[R] please help! what are the different using log-link function and log transformation?

[pigpigmeow]

I'm new R-programming user, I need to use gam function.

y<-gam(a~s(b),family=gaussian(link=log),data)
y<-gam(loga~s(b), family =gaussian (link=identity),data)
why these two command results are different?
I guess these two command results are same, but actally these two command
results are different, Why?

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