How to put lines with pre-defined slopes on a plot

Hi all. I want to put lines with pre-defined slopes (i.e. between 0.85 and 1.15) onto a matlab plots. Any help is much appreciated.Thanks

[Jan]

What exactly is your question? Draw the lines with the line() command.

[Qaisar Latif]

Hi Jan, Thanks for the comment. I have two datsets x and y. when I do the log log plotting I get the above plot.

There are certain data points in x and y that corresponds to a slope of 1, i.e., x(1:15, 1) and y(1:15, 1) and there are other points that give a slope of 0.85 and so forth.

What I want to do is to keep the original plot and then put a line with slope 1 or 0.85 on top of it. This way I can graphically represent that certain range of data points in original data set matches with a line of slope 1/0.85.

I hope this clarifies the problem.

[Mathieu NOE]

hello

you simply have to compute the derivative of your data (gradient )and search the points where the slope reaches the two targeted values

it's then fairly simple to draw a portion of line knowing the x and y coordinates and the slope