code: public static ZMatrixRMaj rectangle(int numRow , int numCol , double min , double max , Random rand ) {
          ZMatrixRMaj mat = new ZMatrixRMaj(numRow,numCol);
  
          fillUniform(mat,min,max,rand);
  
          return mat;
      }
docs: <p>
  Returns a matrix where all the elements are selected independently from
  a uniform distribution between 'min' and 'max' inclusive.
  </p>
  
  @param numRow Number of rows in the new matrix.
  @param numCol Number of columns in the new matrix.
  @param min The minimum value each element can be.
  @param max The maximum value each element can be.
  @param rand Random number generator used to fill the matrix.
  @return The randomly generated matrix.