Ramón García Fernández wrote:

I need to recognize the type of figure geometric for the number of sides, perimeter and area by discrete Fourier transform one-dimensional

Interesting. Do you have a particular range of geometric figures in mind (I'm guessing regular polygons, but maybe you want irregular polygons as well). How do intend to express the data for each figure (eg, radius versus angle about some point internal to the polygon, length of each side and associated turning angle, array of (x,y) vertices)? Do have a model for doing the analysis or are you looking for ideas on that front as well as how to implement it in Mathcad? What version of Mathcad are you using (it may make a difference if you're using Prime rather than, say, Mathcad 14 or 15).

Stuart