Nothing
v1 <- c(1, 0, 0)
v2 <- c(1, 1, 1)
v3 <- c(1, 2, 3)
x <- c(2, 7, 3)
vdecomp2(x, v1, v2) %>% lapply(round, digits = 8)
a1 <- vdecomp2(x, v1, v2)$coefficients[1]; a1
b1 <- vdecomp2(x, v1, v2)$coefficients[2]; b1
x1 <- a1 * v1 + b1 * v2; x1
# decompose x into x1 and v3
vdecomp2(x, x1, v3) %>% lapply(round, digits = 8)
a2 <- vdecomp2(x, x1, v3)$coefficients[1]; a2
b2 <- vdecomp2(x, x1, v3)$coefficients[2]; b2
# this should equal x
a2 * (a1 * v1 + b1* v2) + b2 * v3
# the three coefficients
c(a2 * a1, a2 * b1, b2)
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