How to analyze a three dimensional matrix???

Sir I have a matrix of dimension 40*40*13. so I have 13 data for each grid in the third direction for 13 years from 2000-2012. Now I have to find out a trend line for each grid, Say y=mx+c, where 'm' is the slope, y is the data and x is the years. I need only 'm' which i have to use so that i get a file having only slope of dimension 40*40. Please help me how to do it?

[Guillaume]

Is this homework? (sounds like it).

Your problem is fairly trivial. If you showed what you've done so far and where you're stucked, you'd have more chance to get a reply.

[Stephen23]

"Please help me how to do it?": in four easy steps:

• Understand the problem.
• Search online for examples of fitting lines to 3D data, and reading/writing files.
• Read the MATLAB documentation for the functions that are used.
• Write your own code to attempt to solve the problem.

Come and ask here if anything is not clear, giving exact examples of the code you are using, what you expect it to do, and what it does.

Answer 1

[Chad Greene]

If all you need is a map of slopes or linear trends, trend will do it.