Pcb calculator: remove unused variable

Fixes https://gitlab.com/kicad/code/kicad/issues/3907

pcb_calculator/transline/rectwaveguide.cpp

@@ -35,7 +35,6 @@ RECTWAVEGUIDE::RECTWAVEGUIDE() : TRANSLINE()
 
     // Initialize these here variables mainly to avoid warnings from a static analyzer
     mur = 0.0;                  // magnetic permeability of substrate
-    tanm = 0.0;                 // Magnetic Loss Tangent
     a = 0.0;                    // width of waveguide
     b = 0.0;                    // height of waveguide
     l = 0.0;                    // length of waveguide
@@ -192,7 +191,6 @@ void RECTWAVEGUIDE::get_rectwaveguide_sub()
     m_murC  = getProperty( MURC_PRM );
     m_sigma = 1.0 / getProperty( RHO_PRM );
     m_tand  = getProperty( TAND_PRM );
-    tanm  = getProperty( TANM_PRM );
 }
 
 

pcb_calculator/transline/rectwaveguide.h

@@ -31,7 +31,6 @@ public: RECTWAVEGUIDE();
 
 private:
     double mur;                 // magnetic permeability of substrate
-    double tanm;                // Magnetic Loss Tangent
     double a;                   // width of waveguide
     double b;                   // height of waveguide
     double l;                   // length of waveguide

pcb_calculator/transline/transline.h

@@ -42,7 +42,6 @@ enum PRMS_ID
     MUR_PRM,
     TWISTEDPAIR_EPSILONR_ENV_PRM,
     MURC_PRM,
-    TANM_PRM,
     FREQUENCY_PRM,
     Z0_PRM,
     Z0_E_PRM,

pcb_calculator/transline_ident.cpp

@@ -241,8 +241,6 @@ TRANSLINE_IDENT::TRANSLINE_IDENT( enum TRANSLINE_TYPE_ID aType )
 
         AddPrm( new TRANSLINE_PRM( PRM_TYPE_SUBS, MUR_PRM,
                                    _( "mu Rel I:" ), _( "Relative Permeability (mu) of Insulator" ), 1, false ) );
-        AddPrm( new TRANSLINE_PRM( PRM_TYPE_SUBS, TANM_PRM,
-                                   _( "TanM:" ), _( "Magnetic Loss Tangent" ), 0, false ) );
         AddPrm( new TRANSLINE_PRM( PRM_TYPE_SUBS, MURC_PRM,
                                    _( "mu Rel C:" ), _( "Relative Permeability (mu) of Conductor" ), 1,
                                    false ) );