[R] log-link function problem

[pigpigmeow]

y<-gam(a~s(b),family=gaussian(link=log),data) 
y<-gam(loga~s(b), family =gaussian (link=identity),data)
y<-gam(loga~s(b),family=gaussian(link=log),data) 
what are the diffent these 3 equations?

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