The matrix is a system Neo, that system is our enemy.
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This simple tool displays the square of the 2-norm of a wavefunction. This is simply the square of the mp-norm program, but often mp-norm2 is more convenient.
mp-norm
mp-norm2
Computational complexity: constant
usage: mp-norm2 <wavefunction>
$ mp-norm2 psi 3.1482114624