[R] what is the difference between using function predict() and coef() in prediction

[tony333]

i do not know what is the difference between predict() and coef()
i use the two function give me different result 
zz = predict(xy.lm,list(T8=T8))
ss = coef(xy.lm)[1]+(coef(xy.lm)[2])*T8
where is t8 is the data used in prediction did not use in the fitting in
training sample where every sample is 15 value


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