Services & ResourcesWolfram ForumsMathGroup Archive

[Date Index] [Thread Index] [Author Index]

"Null" appearing in exported gif

• To: mathgroup at smc.vnet.net
• Subject: [mg63403] "Null" appearing in exported gif
• From: "Seung Lim" <selim50 at gmail.com>
• Date: Thu, 29 Dec 2005 02:57:34 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

Hello everyone,

I keep on getting "Null" on the left top of many frames of GIF file
generated and can't figure out why.  It doesn't appear w/in the nb,
only appears when the gif file is viewed.  Can anyone help?

Thanks in advance and happy new year to everyone,
Seung Lim

************************************************************
<< Graphics`Graphics`
<< Graphics`Legend`

(* Animation parameters *)
stepsize = .5;
metacycles = 50;
(* Graph parameters *)
lthick = .015;
isize = 325;

(* Freq parameters *)
freqA = 3.2;
freqB = 2;

prevSymbol = " ";
pastSymbol = " ";

symtext[h1_, h2_] := Which[
      						h1 <  .5 && h2 < .5, "S00",
      						h1 < .5 && h2 > .5, "S01",
      						h1 >  .5 && h2 < .5, "S10",
      						h1 > .5 && h2  > .5, "S11"
                                          ] ;


symbol[currText_] := Which[
      						currText == "S00", "\!\( S \_ 0 \)",
      						currText == "S01", "\!\( S \_ 1 \)",
      						currText == "S10", "\!\( S \_ 2 \)",
      						currText == "S11", "\!\( S \_ 3 \)",
      						currText == "S**", "\!\( S \_ ** \)",
      						currText == "S*0", "\!\( S \_ *0 \)",
      						currText == "S*1", "\!\( S \_ *1 \)",
      						currText == "S0*", "\!\( S \_ 0* \)",
      						currText == "S1*", "\!\( S \_ 1* \)"
      						];

eventSymbol[a_, b_, z_] := Which[
      								a â?  z, "no symmetry",
      								a == "\!\( S \_ 0 \)" && b == "\!\( S \_ 1 \)", "\!\( W \
\_01\)",
      								a == "\!\( S \_ 1 \)" &&
      b == "\!\( S \_ 0 \)", "\!\( W \_10\)",
      								a == "\!\( S \_ 2 \)" && b == "\!\( S \_ 3 \)",
       "\!\( W \_23\)",
      								a == "\!\( S \_ 3 \)" && b == "\!\( S \
\_ 2 \)", "\!\( W \_32\)",
      								a == "\!\( S \_ 0 \)" && b == "\!\( S \_ 2 \)",
        "\!\( W \_02\)",
      								a == "\!\( S \_ 1 \)" && b == "\!\( S \_ 3 \)",
        "\!\( W \_13\)",
      								a == "\!\( S \_ 2 \)" && b == "\!\( S \_ 0 \)",
          "\!\( W \_20\)",
      								a == "\!\( S \_ 3 \)" && b == "\!\( S \_ 1 \)",
          "\!\( W \_31\)",
      								a == " " || b == " " || c == " ", "blank"
      							];


sqwv[x_, period_] := UnitStep[Mod[x/period, 1] - 1/2];


	bFwd = Table[   {


        				currText = Evaluate[symtext[sqwv[(
        freqA*t), 1], sqwv[(freqB*t), 1]]];
        currSymbol = symbol[currText];
        If[currSymbol â?  prevSymbol,
          eSymbol = eventSymbol[pastSymbol, prevSymbol, currSymbol]];


        				DisplayTogether[
          								 Plot[{sqwv[freqA *(x + t), 1] + .1, sqwv[freqB *(x +
t), \
1] + 1.3}, {x, 0, 1}, PlotRange -> {0, 2.4}, PlotStyle -> {{Hue[
                0.0], Thickness[.011]}, {Hue[0.7], Thickness[.012]}},
Ticks \
-> {Automatic, None}, Frame -> True,
            FrameLabel -> {"
              ", " ", "Time = " <> ToString[PaddedForm[t, 3]], " "},
             PlotLegend -> {"freqA = " <> ToString[freqA] , "freqB = "
<>
                ToString[freqB]},

            LegendPosition -> {0.12, -0.9}, LegendSize -> {.7, .3},
                LegendTextSpace -> 5, TextStyle -> {FontWeight ->
"Bold", \
FontSize -> 11}],


            		Graphics[{Dashing[{0.02}], Line[{{.1, -.37}, {.1,
.5}}]}],


                  Graphics[Text[StyleForm[eSymbol, FontSize -> 14,
FontFamily \
-> "Helvetica", FontWeight -> "Bold"], {-0.25, -0.9}, {0, -1}]],


                    	Graphics[Text[StyleForm[currSymbol, FontSize ->
14, \
FontFamily -> "Helvetica", FontWeight -> "Bold"], {-0.25, -0.75}, {0,
-1}]]],


                                    pastSymbol = prevSymbol;
        			prevSymbol =   currSymbol ;
                                      }

      			, {t, 0, 5 - stepsize, stepsize}

      ];

Export["bFwd.gif", bFwd, ConversionOptions -> {"Loop" -> True, "
                  AnimationDisplayTime" -> 0.6 }, ImageSize -> 350];