Open the matrix window either by click on "Filter"  "Matrix" or by the toolbar. 



The matrix window shows always the matrix elements for the chosen filter topology in the structure window. 
 
Change element: The value of the chosen matrix element is displayed on the bottom left. By changing the value in this box, the chosen matrix element and therefore the curve will change. 
 
Tolerance: The tolerance of a matrix element can be entered in %. However, for a diagonal value it is the tolerance in % according to de filter bandwidth. 
 
Sweeps: Specifies how many sweeps are done for a sensitivity analysis. 
 
Analyze Sensitivity: Plots as many curves as specified in Sweeps changing the selected element from ± Tolerance. 
 
L/C: Select if inductive (L positive) or capacitive (C negative) couplings are prefered. 
 
Auto Plot Matrix: If Auto Plot Matrix is activated, CoupleFil updates the graph automatically if the matrix changes (CoupleFil may run slower). 
 
Plot Matrix: With the button on the bottom right the changed matrix can be displayed in the graph window. 