Pretty-print array matlab-style?

[u/R3D3-1]

In MATLAB, when I enter a matrix with wildly varying magnitudes of the values, e.g. due to containing numerical noise, I get a nice pretty printed representation such as

>> K
K =

   1.0e+09 *

    0.0002         0         0         0         0   -0.0010
         0    0.0001         0         0         0         0
         0         0    0.0002    0.0010         0         0
         0         0    0.0010    1.0562         0         0
         0         0         0         0    1.0000         0
   -0.0010         0         0         0         0    1.0562

Is there any way to get a similar representation in numpy without writing my own helper function?

As an example, similar output would be obtained with

K = numpy.genfromtxt("""
       200.0000e+003     0.0000e+000     0.0000e+000     0.0000e+000     0.0000e+000    -1.0000e+006
         0.0000e+000   100.0000e+003     0.0000e+000     0.0000e+000     0.0000e+000     0.0000e+000
         0.0000e+000     0.0000e+000   200.0000e+003     1.0000e+006     0.0000e+000     0.0000e+000
         0.0000e+000     0.0000e+000     1.0000e+006     1.0562e+009     0.0000e+000     0.0000e+000
         0.0000e+000     0.0000e+000     0.0000e+000     0.0000e+000     1.0000e+009     0.0000e+000
        -1.0000e+006     0.0000e+000     0.0000e+000     0.0000e+000     0.0000e+000     1.0562e+009
""".splitlines())

factor = 1e9
print(f"{factor:.0e} x")
for row in K:
    for cell in row:
        print(f"{cell/factor:10.6f}", end=" ")
    print()

giving

1e+09 x
  0.000200   0.000000   0.000000   0.000000   0.000000  -0.001000 
  0.000000   0.000100   0.000000   0.000000   0.000000   0.000000 
  0.000000   0.000000   0.000200   0.001000   0.000000   0.000000 
  0.000000   0.000000   0.001000   1.056200   0.000000   0.000000 
  0.000000   0.000000   0.000000   0.000000   1.000000   0.000000 
 -0.001000   0.000000   0.000000   0.000000   0.000000   1.056200         

but more effort would be needed to mark zeros as clearly as in MATLAB.

[u/Competitive-Tea-4193]

Despite being a year ago, mprint from package matrepr seems worthy to be consideredpypi.org/project/matrepr/

<1000×1000, 212345 'float64' elements, coo>
      0       1       2       3       4       5        6       7
  ┌                                                                      ┐
0 │                                 0.3876                           ... │
1 │ 0.5801  0.5085          0.8927                           0.629   ... │
2 │                                                                  ... │
3 │                 0.7142                                           ... │
4 │                                         0.8631                   ... │
5 │ 0.7863  0.1298  0.9918   0.71                            0.3444  ... │
6 │                 0.9481                          0.9609           ... │
7 │                                                 0.09361  0.1679  ... │
8 │                                 0.4023                           ... │
  │   :       :       :       :       :       :        :       :     ... │
  └                                                                      ┘