如何解决为什么点与 Gnuplot 的链接不好？
我不能把我所有的数据都放上来，因为：看起来你的帖子主要是代码；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
如您所见，我将两点联系起来，但我不明白为什么？
你有什么想法吗？
解决方法
在数据的第 6 行之后插入一个空行。这将断开两个岛的连接。
### 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 code
结果：
添加：
只是为了记录，在类似情况下可能对其他人有用的更多解释和代码。 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开？ 您必须告诉 gnuplot 在何处进行中断。但是你怎么知道的？
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后，都会引入一个间隙（空线）。
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。但是，对于最终结果，可能只需“举起笔”而不修改数据即可。使用 gnuplot，您可以玩“把戏”并使这条线透明，例如颜色0xff123456（根据方案0xAARRGGBB）只要以0xff开头即可，即完全透明。
总结：定义一个函数，每次坐标再次出现后，将颜色设置为透明。也许有人甚至可以简化功能。
数据： Island.dat
# x y
-76.3499 18.1519
-76.7007 18.2572
-76.7933 18.3043
-76.9082 18.3904
-76.9594 18.4019
-77.0138 18.4029
-77.1396 18.4215
-77.2615 18.4574
-77.3542 18.4665
-77.4516 18.467
-77.8734 18.5222
-77.9269 18.5007
-77.9782 18.4678
-78.0945 18.4448
-78.2167 18.4481
-78.2524 18.4263
-78.326 18.3498
-78.3395 18.2872
-78.2941 18.2181
-78.0736 18.1912
-78.0445 18.1738
-77.963 18.0476
-77.8813 18.019
-77.8494 17.9875
-77.7682 17.8774
-77.6708 17.8597
-77.4639 17.8561
-77.3614 17.8337
-77.2799 17.7795
-77.205 17.7149
-77.1584 17.8451
-77.1195 17.8801
-77.0713 17.9013
-77.0359 17.8541
-76.9441 17.8488
-76.8962 17.9041
-76.8532 17.9737
-76.7948 17.9763
-76.7483 17.9649
-76.7743 17.9404
-76.6694 17.9276
-76.6254 17.901
-76.5246 17.8662
-76.4155 17.8682
-76.3015 17.8798
-76.2108 17.9135
-76.2328 17.9703
-76.3499 18.1519
-65.6288 18.3814
-65.7556 18.4016
-65.8788 18.4438
-66.0704 18.469
-66.0927 18.469
-66.0684 18.428
-66.0985 18.4252
-66.1294 18.4449
-66.1531 18.4707
-66.1886 18.4758
-66.8129 18.4925
-67.0596 18.5222
-67.113 18.5148
-67.1586 18.4992
-67.1718 18.4358
-67.2134 18.3936
-67.2641 18.3646
-67.239 18.3207
-67.2042 18.2834
-67.1725 18.2242
-67.1743 18.1525
-67.1969 17.9942
-67.1424 17.9667
-67.0133 17.9679
-66.9612 17.9538
-66.9 17.9479
-66.8376 17.9551
-66.7724 17.9866
-66.5984 17.9779
-66.5108 17.987
-66.4085 17.9506
-66.3258 17.9642
-66.2859 17.95
-66.245 17.9473
-66.1355 17.9495
-65.9708 17.9744
-65.8341 18.0573
-65.7822 18.1286
-65.7184 18.1867
-65.6208 18.2423
-65.6288 18.3814
-74.5131 20.3846
-74.6625 20.5221
-74.7321 20.5732
-74.8826 20.6506
-74.9597 20.6727
-75.2133 20.7139
-75.3381 20.7016
-75.5246 20.7167
-75.6428 20.7335
-75.7246 20.7146
-75.753 20.7362
-75.7604 20.7755
-75.7402 20.812
-75.5973 20.8376
-75.6629 20.8981
-75.6385 20.9475
-75.5958 20.9947
-75.6337 21.0613
-75.7229 21.111
-75.899 21.1143
-76.0736 21.1334
-76.2592 21.2274
-76.4552 21.2736
-76.5517 21.2721
-76.6474 21.2845
-76.6885 21.3404
-76.7261 21.3589
-76.765 21.3624
-76.8674 21.3304
-76.8598 21.3648
-76.8363 21.3995
-76.9281 21.459
-77.0986 21.589
-77.141 21.5386
-77.2079 21.4789
-77.2529 21.4835
-77.2696 21.5379
-77.3662 21.6126
-77.2445 21.5938
-77.1813 21.5977
-77.1441 21.6436
-77.2221 21.6724
-77.2995 21.7123
-77.3421 21.7553
-77.4973 21.8716
-77.5832 21.8893
-77.5733 21.8683
-77.5065 21.811
-77.4971 21.7883
-77.5451 21.7746
-77.6368 21.7974
-77.865 21.9006
-77.9705 21.972
-78.1431 22.1094
-78.6865 22.3668
-78.7192 22.3581
-78.776 22.3673
-78.8354 22.3909
-78.9019 22.396
-79.183 22.3879
-79.2757 22.4076
-79.3583 22.4489
-79.4565 22.5099
-79.5492 22.5778
-79.6767 22.7431
-79.8507 22.8272
-79.8203 22.887
-79.9235 22.8691
-79.9599 22.8769
-80.0752 22.9423
-80.1676 22.9494
-80.2662 22.935
-80.3649 22.9434
-80.4592 22.975
-80.5505 23.0166
-80.6134 23.0837
-80.6501 23.1031
-81.0077 23.0898
-81.1446 23.0549
-81.1786 23.0597
-81.2716 23.1286
-81.2624 23.1568
-81.3636 23.1297
-81.5754 23.1165
-81.8375 23.163
-82.1014 23.1904
-82.3505 23.154
-82.5878 23.0646
-82.6658 23.0436
-83.1772 22.983
-83.2578 22.9676
-84.0449 22.666
-84.1218 22.6186
-84.2813 22.4742
-84.3613 22.3789
-84.383 22.2556
-84.3264 22.0743
-84.3731 22.0359
-84.4331 22.0313
-84.4942 22.0416
-84.5328 22.0312
-84.8772 21.8941
-84.8872 21.857
-84.8382 21.8279
-84.7858 21.8423
-84.6827 21.8991
-84.6269 21.9204
-84.56 21.933
-84.5014 21.9303
-84.4909 21.8543
-84.5026 21.7762
-84.4488 21.7917
-84.2407 21.8983
-84.1383 21.929
-84.031 21.9431
-83.998 21.9801
-83.9633 22.0921
-83.9327 22.1497
-83.9007 22.1701
-83.6866 22.1799
-83.6431 22.189
-83.6015 22.2087
-83.544 22.2089
-83.4859 22.1871
-83.3796 22.223
-83.2921 22.3032
-83.1894 22.3554
-83.1437 22.3865
-83.1071 22.4299
-83.0094 22.514
-82.8612 22.5951
-82.7864 22.6583
-82.738 22.6893
-81.9034 22.679
-81.8388 22.6725
-81.7899 22.657
-81.7457 22.6329
-81.7027 22.5919
-81.6833 22.5348
-81.7104 22.4967
-81.7571 22.4667
-81.973 22.4218
-82.0777 22.3877
-81.9726 22.2909
-81.8494 22.2137
-81.8162 22.2002
-81.4411 22.1838
-81.3553 22.1041
-81.2844 22.1094
-81.2224 22.1429
-81.1996 22.2029
-81.1855 22.268
-81.1414 22.2069
-81.1167 22.1342
-81.0831 22.0979
-81.0356 22.0736
-80.9619 22.0529
-80.4991 22.0635
-80.4848 22.0872
-80.4854 22.1234
-80.3929 22.0337
-80.3107 21.9334
-80.2313 21.8722
-80.1383 21.8292
-79.9103 21.7426
-79.3574 21.5852
-79.2744 21.5626
-79.1892 21.5528
-78.8229 21.6189
-78.7277 21.5927
-78.6365 21.5155
-78.5766 21.4138
-78.5373 21.2968
-78.4908 21.0537
-78.4539 21.011
-78.4063 20.9739
-78.3139 20.9275
-78.1164 20.7619
-77.9973 20.7154
-77.8569 20.7136
-77.5927 20.6901
-77.467 20.6895
-77.3476 20.6724
-77.2296 20.6438
-77.2055 20.6108
-77.189 20.56
-77.1079 20.4917
-77.093 20.4529
-77.1038 20.4075
-77.1494 20.3473
-77.2134 20.3004
-77.5538 20.0821
-77.7151 19.8555
-77.4632 19.8614
-77.212 19.8938
-76.9995 19.8928
-76.8902 19.9213
-76.7797 19.9402
-76.5156 19.9567
-76.2528 19.9872
-76.1584 19.9897
-75.7651 19.9604
-75.6572 19.9322
-75.552 19.8911
-75.2905 19.8931
-75.2194 19.9236
-75.1773 19.9594
-75.1516 20.0083
-75.122 19.9539
-75.1241 19.9247
-75.1164 19.9014
-75.0032 19.9286
-74.9551 19.9579
-74.85 20.0023
-74.6348 20.0582
-74.4122 20.0753
-74.2528 20.0797
-74.2174 20.1171
-74.1537 20.1686
-74.1368 20.2319
-74.1675 20.2922
-74.1985 20.3115
-74.2339 20.3264
-74.2728 20.3174
-74.3844 20.3305
-74.5131 20.3846
-68.6848 18.9048
-68.9014 18.9885
-69.0313 19.0132
-69.163 19.0285
-69.2802 19.0519
-69.3953 19.0861
-69.5083 19.1076
-69.6236 19.1178
-69.6232 19.1605
-69.606 19.2065
-69.5197 19.212
-69.3228 19.2011
-69.2643 19.2257
-69.2325 19.2718
-69.325 19.3277
-69.7394 19.2992
-69.8234 19.3671
-69.8783 19.4733
-69.8912 19.5897
-69.9568 19.6719
-70.0141 19.6729
-70.1294 19.6361
-70.1938 19.638
-70.3047 19.6761
-70.4364 19.7712
-70.4793 19.777
-70.6362 19.7756
-70.6859 19.7933
-70.7853 19.8509
-70.8339 19.8873
-70.9542 19.914
-71.0819 19.8905
-71.2359 19.8481
-71.2813 19.8474
-71.4417 19.894
-71.5578 19.8954
-71.616 19.8774
-71.6674 19.8486
-71.7061 19.7952
-71.7351 19.7351
-71.7792 19.7182
-71.8347 19.6967
-71.9543 19.7217
-72.2198 19.7446
-72.4299 19.8133
-72.637 19.9009
-72.8765 19.9281
-73.1178 19.9038
-73.2178 19.8837
-73.3153 19.8546
-73.4005 19.8074
-73.4384 19.7221
-73.3963 19.6587
-73.3155 19.6373
-73.0527 19.6107
-72.8634 19.5261
-72.7032 19.4411
-72.7418 19.3418
-72.768 19.2406
-72.7412 19.1313
-72.8111 19.0716
-72.6491 18.8941
-72.4652 18.7436
-72.3477 18.675
-72.3467 18.6237
-72.3761 18.5745
-72.4181 18.5587
-72.6181 18.5508
-72.6598 18.5153
-72.696 18.4682
-72.7395 18.4421
-72.7894 18.4348
-72.9173 18.4557
-73.5916 18.5224
-73.687 18.5653
-73.8625 18.5754
-73.976 18.6014
-74.1003 18.6411
-74.2277 18.6627
-74.2845 18.6567
-74.3875 18.6247
-74.4781 18.45
-74.46 18.3931
-74.419 18.3462
-74.1946 18.2692
-74.0854 18.2151
-73.9895 18.1432
-73.885 18.0419
-73.8392 18.0582
-73.8247 18.1218
-73.7473 18.1902
-73.644 18.2291
-73.5148 18.2454
-73.3852 18.2512
-73.2723 18.2335
-73.1601 18.2056
-72.8767 18.1518
-72.7553 18.1562
-72.6333 18.1762
-72.5919 18.1869
-72.5532 18.2084
-72.5036 18.2199
-72.0599 18.2286
-72.0021 18.212
-71.9461 18.1861
-71.8529 18.1191
-71.7683 18.0392
-71.7125 18.0055
-71.6737 17.9541
-71.6572 17.8887
-71.6583 17.8211
-71.6317 17.7736
-71.569 17.7574
-71.5184 17.725
-71.439 17.6356
-71.3957 17.6461
-71.3583 17.6941
-71.2673 17.8496
-71.106 18.07
-71.0826 18.1284
-71.0822 18.2244
-71.07 18.2503
-71.0278 18.2732
-70.9243 18.2925
-70.7588 18.3456
-70.6447 18.3362
-70.5654 18.2676
-70.4799 18.2173
-70.1831 18.2518
-70.1416 18.2771
-70.0633 18.3457
-70.0183 18.3736
-69.8964 18.4177
-69.7707 18.4436
-69.6447 18.4364
-69.5194 18.4157
-69.397 18.4201
-69.2745 18.4398
-69.0723 18.3992
-68.935 18.408
-68.8195 18.3393
-68.7785 18.2661
-68.721 18.2184
-68.6874 18.2149
-68.6588 18.222
-68.6122 18.3062
-68.5638 18.3555
-68.4932 18.379
-68.4448 18.4177
-68.3593 18.5381
-68.3392 18.6115
-68.3814 18.6711
-68.4454 18.7145
-68.6848 18.9048
-64.845 18.3301
-64.8891 18.3742
-64.942 18.3852
-65.0236 18.3676
-64.92 18.3213
-64.845 18.3301
-73.1706 18.9673
-73.2764 18.9541
-73.2853 18.8967
-73.078 18.7909
-72.8222 18.7071
-72.8046 18.7777
-72.9192 18.8615
-73.0691 18.932
-73.1706 18.9673
-63.115 18.0907
-63.1247 18.0643
-63.0904 18.0414
-63.023 18.0192
-63.0123 18.0454
-63.0094 18.1043
-63.0248 18.1131
-63.0631 18.1153
-63.115 18.0907
-65.5722 18.1373
-65.5551 18.1077
-65.504 18.0995
-65.4256 18.1056
-65.2949 18.1333
-65.3027 18.1444
-65.3662 18.1611
-65.4771 18.165
-65.5722 18.1373
-62.6249 17.1296
-62.5824 17.1006
-62.5322 17.1219
-62.5342 17.1701
-62.5747 17.201
-62.6153 17.1991
-62.6249 17.1296
-64.4261 18.5131
-64.4437 18.4734
-64.438 18.459
-64.4211 18.4574
-64.3952 18.4646
-64.3247 18.5175
-64.4261 18.5131
-64.7877 18.3411
-64.7706 18.3316
-64.726 18.3279
-64.6598 18.3543
-64.7524 18.372
-64.7877 18.3411
-64.651 18.4425
-64.6951 18.4117
-64.6718 18.3991
-64.5937 18.4028
-64.5452 18.4381
-64.5691 18.4463
-64.651 18.4425
-64.8891 17.7017
-64.6863 17.7061
-64.5805 17.7502
-64.6818 17.7502
-64.7656 17.7943
-64.8847 17.7723
-64.8891 17.7017
-77.7744 22.083
-77.8547 22.0919
-77.9186 22.0881
-77.9 22.0372
-77.8232 21.9879
-77.7836 21.9704
-77.755 21.9656
-77.7101 21.9213
-77.669 21.952
-77.646 21.9965
-77.6337 22.054
-77.7744 22.083
-78.0271 22.2852
-78.0617 22.3059
-78.0941 22.3872
-78.1506 22.4315
-78.201 22.4376
-78.2735 22.4236
-78.27 22.4022
-78.2261 22.38
-78.18 22.322
-78.1017 22.3058
-78.0475 22.2685
-78.0271 22.2852
-78.2839 22.4555
-78.3512 22.5386
-78.3996 22.5475
-78.4453 22.5437
-78.4929 22.5311
-78.6301 22.5522
-78.6955 22.534
-78.6736 22.5088
-78.629 22.4882
-78.5477 22.464
-78.4246 22.4601
-78.3899 22.4451
-78.343 22.4451
-78.2839 22.4555
-74.2422 22.7151
-74.0986 22.6654
-74.0348 22.7056
-74.0575 22.7235
-74.1754 22.7599
-74.2215 22.8116
-74.307 22.8396
-74.314 22.8036
-74.3031 22.7645
-74.2746 22.7117
-74.2422 22.7151
-73.661 20.9374
-73.4008 20.9439
-73.1646 20.9792
-73.0587 21.119
-73.0269 21.1924
-73.0117 21.2995
-73.0585 21.3134
-73.1373 21.2048
-73.2354 21.1545
-73.3016 21.1562
-73.4245 21.2018
-73.5231 21.1908
-73.5851 21.1259
-73.6804 21.1033
-73.6696 21.0822
-73.6678 21.0616
-73.6868 21.0091
-73.6812 20.9756
-73.661 20.9374
-73.9146 22.568
-73.9064 22.5274
-73.936 22.4777
-73.995 22.4492
-74.0101 22.428
-74.0523 22.4006
-74.1268 22.3234
-74.2613 22.2355
-74.2769 22.1837
-74.2067 22.2138
-74.0929 22.3062
-73.9746 22.3612
-73.8365 22.5384
-73.8775 22.6808
-73.85 22.7311
-73.9542 22.7155
-73.9755 22.6823
-73.9764 22.6351
-73.9146 22.568
-75.9486 23.6474
-76.0104 23.6714
-76.0371 23.6028
-75.956 23.5923
-75.781 23.4707
-75.7063 23.4442
-75.6646 23.4501
-75.7542 23.49
-75.8075 23.5425
-75.9486 23.6474
-75.1306 23.2679
-75.1411 23.2046
-75.2044 23.1927
-75.2233 23.1653
-75.1321 23.1171
-74.9733 23.0686
-74.8469 22.8687
-74.8405 22.8943
-74.8456 22.9999
-74.9371 23.0881
-75.0642 23.1502
-75.1088 23.3328
-75.1753 23.4387
-75.2166 23.5468
-75.316 23.6684
-75.3098 23.5898
-75.2882 23.5683
-75.2413 23.4746
-75.1576 23.3364
-75.1306 23.2679
-77.8794 22.1275
-77.8425 22.149
-77.8891 22.2011
-77.8937 22.2146
-77.9696 22.2407
-77.9856 22.3021
-77.9992 22.2987
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代码：
### autoseparation of data describing closed areas
reset session
# 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 )
FILE = 'Islands.dat'
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 code
结果：
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