Plotting a line through 2 points

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Dennis
Dennis 2013-10-1
评论： Image Analyst 2020-9-15
Hello,
I have a file with a difference in acceleration between 2 conditions, filename is 'ad'. I need to draw a line through 25% and 75% of the max of this data and then find the x-position where this line intercepts the x-axis.
As an illustration, this is what I want to do: http://tinypic.com/r/rab7te/5
Any help is appreciated, thanks.

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Image Analyst
Image Analyst 2013-10-1
Use the line() function. Just figure out the two endpoints, which shouldn't be very hard at all. Use "hold on" before you call line() so that you don't blow away the curve.
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ErnestoE
ErnestoE 2020-9-15
Does this works for vertical lines too? i.e. if both values of x is the same?
Image Analyst
Image Analyst 2020-9-15
Yes. Just try it. And there is a new function xline() if you want the line to run all the way across the entire distance in y, instead of just between two points inside the axes.
xline(xLeft, 'Color', 'r', 'LineWidth', 3);

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