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 Apr8 revised Finding points along a plot in Matlab Added a table of sample data Apr8 comment Finding points along a plot in Matlab @macydanim: This is a great help. When I replace your signal with the data I have though, it doesn't hit the points on the 50%/90% line. I'll update the question with my dataset. Apr8 comment Finding points along a plot in Matlab That Matt. That's a useful start for me. Much appreciated. How would I go about getting Matlab to approximate a gaussian curve to fit the signal? From that I should be able to interpolate the 20% and 50% points. Apr8 asked Finding points along a plot in Matlab Mar23 accepted Solving the inverse of cos^2 Mar22 comment Solving the inverse of cos^2 Done. Keen for an edit on that if I have anything wrong. Thanks again for the guidance, it really helps to break these things down for me. Mar22 revised Solving the inverse of cos^2 Updated to include a hint provided by DonAntonio Mar22 comment Solving the inverse of cos^2 Very helpful. Thanks for that Don. So after substituting the alternative, I can solve for i. I might update the question to include this as it's easier to do formulas in there. Mar22 comment Solving the inverse of cos^2 I'm just not familiar with the notation (was daydreaming during my trig classes unfortunately). So cos^2(i) is the same as [cos(i)]^2? Mar22 asked Solving the inverse of cos^2 Mar15 awarded Popular Question Nov11 accepted Finding outliers in a linear series Nov11 comment Finding outliers in a linear series Thanks for that Peter. I've used option 2 and the results are pretty clear to me now. Nov11 asked Finding outliers in a linear series Oct17 accepted Finding the value which minimises all residuals Oct17 comment Finding the value which minimises all residuals Excellent. Thank you very much for that explanation. It helps immensely. Oct17 comment Finding the value which minimises all residuals Thanks Ross. A few things are confusing me here ... Shouldn't I be calculating $tan(\Delta RA)$ at each time, and comparing it with the result of the right term of the model? I then get the differences between the observed results and the model predicted results (right term), sum of their squares, and try to minimise that sum by Goal Seeking for different values of $R$. Does that sound right to you? Oct16 revised Finding the value which minimises all residuals edited tags Oct15 revised Finding the value which minimises all residuals cleared up the text Oct14 asked Finding the value which minimises all residuals