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Frank: Blomqvist's beta to copula parameter, vectorized
frank_beta2cpar(beta, cpar0=0,mxiter=20,eps=1.e-8,iprint=FALSE)
vector of Frank copula parameters with the given betas
vector of Blomqvist's beta values, -1<beta<1
starting point for Newton-Raphson iterations
maximum number of iterations, default 20
tolerance for convergence, default 1.e-8
print flag for iterations, default FALSE
Solve equation to get cpar given Blomqvist's beta, Newton-Raphson iterations; vectorized input beta is OK, beta=0 fails
b = seq(-0.2,0.5,0.1) frank_beta2cpar(b) frank_beta2cpar(b,iprint=TRUE)
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