R语言中，GLS(广义最小二乘法)函数是这样的——
gls(model, data, correlation, weights, subset, method, na.action,
control, verbose)
## S3 method for class 'gls'
update(object, model., ..., evaluate = TRUE)
optim(最优化函数)的函数是这样的——
optimize(f = , interval = , ..., lower = min(interval),
upper = max(interval), maximum = FALSE,
tol = .Machine$double.eps^0.25)
具体看你要做什么
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