R Under development (unstable) (2023-11-08 r85496 ucrt) -- "Unsuffered Consequences"
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> ##
> ##  s u b s p a c e . r  Test suite
> ##
> 
> 
> orth <- pracma::orth
> subspace <- pracma::subspace
> 
> is.null(orth(c()))
[1] TRUE
> M <- matrix(1:12, 3, 4)
> all.equal(orth(M),
+           matrix(c(-0.504533, -0.760776,
+                    -0.574516, -0.057141,
+                    -0.644497,  0.646495), 3, 2, byrow = TRUE),
+           tolerance = 1e-5)
[1] "Mean relative difference: 2"
> 
> H <- pracma::hadamard(8)
> A <- H[, 2:4]
> B <- H[, 5:8]
> all.equal(subspace(A, B), pi/2, tolerance = 1e-10)  
[1] TRUE
> 
> proc.time()
   user  system elapsed 
   0.17    0.01    0.17