为什么线点绘制样式缺少线？

Question

我正在尝试从3个数据文件中绘制3个图表，这些数据是我从CPP代码中产生的。这3个图分别是摆的位置，速度和加速度。这是我的代码：

set key font ",16"
set title "Evolution d'un pendule en fonction du temps"
plot for [i=2:4] 'data/pendulum.md' u 1:i w linesp title "θ(t) " . (i-2)

但是出于某种原因linesp不会产生线，只有点。我尝试了较少的积分，但仍然不起作用。现在，使用其他功能和模拟，linesp正常工作。也许[i = 2：4]可以防止GNUPLOT产生线条。我不知道我的莱特利，欢迎任何帮助。这是我的图形和数据：

0.01000 0.39809 -0.19101 -18.77588 #t θ θdot θddot

0.02000 0.39430 -0.37877 -18.36979 #t θ θdot θddot

0.03000 0.38868 -0.56247 -17.88515 #t θ θdot θddot

0.04000 0.38126 -0.74132 -17.32458 #t θ θdot θddot

0.05000 0.37212 -0.91456 -16.69088 #t θ θdot θddot

0.06000 0.36130 -1.08147 -15.98706 #t θ θdot θddot

0.07000 0.34889 -1.24134 -15.21633 #t θ θdot θddot

0.08000 0.33496 -1.39351 -14.38218 #t θ θdot θddot

0.09000 0.31958 -1.53733 -13.48838 #t θ θdot θddot

0.10000 0.30286 -1.67221 -12.53896 #t θ θdot θddot

0.11000 0.28488 -1.79760 -11.53832 #t θ θdot θddot

0.12000 0.26575 -1.91298 -10.49112 #t θ θdot θddot

0.13000 0.24558 -2.01790 -9.40239 #t θ θdot θddot

0.14000 0.22446 -2.11192 -8.27746 #t θ θdot θddot

0.15000 0.20251 -2.19469 -7.12195 #t θ θdot θddot

0.16000 0.17985 -2.26591 -5.94177 #t θ θdot θddot

0.17000 0.15660 -2.32533 -4.74305 #t θ θdot θddot

0.18000 0.13287 -2.37276 -3.53212 #t θ θdot θddot

0.19000 0.10879 -2.40808 -2.31544 #t θ θdot θddot

0.20000 0.08448 -2.43124 -1.09957 #t θ θdot θddot

0.21000 0.06005 -2.44223 0.10894 #t θ θdot θddot

0.22000 0.03564 -2.44114 1.30356 #t θ θdot θddot

0.23000 0.01136 -2.42811 2.47789 #t θ θdot θddot

0.24000 -0.01267 -2.40333 3.62572 #t θ θdot θddot

0.25000 -0.03634 -2.36707 4.74107 #t θ θdot θddot

0.26000 -0.05954 -2.31966 5.81827 #t θ θdot θddot

0.27000 -0.08215 -2.26148 6.85199 #t θ θdot θddot

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0.29000 -0.12523 -2.11459 8.76972 #t θ θdot θddot

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0.35000 -0.23084 -1.46963 13.05957 #t θ θdot θddot

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0.38000 -0.26691 -1.06431 14.26756 #t θ θdot θddot

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0.40000 -0.28389 -0.77639 14.70914 #t θ θdot θddot

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1.00000 0.17359 -0.93268 -7.30625 #t θ θdot θddot

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1.07000 0.09125 -1.31476 -2.82612 #t θ θdot θddot

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1.09000 0.06418 -1.36437 -1.44019 #t θ θdot θddot

1.10000 0.05039 -1.37877 -0.74701 #t θ θdot θddot

1.11000 0.03653 -1.38624 -0.05837 #t θ θdot θddot

1.12000 0.02266 -1.38682 0.62229 #t θ θdot θddot

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2.00000 0.02787 -0.78420 -0.38672 #t θ θdot θddot

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2.94000 -0.00279 -0.44034 0.68739 #t θ θdot θddot

2.95000 -0.00713 -0.43347 0.89141 #t θ θdot θddot

2.96000 -0.01137 -0.42456 1.08851 #t θ θdot θddot

2.97000 -0.01551 -0.41367 1.27779 #t θ θdot θddot

2.98000 -0.01952 -0.40089 1.45842 #t θ θdot θddot

2.99000 -0.02338 -0.38631 1.62963 #t θ θdot θddot

3.00000 -0.02708 -0.37001 1.79070 #t θ θdot θddot

3.01000 -0.03060 -0.35211 1.94095 #t θ θdot θddot

3.02000 -0.03393 -0.33270 2.07979 #t θ θdot θddot

3.03000 -0.03705 -0.31190 2.20668 #t θ θdot θddot

3.04000 -0.03995 -0.28983 2.32116 #t θ θdot θddot

3.05000 -0.04261 -0.26662 2.42281 #t θ θdot θddot

3.06000 -0.04504 -0.24239 2.51130 #t θ θdot θddot

3.07000 -0.04721 -0.21728 2.58637 #t θ θdot θddot

3.08000 -0.04912 -0.19141 2.64782 #t θ θdot θddot

3.09000 -0.05077 -0.16494 2.69552 #t θ θdot θddot

3.10000 -0.05215 -0.13798 2.72942 #t θ θdot θddot

3.11000 -0.05326 -0.11069 2.74952 #t θ θdot θddot

3.12000 -0.05409 -0.08319 2.75590 #t θ θdot θddot

3.13000 -0.05465 -0.05563 2.74870 #t θ θdot θddot

3.14000 -0.05493 -0.02815 2.72812 #t θ θdot θddot

3.15000 -0.05494 -0.00086 2.69444 #t θ θdot θddot

3.16000 -0.05468 0.02608 2.64799 #t θ θdot θddot

3.17000 -0.05415 0.05256 2.58915 #t θ θdot θddot

3.18000 -0.05337 0.07845 2.51836 #t θ θdot θddot

3.19000 -0.05233 0.10363 2.43612 #t θ θdot θddot

3.20000 -0.05105 0.12800 2.34297 #t θ θdot θddot

3.21000 -0.04954 0.15143 2.23950 #t θ θdot θddot

3.22000 -0.04780 0.17382 2.12635 #t θ θdot θddot

3.23000 -0.04585 0.19508 2.00419 #t θ θdot θddot

3.24000 -0.04370 0.21513 1.87372 #t θ θdot θddot

3.25000 -0.04136 0.23386 1.73569 #t θ θdot θddot

3.26000 -0.03885 0.25122 1.59087 #t θ θdot θddot

3.27000 -0.03617 0.26713 1.44005 #t θ θdot θddot

3.28000 -0.03336 0.28153 1.28405 #t θ θdot θddot

3.29000 -0.03042 0.29437 1.12368 #t θ θdot θddot

3.30000 -0.02736 0.30561 0.95980 #t θ θdot θddot

3.31000 -0.02421 0.31520 0.79324 #t θ θdot θddot

3.32000 -0.02098 0.32314 0.62487 #t θ θdot θddot

3.33000 -0.01768 0.32939 0.45553 #t θ θdot θddot

3.34000 -0.01434 0.33394 0.28605 #t θ θdot θddot

3.35000 -0.01097 0.33680 0.11729 #t θ θdot θddot

3.36000 -0.00759 0.33797 -0.04994 #t θ θdot θddot

3.37000 -0.00422 0.33747 -0.21485 #t θ θdot θddot

3.38000 -0.00087 0.33533 -0.37664 #t θ θdot θddot

3.39000 0.00245 0.33156 -0.53456 #t θ θdot θddot

3.40000 0.00571 0.32621 -0.68789 #t θ θdot θddot

3.41000 0.00890 0.31934 -0.83592 #t θ θdot θddot

3.42000 0.01201 0.31098 -0.97799 #t θ θdot θddot

3.43000 0.01503 0.30120 -1.11349 #t θ θdot θddot

3.44000 0.01793 0.29006 -1.24183 #t θ θdot θddot

3.45000 0.02070 0.27764 -1.36247 #t θ θdot θddot

3.46000 0.02334 0.26402 -1.47490 #t θ θdot θddot

3.47000 0.02584 0.24927 -1.57870 #t θ θdot θddot

3.48000 0.02817 0.23348 -1.67345 #t θ θdot θddot

3.49000 0.03034 0.21675 -1.75880 #t θ θdot θddot

3.50000 0.03233 0.19916 -1.83445 #t θ θdot θddot

3.51000 0.03414 0.18082 -1.90016 #t θ θdot θddot

3.52000 0.03576 0.16181 -1.95573 #t θ θdot θddot

3.53000 0.03718 0.14226 -2.00101 #t θ θdot θddot

3.54000 0.03840 0.12225 -2.03592 #t θ θdot θddot

3.55000 0.03942 0.10189 -2.06041 #t θ θdot θddot

3.56000 0.04023 0.08128 -2.07449 #t θ θdot θddot

3.57000 0.04084 0.06054 -2.07823 #t θ θdot θddot

3.58000 0.04124 0.03976 -2.07174 #t θ θdot θddot

3.59000 0.04143 0.01904 -2.05517 #t θ θdot θddot

3.60000 0.04141 -0.00151 -2.02874 #t θ θdot θddot

3.61000 0.04119 -0.02180 -1.99270 #t θ θdot θddot

3.62000 0.04078 -0.04173 -1.94734 #t θ θdot θddot

3.63000 0.04016 -0.06120 -1.89300 #t θ θdot θddot

3.64000 0.03936 -0.08013 -1.83007 #t θ θdot θddot

3.65000 0.03838 -0.09843 -1.75895 #t θ θdot θddot

3.66000 0.03722 -0.11602 -1.68009 #t θ θdot θddot

3.67000 0.03589 -0.13282 -1.59398 #t θ θdot θddot

3.68000 0.03440 -0.14876 -1.50114 #t θ θdot θddot

3.69000 0.03276 -0.16377 -1.40209 #t θ θdot θddot

3.70000 0.03099 -0.17779 -1.29740 #t θ θdot θddot

3.71000 0.02908 -0.19077 -1.18765 #t θ θdot θddot

3.72000 0.02705 -0.20264 -1.07345 #t θ θdot θddot

3.73000 0.02492 -0.21338 -0.95540 #t θ θdot θddot

3.74000 0.02269 -0.22293 -0.83414 #t θ θdot θddot

3.75000 0.02038 -0.23127 -0.71030 #t θ θdot θddot

3.76000 0.01799 -0.23838 -0.58452 #t θ θdot θddot

3.77000 0.01555 -0.24422 -0.45744 #t θ θdot θddot

3.78000 0.01306 -0.24880 -0.32970 #t θ θdot θddot

3.79000 0.01054 -0.25209 -0.20193 #t θ θdot θddot

3.80000 0.00800 -0.25411 -0.07477 #t θ θdot θddot

3.81000 0.00545 -0.25486 0.05117 #t θ θdot θddot

3.82000 0.00291 -0.25435 0.17529 #t θ θdot θddot

3.83000 0.00038 -0.25260 0.29699 #t θ θdot θddot

3.84000 -0.00211 -0.24963 0.41572 #t θ θdot θddot

3.85000 -0.00457 -0.24547 0.53093 #t θ θdot θddot

3.86000 -0.00697 -0.24016 0.64209 #t θ θdot θddot

3.87000 -0.00931 -0.23374 0.74871 #t θ θdot θddot

3.88000 -0.01157 -0.22625 0.85032 #t θ θdot θddot

3.89000 -0.01375 -0.21775 0.94649 #t θ θdot θddot

3.90000 -0.01583 -0.20828 1.03681 #t θ θdot θddot

3.91000 -0.01781 -0.19792 1.12091 #t θ θdot θddot

3.92000 -0.01968 -0.18671 1.19846 #t θ θdot θddot

3.93000 -0.02142 -0.17472 1.26917 #t θ θdot θddot

3.94000 -0.02304 -0.16203 1.33276 #t θ θdot θddot

3.95000 -0.02453 -0.14870 1.38902 #t θ θdot θddot

3.96000 -0.02588 -0.13481 1.43776 #t θ θdot θddot

3.97000 -0.02708 -0.12044 1.47884 #t θ θdot θddot

3.98000 -0.02814 -0.10565 1.51215 #t θ θdot θddot

3.99000 -0.02905 -0.09053 1.53764 #t θ θdot θddot

4.00000 -0.02980 -0.07515 1.55526 #t θ θdot θddot

4.01000 -0.03039 -0.05960 1.56504 #t θ θdot θddot

4.02000 -0.03083 -0.04395 1.56702 #t θ θdot θddot

4.03000 -0.03112 -0.02828 1.56130 #t θ θdot θddot

4.04000 -0.03124 -0.01266 1.54799 #t θ θdot θddot

4.05000 -0.03121 0.00282 1.52726 #t θ θdot θddot

4.06000 -0.03103 0.01809 1.49930 #t θ θdot θddot

4.07000 -0.03070 0.03308 1.46434 #t θ θdot θddot

4.08000 -0.03022 0.04773 1.42263 #t θ θdot θddot

4.09000 -0.02961 0.06195 1.37448 #t θ θdot θddot

4.10000 -0.02885 0.07570 1.32018 #t θ θdot θddot

4.11000 -0.02796 0.08890 1.26009 #t θ θdot θddot

4.12000 -0.02694 0.10150 1.19457 #t θ θdot θddot

4.13000 -0.02581 0.11345 1.12402 #t θ θdot θddot

4.14000 -0.02456 0.12469 1.04883 #t θ θdot θddot

4.15000 -0.02321 0.13517 0.96943 #t θ θdot θddot

4.16000 -0.02176 0.14487 0.88628 #t θ θdot θddot

4.17000 -0.02023 0.15373 0.79981 #t θ θdot θddot

4.18000 -0.01861 0.16173 0.71050 #t θ θdot θddot

4.19000 -0.01692 0.16883 0.61882 #t θ θdot θddot

4.20000 -0.01517 0.17502 0.52524 #t θ θdot θddot

4.21000 -0.01337 0.18027 0.43026 #t θ θdot θddot

4.22000 -0.01152 0.18458 0.33436 #t θ θdot θddot

4.23000 -0.00964 0.18792 0.23801 #t θ θdot θddot

4.24000 -0.00774 0.19030 0.14169 #t θ θdot θddot

4.25000 -0.00582 0.19172 0.04588 #t θ θdot θddot

4.26000 -0.00390 0.19218 -0.04895 #t θ θdot θddot

4.27000 -0.00198 0.19169 -0.14236 #t θ θdot θddot

4.28000 -0.00008 0.19026 -0.23391 #t θ θdot θddot

4.29000 0.00180 0.18792 -0.32316 #t θ θdot θddot

4.30000 0.00365 0.18469 -0.40971 #t θ θdot θddot

4.31000 0.00545 0.18060 -0.49317 #t θ θdot θddot

4.32000 0.00721 0.17566 -0.57317 #t θ θdot θddot

4.33000 0.00891 0.16993 -0.64935 #t θ θdot θddot

4.34000 0.01054 0.16344 -0.72140 #t θ θdot θddot

4.35000 0.01210 0.15623 -0.78900 #t θ θdot θddot

4.36000 0.01359 0.14834 -0.85189 #t θ θdot θddot

4.37000 0.01499 0.13982 -0.90982 #t θ θdot θddot

4.38000 0.01629 0.13072 -0.96256 #t θ θdot θddot

4.39000 0.01750 0.12109 -1.00991 #t θ θdot θddot

4.40000 0.01861 0.11099 -1.05172 #t θ θdot θddot

4.41000 0.01962 0.10048 -1.08785 #t θ θdot θddot

4.42000 0.02052 0.08960 -1.11819 #t θ θdot θddot

4.43000 0.02130 0.07842 -1.14267 #t θ θdot θddot

4.44000 0.02197 0.06699 -1.16123 #t θ θdot θddot

4.45000 0.02252 0.05538 -1.17387 #t θ θdot θddot

4.46000 0.02296 0.04364 -1.18060 #t θ θdot θddot

4.47000 0.02328 0.03183 -1.18145 #t θ θdot θddot

4.48000 0.02348 0.02002 -1.17650 #t θ θdot θddot

4.49000 0.02356 0.00825 -1.16584 #t θ θdot θddot

4.50000 0.02353 -0.00341 -1.14960 #t θ θdot θddot

4.51000 0.02338 -0.01490 -1.12792 #t θ θdot θddot

4.52000 0.02312 -0.02618 -1.10098 #t θ θdot θddot

4.53000 0.02274 -0.03719 -1.06898 #t θ θdot θddot

4.54000 0.02226 -0.04788 -1.03214 #t θ θdot θddot

4.55000 0.02168 -0.05820 -0.99070 #t θ θdot θddot

4.56000 0.02100 -0.06811 -0.94491 #t θ θdot θddot

4.57000 0.02023 -0.07756 -0.89507 #t θ θdot θddot

4.58000 0.01936 -0.08651 -0.84146 #t θ θdot θddot

4.59000 0.01841 -0.09492 -0.78439 #t θ θdot θddot

4.60000 0.01738 -0.10277 -0.72418 #t θ θdot θddot

4.61000 0.01628 -0.11001 -0.66118 #t θ θdot θddot

4.62000 0.01512 -0.11662 -0.59572 #t θ θdot θddot

4.63000 0.01389 -0.12258 -0.52815 #t θ θdot θddot

4.64000 0.01261 -0.12786 -0.45884 #t θ θdot θddot

4.65000 0.01129 -0.13245 -0.38814 #t θ θdot θddot

4.66000 0.00993 -0.13633 -0.31643 #t θ θdot θddot

4.67000 0.00853 -0.13949 -0.24405 #t θ θdot θddot

4.68000 0.00711 -0.14193 -0.17139 #t θ θdot θddot

4.69000 0.00567 -0.14365 -0.09879 #t θ θdot θddot

4.70000 0.00423 -0.14464 -0.02661 #t θ θdot θddot

4.71000 0.00278 -0.14490 0.04480 #t θ θdot θddot

4.72000 0.00133 -0.14445 0.11509 #t θ θdot θddot

4.73000 -0.00010 -0.14330 0.18395 #t θ θdot θddot

4.74000 -0.00151 -0.14146 0.25103 #t θ θdot θddot

4.75000 -0.00290 -0.13895 0.31605 #t θ θdot θddot

4.76000 -0.00426 -0.13579 0.37871 #t θ θdot θddot

4.77000 -0.00558 -0.13201 0.43872 #t θ θdot θddot

4.78000 -0.00686 -0.12762 0.49583 #t θ θdot θddot

4.79000 -0.00808 -0.12266 0.54980 #t θ θdot θddot

4.80000 -0.00925 -0.11716 0.60039 #t θ θdot θddot

4.81000 -0.01037 -0.11116 0.64741 #t θ θdot θddot

4.82000 -0.01141 -0.10468 0.69066 #t θ θdot θddot

4.83000 -0.01239 -0.09778 0.72998 #t θ θdot θddot

4.84000 -0.01330 -0.09048 0.76523 #t θ θdot θddot

4.85000 -0.01412 -0.08283 0.79629 #t θ θdot θddot

4.86000 -0.01487 -0.07486 0.82305 #t θ θdot θddot

4.87000 -0.01554 -0.06663 0.84544 #t θ θdot θddot

4.88000 -0.01612 -0.05818 0.86341 #t θ θdot θddot

4.89000 -0.01662 -0.04954 0.87691 #t θ θdot θddot

4.90000 -0.01702 -0.04077 0.88595 #t θ θdot θddot

4.91000 -0.01734 -0.03191 0.89053 #t θ θdot θddot

4.92000 -0.01757 -0.02301 0.89068 #t θ θdot θddot

4.93000 -0.01771 -0.01410 0.88646 #t θ θdot θddot

4.94000 -0.01777 -0.00524 0.87795 #t θ θdot θddot

4.95000 -0.01773 0.00354 0.86524 #t θ θdot θddot

4.96000 -0.01761 0.01219 0.84844 #t θ θdot θddot

4.97000 -0.01740 0.02068 0.82770 #t θ θdot θddot

4.98000 -0.01711 0.02896 0.80315 #t θ θdot θddot

4.99000 -0.01674 0.03699 0.77497 #t θ θdot θddot

Answer 1

1. 首选的方法是删除CPP输出创建的空线。

2. 但是，如果您不能或不想更改数据，则简称仅GNUPLOT解决方案：

脚本：

### remove empty lines via gnuplot
reset session

FILE = 'data/pendulum.md'

set table $Data
    set datafile separator "\n"         # read lines as a whole
    plot FILE u (strcol(1)) w table
    set datafile separator whitespace   # restore separator
unset table

plot for [i=2:4] $Data u 1:i w linesp title "θ(t) " . (i-2)
### end of script

结果：（取决于图的大小线几乎看不见）