Re: "Null" appearing in exported gif
- To: mathgroup at smc.vnet.net
- Subject: [mg63425] Re: "Null" appearing in exported gif
- From: "Norbert Marxer" <marxer at mec.li>
- Date: Fri, 30 Dec 2005 04:43:50 -0500 (EST)
- References: <dp05m6$g63$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Hello You get a Null in your graphics, because Table produces the following list: {{-Graphics-,Null},{-Graphics-,Null},...} This happens because your command has (essentially) the following structure: bFwd=Table[{ ...;DisplayTogether[...], pastSymbol=prevSymbol;prevSymbol=currSymbol; }, {t,0,5-stepsize,stepsize}] Because of the comma after DisplayTogether you get 2 items for each element of the list (i.e. a list of pairs): the fist element is the graphics object (from DisplayTogether), the second is the Null (because of the semicolon after currSymbol). To get rid of the Null, you can modify the input in the following way: 1. use the symbol gr to store the graphics 2. replace the comma after DisplayTogether with a semicolon 3. insert the symbol gr after "currSymbol;" 4. optional: you can eliminate the curly brackets of Table[{...},{...}]: i.e. Table[...,{...}] bFwd=Table[{ ...;gr=DisplayTogether[...]; pastSymbol=prevSymbol;prevSymbol=currSymbol; gr }, {t,0,5-stepsize,stepsize}] With these modifications everything works nicely. Best regards Norbert Marxer www.mec.li