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dpb
Posts:
8,231
Registered:
6/7/07


Re: calculate the area of a curve
Posted:
Mar 24, 2013 8:53 AM


On 3/23/2013 6:24 PM, dpb wrote: > On 3/23/2013 6:17 PM, angelina wrote: > ... > >> The thing is , that for the first line I don't have the equation.I only >> have the three points .Is there a way to find it in Matlab? > > How would you find it given the points using pencil and paper? That > should give you an idea of how to find it using Matlab. > > Do you know a priori the points are identically on a straight line or is > this a regression problem?
OK, I looked at the actual data points  I see it is a segmented curve you've drawn. OK, one way w/o computing the coefficients of the line in Matlab (easy enough, of course :) ) to fine your intersection point would be via
doc interp1
Think of which it is that you're looking for while reading...




