How to Suppress Warning Messages

[Thomas D. Dean]

I get warning messages from gnuplot.  Any way to suppress them?

I have tried several versions of warning within the function.

In a function, I do:

octave:1051> a0 = 1e7;
octave:1052> p1 = 55;
octave:1053> p2 = 1e6;
octave:1054> z1 = 4.3e6;
octave:1055> s = tf('s');
octave:1056> TFopen = a0 * (1+s/z1) / (1+s/p1) / (1+s/p2);
octave:1057> Gfb = 10;
octave:1058> b = 1/Gfb;
octave:1059> R1 = 10e3;
octave:1060> R2 = R1 * (1/b - 1)
R2 =  90000
octave:1061> TFstage1 = feedback(TFopen,b);
octave:1062> L = TFopen * b;
octave:1063> S = feedback(1, L)

Transfer function 'S' from input 'u1' to output ...

       1.818e-08 s^2 + 0.01818 s + 1
 y1:  --------------------------------
      1.818e-08 s^2 + 0.2507 s + 1e+06

Continuous-time model.
octave:1064> bodemag(TFstage1,'b',S,'g');
octave:1065> close
octave:1066> margin(L);
           line 0: warning: Skipping data file with no valid points
           line 0: warning: Skipping data file with no valid points
           line 0: warning: Skipping data file with no valid points

Tom Dean