Nothing
v1 <- c(1,0,0)
v2 <- c(1,1,1)
x <- c( 2,3,5)
vdecomp(x,v1,v2)
h <- x - vdecomp(x,v1,v2)$x.proj;
round(h,8)
round(dot(h,v1),8)
round(dot(h,v2),8)
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