How to Compute the Volume under contour lines?

hi, output of my data set is 5x15 matrix, with this a contourf was plotted. the plot displays differnt colous since i used contourf command. so, i would like to compute volume of each contour line, iam having area under each contour line (this is for further information only) .. please help me.

Answer 1

[KSSV]

You may get the volume using trapz. YOu may have a look into following link:

https://blogs.mathworks.com/loren/2011/06/13/calculating-the-area-under-a-surface/

[laxminarayana pasupuleti]

Thank you for reply, as per your suggestion, i use below code trapz(y,trapz(x,Z,2),1)..this is giving some answer but it was wrong.. can you tell me, in abobe code what is meaning of 2 and 1..