Base of Unit Space Incorrectly Constructed

[davidkowalk]

If less than 7 variables are provided the program has to guess the remaining to construct a linearily independant basis. Instead the script currently pads the identity matrix. See src/interpreter.py at line 18 to 23.

Instead we need to systematically find linearly independent vectors.

Example for triggering the bug:

Input

Variable 1: p = 100000kg m^-1 s^-2  
Variable 2: V = 0.25 m^3
Variable 3: n = 130 mol
Variable 4: R = 8.3145 kg m^2 s^-2 mol^-1 K^-1

Units for target: K

Expected:

p^1 V^1 n^-1 R^-1

Got:

Matrix is not invertible. The provided Vectors may not be linearily independent.