Hi
I'm trying to find the 2 separate areas for a Force * Displacement graph. The graph is basically 2 non-perfect, not-symmetrical half ellipses that connect at the x axis.
I need to specifically find the work done (area) for positive and negative forces but not sure how I could do it?
I have the data stored in 2 vectors but is there any way to only find the area of the graph above or below the x axis?
Or is my only choice to truncate the vectors to separate the graph into 2 and use 'trapz' function?
I am a beginner at MATLAB so please go easy on me!
Thank you for any help/tips π
EDIT:
The reason I dislike the idea of removing the data to separate into positive and negative values of Y axis is because the data alternates and so becomes tiring having to remember which data values to remove from both vectors to maintain the correct plots.
I have found an easy way to separate the Y values from positive to negative (testing(testing < 0) = [];) but then I do not know which elements to delete in the X axis vector (as they can be both +ve and -ve).
If I do trapz(Y_Vector) when it has been separated into positive values, would it work to just multiply by the range of the X_Vector?
Best Answer