map Matrix -- make a map

map Matrix -- make a map

Synopsis:

Function: map -- make a map

Input:

an instance of class Matrix.

Output:

an instance of class Matrix.

Optional arguments :

map(..., Degree)

map(..., DegreeMap => ...)

map(f, Degree => d) -- make a map of degree d from a map f of modules by tensoring the source module with a free module of rank 1 and appropriate degree.

Code:

     -- ../../../Macaulay2/m2/matrix1.m2:16-22
     map(Matrix) := Matrix => options -> (f) -> (
          if options.Degree === null then f
          else (
               R := ring source f;
               d := options.Degree;
               if class d === ZZ then d = {d};
               map(target f, source f ** R^{d - degree f}, f, options)))