plot output function

no, I'm afraid abline does not help, it works only for straight lines.

The output of my function is a vector of fitted values (called fit).
I would like to superimpose the fitted regression line to the
scatterplot of the data. 
Therefore, I use the commands "plot(x,y)"to display the scatterplot;
then
"lines(x,fit)" to add the estimated regression line.
The graph displays the scatterplot correctly but not the fitted
regression line.
When I use the command "plot(x,fit)" I get the correct regression line
but the plot is very rough, it looks like that, instead of a single
clear line, I get several thin lines.

Hope this is clearer.

Thank you,

Chiara

cp133 wrote:

Hi,

I have written my own function to estimate a local linear regression.
When I plot the output vector on the scatterplot of the data, the
function lines does not work and I get a rescaled regression line.
When I plot the output vector alone, the graph looks right, but choosing
the type "line" instead of the default does not deliver a clear single
line.

Does somebody know why this is happening.

Does abline() help?

If not, please be more specific in your question and tell us what you
are exactly going to do.

Uwe Ligges