[R] global optimisation with inequality constraints

[geeknick]

Please advice on the package I should use to run a linear regression model
(weighted least squared) with linear equality constraint. I initially tried
"constrOptim" but it turned out that it only supported 
http://solve-graph-linear-inequalities.blogspot.com/2011/11/blog-post.html
linear inequality  constraint. Thank you very much in advance. 

Cheers, 

NICK

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