R Under development (unstable) (2023-11-08 r85496 ucrt) -- "Unsuffered Consequences"
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> ##
> ##  r e c t i n t . R  Tests
> ##
> 
> rectint <- pracma::rectint
> 
> x <- matrix(c(0, 0, 1, 1), ncol = 4)
> y <- matrix(c( 0.75,-0.25, 0.5, 0.5,
+                0.75, 0.25, 0.5, 0.5,
+                0.75, 0.25, 0.2, 0.5,
+                0.75, 0.75, 0.5, 0.5,
+                0.75,-0.25, 0.5, 1.5), ncol = 4, byrow = TRUE)
> 
> all.equal(rectint(x, y),
+           matrix(c(0.0625, 0.125, 0.1, 0.0625, 0.25), nrow = 1))
[1] TRUE
> 
> proc.time()
   user  system elapsed 
   0.10    0.06    0.15