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IsPositiveGrading

check if a matrix defines a positive grading
Syntax 

IsPositiveGrading(M:MAT):BOOL

Description
This function determines whether a matrix defines a positive grading, i.e. foreach column the first nonnegative entry is positive.

Example 
  IsPositiveGrading(LexMat(5));
TRUE
-------------------------------
  IsPositiveGrading(Mat([[0,2,3], [1, -1, 0]]));
TRUE
-------------------------------
  IsPositiveGrading(Mat([[1,1], [0,-1], [-1, 0]]));
TRUE
-------------------------------


See Also