c2a | R Documentation |
Compute the 'a' G-spline coefficients from 'c' G-spline coefficients.
c2a(ccoef, which.zero = which.max(ccoef), toler = 1e-6)
ccoef |
A vector of 'c' G-spline coefficients. |
which.zero |
An index of the 'a' G-spline coefficient which will be zero (the reference one). |
toler |
All 'c' coefficients smaller in absolute value than |
'c' and 'a' G-spline coefficients are related by the expression
c[j] = exp(a[j])/[exp(a[1]) + ... + exp(a[g])], j = 1, ..., g,
where a[k] = 0, k = which.zero
.
This function transforms the 'c' coefficients into their 'a' counterparts.
A vector of same length as ccoef
with 'a' G-spline coefficients.
Arnošt Komárek arnost.komarek@mff.cuni.cz
a2c
ccoef <- c(0.1, 0.2, 0.15, 0.3, 0.25) ### Compute 'a' counterparts acoef <- c2a(ccoef, 1) print(acoef) ### And back 'c', ccoef2 should be same as ccoef ccoef2 <- a2c(acoef) print(ccoef2)
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