How to measure graph wave distance ?
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I want to find the distance between the graph and straight line as shown below,

Thank you.
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Bruno Luong
le 23 Sep 2024
Modifié(e) : Bruno Luong
le 23 Sep 2024
It looks like you need to rotate the whole picture (red line + blue curve) to minus the slope of the red line.
After rotation the redline become horizontal; then tthe distance is just the differential y-coordinate (after rotation) of the any blue points to the y-coordinate of the horizontal red line
Rotation is multiply x-y coordinates by matrix, see wiki
R := [cos(theta) -sin(theta);
sin(theta) cos(theta)]
R*[x;y]
Use theta as minus the slope of red line. You must know the redlinne equaltion, so its slope somehow.
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