HI everybody, Thanks for your answers, I can't provide data here, but I can explain more:
It's satellite images as a text file (ascii). Two different images with two different variables, land surface temperature (LST -lstascii =filename) and an vegetation index (NDVI - ndviascii = filename). The aim was to do a scatter plot of NDVI against LST, whereas the NDVI should be on the x-axis. - The scatter plot itself is not needed as you will see. As I cannot compare each value (pixel value) in one image to the respective value in the other image, i had the idea to sort all columns one under each other. In the end I would have one column of one variable. I wanted to put the two variables LST and NDVI together in one table, so that I have two columns with two variables, and the value of one variable (NDVI) in each row can be compared directly to the value of the other variable (LST) in the same row. Why that? I wanted to sort the columns by the NDVI variable and make 0,01 NDVI intervals. From each of these intervals I wanted to know the max and min LST. These values I need for the regression - see the graph in the file attached. I this more clear now? Attached you can see the regression line I need to find. For this I developed this process (because I cannot compare pixel value by pixel value in a multi column and row table). <http://r.789695.n4.nabble.com/file/n4648382/scatterplot.jpg> Best Regards -- View this message in context: http://r.789695.n4.nabble.com/some-help-tp4648316p4648382.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
