Finding the area of a polygon.

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Giuseppe
Giuseppe on 25 Mar 2014
Edited: Sean de Wolski on 25 Mar 2014
Hi I have a set of x and y coordinates which form the corners of a polygon. I need to calculate area manually using the shoelace formula as illustrated below.
I need to do this way of multiplying to get two vectors using vectorization. I am not sure of how I would write code for this. It needs to be so that if the amount of corners increased or there values their values changed this would be accounted for.
Thanks,

Accepted Answer

Sean de Wolski
Sean de Wolski on 25 Mar 2014
Edited: Sean de Wolski on 25 Mar 2014
>> edit polyarea
Look at the code, it implements the surveyor's formula that you have.

More Answers (1)

Image Analyst
Image Analyst on 25 Mar 2014
Is this homework, where you need to use that? Otherwise, just use the built in polyarea() function.
  2 Comments
Image Analyst
Image Analyst on 25 Mar 2014
You should have tagged it as homework then, but I did it for you. So, first read this: http://www.mathworks.com/matlabcentral/answers/8626-how-do-i-get-help-on-homework-questions-on-matlab-answers then show how you made some nested for loops to do the multiplication and ask for help. But you need to do something first. We can't just hand over a turnkey homework solution to you.

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