Dear R-users,

I'd like to fit a sine function to my data. The result should have a format
(and thus the formula, too)

y ~ a + sin(x+b)

where y and x are vectors, and a and b are (yet) unknown values.

The data sets (vectors x and y) are OK, and I can do a simple lm fitting
lm(y~x), or lm(y~I(sin(2*pi*x/360))), succesfully  My issue is that I'm not
able to do the optional linear shift in x (e.g. x+b). What other
possibilities should I use instead of lm? I looked searched the R-seek for
terms: fit, sine, lm, and combinations, but I could not find anything
useful. Anybody would be so kind and point me to the right direction where I
can find other fitting possibilities?

Thank you for listening and kind answers upfront.

Regards,
Milan

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