please show me simple example how to plot "Distance-Weighted Least Squares" fitting

It's impossible to give you really good advice without an example of
your data, the R code you used and the error message.

But here's a simple scatterplot example:

fakedata <- data.frame(x=runif(15), y=runif(15))
plot(fakedata$x, fakedata$y)

or since you mentioned a line:

fakedata <- fakedata[order(fakedata$x),]
plot(fakedata$x, fakedata$y, type="l")

For anything more, we would need the information requested in the
R-help posting guide linked at the bottom of each and every R-help
message.

Sarah

I got simple x,y pairs of data and simple scatterplot and just cannot figure
how to do it , there are many examples but always there is error popping out

please show me an example stripped with additional data just core of what I
need to do to get this damn line

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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

Sarah Goslee
http://www.functionaldiversity.org