://bitbucket.org/robertkern/kernmagic/src/tip/kernmagic/utils.py

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco