Area between function and polyline

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An Ku
An Ku 2018-4-26
评论： An Ku 2018-4-27
Hi everyone I have a problem. I try to calculate the area between a linear function (red) and a polyline (blue). I hope someone can help me.

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Jan
Jan 2018-4-26
How are the values of the lines stored? In two vectors containing Y values to the the same X coordinates? If so:
match = (y_blue <= y_red);
Area = cumtrapz(y_red(match) - y_blue(match))
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An Ku
An Ku 2018-4-27
Thank very much. :) May you have an idea how I can visualize this area in a plot?

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