为什么 Gnuplot 的点链接不好？
问题描述 投票：0回答：1
我无法放置所有数据，因为：看起来您的帖子主要是代码；请添加更多详细信息。
所以你可以在这里找到我的数据：https://gitlab.com/v_alexandre/data/-/blob/master/data
脚本：
plot 'data' u 1:2 w l
正如你所看到的，我有两点联系在一起，但我不明白为什么？
你有什么想法吗？
1个回答
0
投票
投票
在数据的第 6 行之后插入一个空行。这将断开两个岛屿的连接。
脚本：
### disconnect lines
reset session
$Data <<EOD
9.2710321280228 41.364959299521
9.265698545799 41.362164776515
9.2558829669799 41.368794222327
9.2602446048541 41.373651229899
9.273659440522 41.369221791575
9.2710321280228 41.364959299521
8.5734085639674 42.381404942274
8.5869206603959 42.378959456159
8.6000271534091 42.369259196001
8.6100160917347 42.373593854505
8.620173521868 42.372270719131
8.6408019259839 42.37343904341
8.6504088344609 42.362352538519
8.6596703887356 42.359406967225
8.6819749384239 42.358462008729
8.6841460127953 42.347988396554
8.7110680867563 42.347099989534
# ... not all data shown...
EOD
plot $Data u 1:2 w l
### end of script
结果：
补充：
仅供记录，一些更多的解释和代码可能对其类似情况下的其他人有用。 您的数据似乎描述了封闭区域的点，例如一些岛屿的坐标。由于某些（不幸的）原因，您的各个岛屿没有被空线分隔，这就是 gnuplot 一次性绘制它的原因。 gnuplot 应该如何知道在哪里分隔？ 你必须告诉gnuplot在哪里产生不连续性。但你怎么知道？
好吧，如果这些都是封闭区域，那么起点和终点应该是相同的。因此，您需要遍历数据，每次找到相同的数据点时，您都会在后面引入一个间隙（空行）。 当然，您不想手动执行此操作，例如如果您想到加拿大的岛屿或芬兰的湖泊。 当然，您可以使用外部工具执行此操作并将数据保存到另一个文件，但您也可以使用 gnuplot 执行此操作。然而，对于最终结果，仅“举笔”而不修改数据可能就足够了。使用 gnuplot，您可以发挥“技巧”并使该行透明，例如颜色
0xff1234560xAARRGGBB0xff总结：定义一个函数，每次特定坐标再次出现后将颜色设置为透明。也许有人甚至可以简化该功能。
数据：
SO65655925.dat# x y
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-77.9856 22.3021
-77.9992 22.2987
-78.0067 22.248
-78.0417 22.2013
-78.0119 22.1664
-77.9124 22.1247
-77.8794 22.1275
-82.6818 21.8211
-82.7146 21.8903
-82.7558 21.9095
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-83.0777 21.8335
-83.0825 21.7914
-82.9736 21.5923
-83.0072 21.5656
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-83.1802 21.623
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-83.1415 21.5319
-83.0673 21.4694
-82.9596 21.4413
-82.8532 21.4439
-82.6548 21.5187
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-82.5678 21.6218
-82.6294 21.7669
-82.6818 21.8211
-79.3822 22.6813
-79.5792 22.8067
-79.6282 22.8052
-79.5979 22.7876
-79.5228 22.7111
-79.3479 22.6377
-79.3496 22.6639
-79.3822 22.6813
-81.2848 19.3625
-81.2965 19.3414
-81.3373 19.3295
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-81.4191 19.3748
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-81.2246 19.3041
-81.1071 19.3052
-81.1305 19.3468
-81.2848 19.3625
-62.7137 17.3533
-62.7946 17.4026
-62.8271 17.3864
-62.8394 17.3653
-62.8405 17.3471
-62.8389 17.3393
-62.7755 17.3028
-62.702 17.286
-62.6565 17.2244
-62.6307 17.24
-62.6405 17.2623
-62.6758 17.2909
-62.7137 17.3533
-60.9337 14.6862
-60.9187 14.7354
-60.9271 14.7552
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-61.0271 14.8262
-61.1274 14.8753
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-61.1411 14.6524
-61.1043 14.6212
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-61.0637 14.4671
-60.8994 14.4738
-60.8621 14.4263
-60.8366 14.4374
-60.8263 14.4945
-60.87 14.6137
-60.8892 14.6445
-60.9337 14.6862
-62.1758 16.8096
-62.1914 16.8044
-62.223 16.7516
-62.2216 16.6995
-62.1542 16.6812
-62.1484 16.7403
-62.1758 16.8096
-63.16 18.1714
-63.0012 18.2218
-62.9796 18.2648
-63.026 18.2697
-63.1533 18.2003
-63.16 18.1714
-61.762 17.5487
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-61.8524 17.7141
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-72.7473 22.3274
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-71.6684 21.8334
-71.8062 21.8521
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-71.7218 21.7902
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-72.9948 21.5616
-73.0627 21.5153
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-72.8515 20.0937
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-72.6389 19.9858
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-72.791 20.0919
-72.8515 20.0937
脚本：（适用于 gnuplot>=5.0.0，2015 年 1 月）
### autoseparation of data describing closed areas
reset session
FILE = "SO65655925.dat"
# function to set color to transparent when coordinate appears again
myColor(colX,colY,color) = \
($0==0 ? (x2=y2=NaN, c=0, x0=column(colX), y0=column(colY)) : 0, \
x1=x2, x2=column(colX), y1=y2, y2=column(colY), \
x1==x0 && y1==y0 ? c=c+1 : 0, c==2 ? (c=0,x0=x2,y0=y2) : 0, \
c==0 && $0!=0 ? 0xff123456 : color )
set multiplot layout 2,1
plot FILE u 1:2 w l lc "black" ti "Data as is"
plot FILE u 1:2:(myColor(1,2,0xff0000)) w l lc rgb var ti 'Data with "autoseparation"'
unset multiplot
### end of script
结果：
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