ListPlot skips first point

Themis Matsoukas

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May 22, 2013, 2:18:38 AM5/22/13

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In the particular example below, the first point of data2 is *not* plotted. If I drop the last point of data2, then the first point comes into view. Not sure why.

data1 = {{1, 11.07}, {120, 11.07}};
data2 = {{1, 11.07}, {2, 2.15}, {3, 0.83}, {4, 0.43}, {5, 0.26}, {6,
0.17}, {7, 0.12}, {8, 0.09}, {9, 0.07}, {10, 0.06}, {11,
0.05}, {12, 0.04}, {13, 0.03}, {14, 0.03}, {15, 0.03}, {16,
0.02}, {17, 0.02}, {18, 0.02}, {19, 0.02}, {20, 0.01}, {21,
0.01}, {22, 0.01}, {23, 0.01}, {24, 0.01}, {25, 0.01}, {26,
0.01}, {27, 0.01}, {28, 0.01}, {29, 0.01}, {30, 0.01}, {31,
0.01}, {32, 0.01}, {33, 0.01}, {34, 0.01}, {35, 0.01}, {36,
0.01}, {37, 0.01}, {38, 0.01}, {39, 0.01}, {40, 0.01}, {41,
0.01}, {42, 0.01}, {43, 0.01}, {44, 0.01}, {45, 0.01}, {46, 0.01}};

Show[
ListLogPlot[data1, PlotStyle -> Red, Joined -> True,
PlotRange -> {{0, 20}, {0.001, 100}}],
ListLogPlot[data2, PlotStyle -> Blue, Joined -> True]
]

This is with v9 for the Mac.

Kevin J. McCann

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May 23, 2013, 3:52:15 AM5/23/13

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It plots fine for me. Windows 7, V9.0.1.

Kevin

Bob Hanlon

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May 23, 2013, 3:53:16 AM5/23/13

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I see this problem with v 9.0.0.0, but this does not occur with v 9.0.1.0
under Mac OS X 10.8.3

Bob Hanlon

djmpark

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May 23, 2013, 3:52:56 AM5/23/13

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When I evaluate your statements (using Show) in M 9.0.1 on Windows the first
point of data2 is plotted.

The following is a more detailed plot using Presentations with the points
shown and Tooltips on the data2 points, clearly showing that the first point
is used.

<< Presentations`

yticks = CustomTicks[Log, {-4, 3, {1.}, {2, 5}}];
Draw2D[
{ListLogDraw[data1, Joined -> True, PlotStyle -> Red],
ListLogDraw[data2, Joined -> True, PlotStyle -> Blue],
CirclePoint[{First[#], Log[Last[#]]}, 3, Black, White] & /@ data1,
Tooltip[
CirclePoint[{First[#], Log[Last[#]]}, 3, Black,
LightBlue], #] & /@ data2},
Frame -> True,
FrameTicks -> {{yticks, yticks // NoTickLabels}, {Automatic,
Automatic}},
PlotRange -> {{0, 20}, {Log[0.001], Log[100]}},
ImageSize -> 400]

David Park
djm...@comcast.net
http://home.comcast.net/~djmpark/index.html

Bill Rowe

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May 23, 2013, 3:53:57 AM5/23/13

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On 5/22/13 at 2:19 AM, tmats...@me.com (Themis Matsoukas) wrote:

>In the particular example below, the first point of data2 is *not*
>plotted. If I drop the last point of data2, then the first point
>comes into view. Not sure why.

>data1 = {{1, 11.07}, {120, 11.07}}; data2 = {{1, 11.07}, {2, 2.15},
>{3, 0.83}, {4, 0.43}, {5, 0.26}, {6, 0.17}, {7, 0.12}, {8,
>0.09}, {9, 0.07}, {10, 0.06}, {11, 0.05}, {12,
>0.04}, {13, 0.03}, {14, 0.03}, {15, 0.03}, {16, 0.02}, {17, 0.02},
>{18, 0.02}, {19, 0.02}, {20, 0.01}, {21, 0.01}, {22, 0.01}, {23,
>0.01}, {24, 0.01}, {25, 0.01}, {26, 0.01}, {27, 0.01}, {28, 0.01},
>{29, 0.01}, {30, 0.01}, {31, 0.01}, {32, 0.01}, {33, 0.01}, {34,
>0.01}, {35, 0.01}, {36, 0.01}, {37, 0.01}, {38, 0.01}, {39, 0.01},
>{40, 0.01}, {41, 0.01}, {42, 0.01}, {43, 0.01}, {44, 0.01}, {45,
>0.01}, {46, 0.01}};

>Show[
>ListLogPlot[data1, PlotStyle -> Red, Joined -> True, PlotRange ->
>{{0, 20}, {0.001, 100}}], ListLogPlot[data2, PlotStyle -> Blue,
>Joined -> True]
>]

>This is with v9 for the Mac.

Interesting. When I copy and paste from your post it appears to
me the first point is plotted whether or not the last point in
data2 is deleted. This with

In[12]:= $Version

Out[12]= 9.0 for Mac OS X x86 (64-bit) (January 24, 2013)

spamsl...@gmail.com

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May 23, 2013, 3:55:18 AM5/23/13

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Reverse your data1 and data2 variables.

Show[ListLogPlot[data2, PlotStyle -> Red, Joined -> True,

PlotRange -> {{0, 20}, {0.001, 100}}],

ListLogPlot[data1, PlotStyle -> Blue, Joined -> True]]

I don't know why that works, but it does. :o

Themis Matsoukas

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May 24, 2013, 5:25:41 AM5/24/13

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After updating to 9.0.1 the problem was resolved.

Thanks.