Created
December 11, 2017 20:42
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outer_product <- function (a, b) { | |
c(a[2]*b[3] - a[3]*b[2], a[3]*b[1] - a[1]*b[3], a[1]*b[2] - a[2]*b[1]) | |
} | |
d <- function(t) { | |
s <- t/sqrt(3) | |
h <- sqrt(1 - ((1 + sqrt(3)/2)^2 + (1/2)^2)*s^2) | |
A <- c(s, 0, 0) | |
B <- c(-1/2*s, sqrt(3)/2*s, 0) | |
A_ <- c(-sqrt(3)/2*s, 1/2*s, h) | |
B_ <- c(0, -s, h) | |
AA_ <- A_ - A | |
BB_ <- B_ - B | |
BA <- A - B | |
AA_xBB_ <- outer_product(AA_, BB_) | |
((A - B) %*% AA_xBB_) / sqrt(AA_xBB_ %*% AA_xBB_) | |
} | |
ts <- (1:89)/100 | |
ds <- c() | |
for (i in 1:89) { | |
ds[i] <- d(ts[i]) | |
} | |
plot(ts, ds, type="l") |
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