numpy (matrix solver) - python vs. matlab

[Colin J. Williams]

On 01/05/2012 2:43 PM, someone wrote:
[snip]
>> a = [1 2 3]; b = [11 12 13]; c = [21 22 23].
>>
>> Then notice that c = 2*b - a. So c is linearly dependent on a and b.
>> Geometrically this means the three vectors are in the same plane,
>> so the matrix doesn't have an inverse.
>

Does it not mean that there are three parallel planes?

Consider the example in two dimensional space.

Colin W.
[snip]