generate biSAD1 covariance matrix
get_biSAD1(par, n1, n2)
par
: vector with four number, first two for ck and the rest for stressn1
: scalar indicate length of time1n2
: scalar indicate length of time2biSAD1 covariance matrix
get_biSAD1(par=c(2,0.5,2,0.1),n1=4, n2 = 5)
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