How to measure graph wave distance ?

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MARLIANA HAFIZA
MARLIANA HAFIZA 2024-9-23
评论： MARLIANA HAFIZA 2024-9-23
I want to find the distance between the graph and straight line as shown below,
Thank you.
  2 个评论
Shashi Kiran
Shashi Kiran 2024-9-23
Hi @MARLIANA HAFIZA,
Do you have the specific points on the curve and the line available?
MARLIANA HAFIZA
MARLIANA HAFIZA 2024-9-23
I want to find the distance for all the points together. I have the points value for each line

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回答（1 个）

Bruno Luong
Bruno Luong 2024-9-23
编辑：Bruno Luong 2024-9-23
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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