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Re: IntegerPart

  • To: mathgroup at smc.vnet.net
  • Subject: [mg130319] Re: IntegerPart
  • From: Bob Hanlon <hanlonr357 at gmail.com>
  • Date: Tue, 2 Apr 2013 03:30:29 -0400 (EDT)
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  • References: <20130401045851.848996A96@smc.vnet.net>

The problem is not with IntegerPart, it is with the default setting for
PlotPoints in Plot. You are undersampling since the default value is too
low for your function.


Clear["Global`*"]
nSize = 100;

prefstate = Table[0, {nSize}];


Do[{prefstate[[i]] =
    If[EvenQ[i], 0.8, 0.4]},
  {i, nSize}];


Plot[
 prefstate[[IntegerPart[x]]],
 {x, 1, nSize + 1},
 AxesOrigin -> {0, 0},
 TicksStyle -> 18,
 PlotStyle -> Black,
 PlotPoints -> 125]


Alternatively, use SquareWave instead of prefstate


Plot[
 SquareWave[{0.4, 0.8}, x/2],
 {x, 1, nSize + 1},
 AxesOrigin -> {0, 0},
 TicksStyle -> 18,
 PlotStyle -> Black,
 PlotPoints -> 125,
 ExclusionsStyle -> Black]



Bob Hanlon


On Mon, Apr 1, 2013 at 12:58 AM, <dougwangsaif at gmail.com> wrote:

> can anyone help with this. There seems to be something wrong with the
> IntegerPart function. Please help!
>
> Clear["Global`*"]
> nSize = 100;
>
> prefstate = Table[0, {i, 1, nSize}];
> Do[
>   {prefstate[[i]] = If[EvenQ[i], 0.8, 0.4]},
>   {i, 1, nSize}
>   ];
>
> Plot[{prefstate[[IntegerPart[x]]]}, {x, 1, nSize + 1},
>  AxesOrigin -> {0, 0}, TicksStyle -> Directive[18],
>  PlotStyle -> {Black}]
>
>


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