I am able to calculate the theil sen estimator to determine the trend of hydroclimatic time series but unable to plot it. I tried with some online codes in matlab and able to repeat with the same input given there but not with my data.
Asfar as I understand your question: you have a time series with a possible linear trend. You estimated the Theil-Sen's slope, i.e. the median of all the possible tendencies computed from each pair of data. Then you can compute the coordinate at the origin (mean of the y -sen's slope* mean of the x). Then you can plot the line. If you don't succeed send me an email at [email protected] with your data set...