gnuplot 的极坐标图不好
Bad polar plot with gnuplot
让我们考虑以下 gnuplot 代码：
set term pdf
set output 'wrong.pdf'
set size ratio 1
set tmargin at screen 0.92
set bmargin at screen 0.08
set style line 11 linewidth 1 linecolor rgb 'gray80'
set polar
set angle degree
unset grid
set grid polar 45
# START ----------------------
r = 10000
set rrange [0:r]
set rtics 2000 format '' scale 0
# END ------------------------
unset border
unset xtics
unset ytics
set ytics axis nomirror scale 0 offset 0.3 2000,2000,10000
unset raxis
FILE = "FILE_matrix.dat"
plot FILE using 1:2 with lines lw 3 lc rgb "red" notitle
文件'FILE_matrix.dat'所在的位置（抱歉，它很长）
0.0000000e+00 4.0447050e+03
1.0000000e+00 4.3570910e+03
2.0000000e+00 4.6628463e+03
3.0000000e+00 4.9602826e+03
4.0000000e+00 5.2477346e+03
5.0000000e+00 5.5235684e+03
6.0000000e+00 5.7861896e+03
7.0000000e+00 6.0340515e+03
8.0000000e+00 6.2656631e+03
9.0000000e+00 6.4795963e+03
1.0000000e+01 6.6744937e+03
1.1000000e+01 6.8490752e+03
1.2000000e+01 7.0021450e+03
1.3000000e+01 7.1325975e+03
1.4000000e+01 7.2394233e+03
1.5000000e+01 7.3217146e+03
1.6000000e+01 7.3786700e+03
1.7000000e+01 7.4095991e+03
1.8000000e+01 7.4139260e+03
1.9000000e+01 7.3911929e+03
2.0000000e+01 7.3410629e+03
2.1000000e+01 7.2633220e+03
2.2000000e+01 7.1578807e+03
2.3000000e+01 7.0247752e+03
2.4000000e+01 6.8641677e+03
2.5000000e+01 6.6763462e+03
2.6000000e+01 6.4617236e+03
2.7000000e+01 6.2208365e+03
2.8000000e+01 5.9543430e+03
2.9000000e+01 5.6630203e+03
3.0000000e+01 5.3477615e+03
3.1000000e+01 5.0095718e+03
3.2000000e+01 4.6495644e+03
3.3000000e+01 4.2689555e+03
3.4000000e+01 3.8690592e+03
3.5000000e+01 3.4512819e+03
3.6000000e+01 3.0171157e+03
3.7000000e+01 2.5681321e+03
3.8000000e+01 2.1059751e+03
3.9000000e+01 1.6323535e+03
4.0000000e+01 1.1490335e+03
4.1000000e+01 6.5783052e+02
4.2000000e+01 1.6060141e+02
4.3000000e+01 -3.4076432e+02
4.4000000e+01 -8.4435291e+02
4.5000000e+01 -1.3482350e+03
4.6000000e+01 -1.8504745e+03
4.7000000e+01 -2.3491372e+03
4.8000000e+01 -2.8422999e+03
4.9000000e+01 -3.3280587e+03
5.0000000e+01 -3.8045381e+03
5.1000000e+01 -4.2698992e+03
5.2000000e+01 -4.7223485e+03
5.3000000e+01 -5.1601455e+03
5.4000000e+01 -5.5816110e+03
5.5000000e+01 -5.9851348e+03
5.6000000e+01 -6.3691827e+03
5.7000000e+01 -6.7323034e+03
5.8000000e+01 -7.0731356e+03
5.9000000e+01 -7.3904135e+03
6.0000000e+01 -7.6829730e+03
6.1000000e+01 -7.9497565e+03
6.2000000e+01 -8.1898179e+03
6.3000000e+01 -8.4023265e+03
6.4000000e+01 -8.5865710e+03
6.5000000e+01 -8.7419621e+03
6.6000000e+01 -8.8680355e+03
6.7000000e+01 -8.9644534e+03
6.8000000e+01 -9.0310061e+03
6.9000000e+01 -9.0676126e+03
7.0000000e+01 -9.0743204e+03
7.1000000e+01 -9.0513056e+03
7.2000000e+01 -8.9988713e+03
7.3000000e+01 -8.9174460e+03
7.4000000e+01 -8.8075814e+03
7.5000000e+01 -8.6699496e+03
7.6000000e+01 -8.5053392e+03
7.7000000e+01 -8.3146521e+03
7.8000000e+01 -8.0988982e+03
7.9000000e+01 -7.8591907e+03
8.0000000e+01 -7.5967407e+03
8.1000000e+01 -7.3128514e+03
8.2000000e+01 -7.0089110e+03
8.3000000e+01 -6.6863867e+03
8.4000000e+01 -6.3468172e+03
8.5000000e+01 -5.9918055e+03
8.6000000e+01 -5.6230107e+03
8.7000000e+01 -5.2421405e+03
8.8000000e+01 -4.8509425e+03
8.9000000e+01 -4.4511964e+03
9.0000000e+01 -4.0447050e+03
9.1000000e+01 -3.6332858e+03
9.2000000e+01 -3.2187621e+03
9.3000000e+01 -2.8029549e+03
9.4000000e+01 -2.3876737e+03
9.5000000e+01 -1.9747082e+03
9.6000000e+01 -1.5658198e+03
9.7000000e+01 -1.1627333e+03
9.8000000e+01 -7.6712907e+02
9.9000000e+01 -3.8063477e+02
1.0000000e+02 -4.8181781e+00
1.0100000e+02 3.5882028e+02
1.0200000e+02 7.0885436e+02
1.0300000e+02 1.0439385e+03
1.0400000e+02 1.3628141e+03
1.0500000e+02 1.6643150e+03
1.0600000e+02 1.9473726e+03
1.0700000e+02 2.2110211e+03
1.0800000e+02 2.4544011e+03
1.0900000e+02 2.6767635e+03
1.1000000e+02 2.8774728e+03
1.1100000e+02 3.0560094e+03
1.1200000e+02 3.2119715e+03
1.1300000e+02 3.3450770e+03
1.1400000e+02 3.4551636e+03
1.1500000e+02 3.5421895e+03
1.1600000e+02 3.6062328e+03
1.1700000e+02 3.6474906e+03
1.1800000e+02 3.6662772e+03
1.1900000e+02 3.6630223e+03
1.2000000e+02 3.6382680e+03
1.2100000e+02 3.5926655e+03
1.2200000e+02 3.5269716e+03
1.2300000e+02 3.4420439e+03
1.2400000e+02 3.3388363e+03
1.2500000e+02 3.2183937e+03
1.2600000e+02 3.0818459e+03
1.2700000e+02 2.9304019e+03
1.2800000e+02 2.7653431e+03
1.2900000e+02 2.5880163e+03
1.3000000e+02 2.3998267e+03
1.3100000e+02 2.2022304e+03
1.3200000e+02 1.9967263e+03
1.3300000e+02 1.7848485e+03
1.3400000e+02 1.5681582e+03
1.3500000e+02 1.3482350e+03
1.3600000e+02 1.1266692e+03
1.3700000e+02 9.0505304e+02
1.3800000e+02 6.8497219e+02
1.3900000e+02 4.6799776e+02
1.4000000e+02 2.5567784e+02
1.4100000e+02 4.9529389e+01
1.4200000e+02 -1.4896973e+02
1.4300000e+02 -3.3838854e+02
1.4400000e+02 -5.1735049e+02
1.4500000e+02 -6.8454068e+02
1.4600000e+02 -8.3871285e+02
1.4700000e+02 -9.7869597e+02
1.4800000e+02 -1.1034004e+03
1.4900000e+02 -1.2118238e+03
1.5000000e+02 -1.3030565e+03
1.5100000e+02 -1.3762861e+03
1.5200000e+02 -1.4308023e+03
1.5300000e+02 -1.4660005e+03
1.5400000e+02 -1.4813855e+03
1.5500000e+02 -1.4765737e+03
1.5600000e+02 -1.4512959e+03
1.5700000e+02 -1.4053988e+03
1.5800000e+02 -1.3388461e+03
1.5900000e+02 -1.2517188e+03
1.6000000e+02 -1.1442153e+03
1.6100000e+02 -1.0166508e+03
1.6200000e+02 -8.6945577e+02
1.6300000e+02 -7.0317421e+02
1.6400000e+02 -5.1846121e+02
1.6500000e+02 -3.1607995e+02
1.6600000e+02 -9.6898123e+01
1.6700000e+02 1.3811613e+02
1.6800000e+02 3.8789881e+02
1.6900000e+02 6.5129517e+02
1.7000000e+02 9.2706524e+02
1.7100000e+02 1.2138898e+03
1.7200000e+02 1.5103769e+03
1.7300000e+02 1.8150685e+03
1.7400000e+02 2.1264474e+03
1.7500000e+02 2.4429453e+03
1.7600000e+02 2.7629498e+03
1.7700000e+02 3.0848128e+03
1.7800000e+02 3.4068584e+03
1.7900000e+02 3.7273912e+03
1.8000000e+02 4.0447050e+03
1.8100000e+02 4.3570910e+03
1.8200000e+02 4.6628463e+03
1.8300000e+02 4.9602826e+03
1.8400000e+02 5.2477346e+03
1.8500000e+02 5.5235684e+03
1.8600000e+02 5.7861896e+03
1.8700000e+02 6.0340515e+03
1.8800000e+02 6.2656631e+03
1.8900000e+02 6.4795963e+03
1.9000000e+02 6.6744937e+03
1.9100000e+02 6.8490752e+03
1.9200000e+02 7.0021450e+03
1.9300000e+02 7.1325975e+03
1.9400000e+02 7.2394233e+03
1.9500000e+02 7.3217146e+03
1.9600000e+02 7.3786700e+03
1.9700000e+02 7.4095991e+03
1.9800000e+02 7.4139260e+03
1.9900000e+02 7.3911929e+03
2.0000000e+02 7.3410629e+03
2.0100000e+02 7.2633220e+03
2.0200000e+02 7.1578807e+03
2.0300000e+02 7.0247752e+03
2.0400000e+02 6.8641677e+03
2.0500000e+02 6.6763462e+03
2.0600000e+02 6.4617236e+03
2.0700000e+02 6.2208365e+03
2.0800000e+02 5.9543430e+03
2.0900000e+02 5.6630203e+03
2.1000000e+02 5.3477615e+03
2.1100000e+02 5.0095718e+03
2.1200000e+02 4.6495644e+03
2.1300000e+02 4.2689555e+03
2.1400000e+02 3.8690592e+03
2.1500000e+02 3.4512819e+03
2.1600000e+02 3.0171157e+03
2.1700000e+02 2.5681321e+03
2.1800000e+02 2.1059751e+03
2.1900000e+02 1.6323535e+03
2.2000000e+02 1.1490335e+03
2.2100000e+02 6.5783052e+02
2.2200000e+02 1.6060141e+02
2.2300000e+02 -3.4076432e+02
2.2400000e+02 -8.4435291e+02
2.2500000e+02 -1.3482350e+03
2.2600000e+02 -1.8504745e+03
2.2700000e+02 -2.3491372e+03
2.2800000e+02 -2.8422999e+03
2.2900000e+02 -3.3280587e+03
2.3000000e+02 -3.8045381e+03
2.3100000e+02 -4.2698992e+03
2.3200000e+02 -4.7223485e+03
2.3300000e+02 -5.1601455e+03
2.3400000e+02 -5.5816110e+03
2.3500000e+02 -5.9851348e+03
2.3600000e+02 -6.3691827e+03
2.3700000e+02 -6.7323034e+03
2.3800000e+02 -7.0731356e+03
2.3900000e+02 -7.3904135e+03
2.4000000e+02 -7.6829730e+03
2.4100000e+02 -7.9497565e+03
2.4200000e+02 -8.1898179e+03
2.4300000e+02 -8.4023265e+03
2.4400000e+02 -8.5865710e+03
2.4500000e+02 -8.7419621e+03
2.4600000e+02 -8.8680355e+03
2.4700000e+02 -8.9644534e+03
2.4800000e+02 -9.0310061e+03
2.4900000e+02 -9.0676126e+03
2.5000000e+02 -9.0743204e+03
2.5100000e+02 -9.0513056e+03
2.5200000e+02 -8.9988713e+03
2.5300000e+02 -8.9174460e+03
2.5400000e+02 -8.8075814e+03
2.5500000e+02 -8.6699496e+03
2.5600000e+02 -8.5053392e+03
2.5700000e+02 -8.3146521e+03
2.5800000e+02 -8.0988982e+03
2.5900000e+02 -7.8591907e+03
2.6000000e+02 -7.5967407e+03
2.6100000e+02 -7.3128514e+03
2.6200000e+02 -7.0089110e+03
2.6300000e+02 -6.6863867e+03
2.6400000e+02 -6.3468172e+03
2.6500000e+02 -5.9918055e+03
2.6600000e+02 -5.6230107e+03
2.6700000e+02 -5.2421405e+03
2.6800000e+02 -4.8509425e+03
2.6900000e+02 -4.4511964e+03
2.7000000e+02 -4.0447050e+03
2.7100000e+02 -3.6332858e+03
2.7200000e+02 -3.2187621e+03
2.7300000e+02 -2.8029549e+03
2.7400000e+02 -2.3876737e+03
2.7500000e+02 -1.9747082e+03
2.7600000e+02 -1.5658198e+03
2.7700000e+02 -1.1627333e+03
2.7800000e+02 -7.6712907e+02
2.7900000e+02 -3.8063477e+02
2.8000000e+02 -4.8181781e+00
2.8100000e+02 3.5882028e+02
2.8200000e+02 7.0885436e+02
2.8300000e+02 1.0439385e+03
2.8400000e+02 1.3628141e+03
2.8500000e+02 1.6643150e+03
2.8600000e+02 1.9473726e+03
2.8700000e+02 2.2110211e+03
2.8800000e+02 2.4544011e+03
2.8900000e+02 2.6767635e+03
2.9000000e+02 2.8774728e+03
2.9100000e+02 3.0560094e+03
2.9200000e+02 3.2119715e+03
2.9300000e+02 3.3450770e+03
2.9400000e+02 3.4551636e+03
2.9500000e+02 3.5421895e+03
2.9600000e+02 3.6062328e+03
2.9700000e+02 3.6474906e+03
2.9800000e+02 3.6662772e+03
2.9900000e+02 3.6630223e+03
3.0000000e+02 3.6382680e+03
3.0100000e+02 3.5926655e+03
3.0200000e+02 3.5269716e+03
3.0300000e+02 3.4420439e+03
3.0400000e+02 3.3388363e+03
3.0500000e+02 3.2183937e+03
3.0600000e+02 3.0818459e+03
3.0700000e+02 2.9304019e+03
3.0800000e+02 2.7653431e+03
3.0900000e+02 2.5880163e+03
3.1000000e+02 2.3998267e+03
3.1100000e+02 2.2022304e+03
3.1200000e+02 1.9967263e+03
3.1300000e+02 1.7848485e+03
3.1400000e+02 1.5681582e+03
3.1500000e+02 1.3482350e+03
3.1600000e+02 1.1266692e+03
3.1700000e+02 9.0505304e+02
3.1800000e+02 6.8497219e+02
3.1900000e+02 4.6799776e+02
3.2000000e+02 2.5567784e+02
3.2100000e+02 4.9529389e+01
3.2200000e+02 -1.4896973e+02
3.2300000e+02 -3.3838854e+02
3.2400000e+02 -5.1735049e+02
3.2500000e+02 -6.8454068e+02
3.2600000e+02 -8.3871285e+02
3.2700000e+02 -9.7869597e+02
3.2800000e+02 -1.1034004e+03
3.2900000e+02 -1.2118238e+03
3.3000000e+02 -1.3030565e+03
3.3100000e+02 -1.3762861e+03
3.3200000e+02 -1.4308023e+03
3.3300000e+02 -1.4660005e+03
3.3400000e+02 -1.4813855e+03
3.3500000e+02 -1.4765737e+03
3.3600000e+02 -1.4512959e+03
3.3700000e+02 -1.4053988e+03
3.3800000e+02 -1.3388461e+03
3.3900000e+02 -1.2517188e+03
3.4000000e+02 -1.1442153e+03
3.4100000e+02 -1.0166508e+03
3.4200000e+02 -8.6945577e+02
3.4300000e+02 -7.0317421e+02
3.4400000e+02 -5.1846121e+02
3.4500000e+02 -3.1607995e+02
3.4600000e+02 -9.6898123e+01
3.4700000e+02 1.3811613e+02
3.4800000e+02 3.8789881e+02
3.4900000e+02 6.5129517e+02
3.5000000e+02 9.2706524e+02
3.5100000e+02 1.2138898e+03
3.5200000e+02 1.5103769e+03
3.5300000e+02 1.8150685e+03
3.5400000e+02 2.1264474e+03
3.5500000e+02 2.4429453e+03
3.5600000e+02 2.7629498e+03
3.5700000e+02 3.0848128e+03
3.5800000e+02 3.4068584e+03
3.5900000e+02 3.7273912e+03
3.6000000e+02 4.0447050e+03
如果定义了 r，则代码 returns 是一个错误的极坐标图。要看到这一点，您必须注释 START 和 END 之间的代码。
编辑 1
我的 gnuplot 是 5.0 补丁级别 0。
编辑 2
这是我用上面的代码得到的输出。
似乎适用于 Gnuplot 5.0 补丁级别 0（右图），但不适用于 4.6 补丁级别 4（左图）
看来你的数据第二列的负数引起了麻烦，所以你需要绘制它的绝对值，abs():
plot FILE using 1:(abs())
令我印象深刻的是 gnuplot 在我们设置 rrange 后的行为。这可能是一个错误 (?)
让我们考虑以下 gnuplot 代码：
set term pdf
set output 'wrong.pdf'
set size ratio 1
set tmargin at screen 0.92
set bmargin at screen 0.08
set style line 11 linewidth 1 linecolor rgb 'gray80'
set polar
set angle degree
unset grid
set grid polar 45
# START ----------------------
r = 10000
set rrange [0:r]
set rtics 2000 format '' scale 0
# END ------------------------
unset border
unset xtics
unset ytics
set ytics axis nomirror scale 0 offset 0.3 2000,2000,10000
unset raxis
FILE = "FILE_matrix.dat"
plot FILE using 1:2 with lines lw 3 lc rgb "red" notitle
文件'FILE_matrix.dat'所在的位置（抱歉，它很长）
0.0000000e+00 4.0447050e+03
1.0000000e+00 4.3570910e+03
2.0000000e+00 4.6628463e+03
3.0000000e+00 4.9602826e+03
4.0000000e+00 5.2477346e+03
5.0000000e+00 5.5235684e+03
6.0000000e+00 5.7861896e+03
7.0000000e+00 6.0340515e+03
8.0000000e+00 6.2656631e+03
9.0000000e+00 6.4795963e+03
1.0000000e+01 6.6744937e+03
1.1000000e+01 6.8490752e+03
1.2000000e+01 7.0021450e+03
1.3000000e+01 7.1325975e+03
1.4000000e+01 7.2394233e+03
1.5000000e+01 7.3217146e+03
1.6000000e+01 7.3786700e+03
1.7000000e+01 7.4095991e+03
1.8000000e+01 7.4139260e+03
1.9000000e+01 7.3911929e+03
2.0000000e+01 7.3410629e+03
2.1000000e+01 7.2633220e+03
2.2000000e+01 7.1578807e+03
2.3000000e+01 7.0247752e+03
2.4000000e+01 6.8641677e+03
2.5000000e+01 6.6763462e+03
2.6000000e+01 6.4617236e+03
2.7000000e+01 6.2208365e+03
2.8000000e+01 5.9543430e+03
2.9000000e+01 5.6630203e+03
3.0000000e+01 5.3477615e+03
3.1000000e+01 5.0095718e+03
3.2000000e+01 4.6495644e+03
3.3000000e+01 4.2689555e+03
3.4000000e+01 3.8690592e+03
3.5000000e+01 3.4512819e+03
3.6000000e+01 3.0171157e+03
3.7000000e+01 2.5681321e+03
3.8000000e+01 2.1059751e+03
3.9000000e+01 1.6323535e+03
4.0000000e+01 1.1490335e+03
4.1000000e+01 6.5783052e+02
4.2000000e+01 1.6060141e+02
4.3000000e+01 -3.4076432e+02
4.4000000e+01 -8.4435291e+02
4.5000000e+01 -1.3482350e+03
4.6000000e+01 -1.8504745e+03
4.7000000e+01 -2.3491372e+03
4.8000000e+01 -2.8422999e+03
4.9000000e+01 -3.3280587e+03
5.0000000e+01 -3.8045381e+03
5.1000000e+01 -4.2698992e+03
5.2000000e+01 -4.7223485e+03
5.3000000e+01 -5.1601455e+03
5.4000000e+01 -5.5816110e+03
5.5000000e+01 -5.9851348e+03
5.6000000e+01 -6.3691827e+03
5.7000000e+01 -6.7323034e+03
5.8000000e+01 -7.0731356e+03
5.9000000e+01 -7.3904135e+03
6.0000000e+01 -7.6829730e+03
6.1000000e+01 -7.9497565e+03
6.2000000e+01 -8.1898179e+03
6.3000000e+01 -8.4023265e+03
6.4000000e+01 -8.5865710e+03
6.5000000e+01 -8.7419621e+03
6.6000000e+01 -8.8680355e+03
6.7000000e+01 -8.9644534e+03
6.8000000e+01 -9.0310061e+03
6.9000000e+01 -9.0676126e+03
7.0000000e+01 -9.0743204e+03
7.1000000e+01 -9.0513056e+03
7.2000000e+01 -8.9988713e+03
7.3000000e+01 -8.9174460e+03
7.4000000e+01 -8.8075814e+03
7.5000000e+01 -8.6699496e+03
7.6000000e+01 -8.5053392e+03
7.7000000e+01 -8.3146521e+03
7.8000000e+01 -8.0988982e+03
7.9000000e+01 -7.8591907e+03
8.0000000e+01 -7.5967407e+03
8.1000000e+01 -7.3128514e+03
8.2000000e+01 -7.0089110e+03
8.3000000e+01 -6.6863867e+03
8.4000000e+01 -6.3468172e+03
8.5000000e+01 -5.9918055e+03
8.6000000e+01 -5.6230107e+03
8.7000000e+01 -5.2421405e+03
8.8000000e+01 -4.8509425e+03
8.9000000e+01 -4.4511964e+03
9.0000000e+01 -4.0447050e+03
9.1000000e+01 -3.6332858e+03
9.2000000e+01 -3.2187621e+03
9.3000000e+01 -2.8029549e+03
9.4000000e+01 -2.3876737e+03
9.5000000e+01 -1.9747082e+03
9.6000000e+01 -1.5658198e+03
9.7000000e+01 -1.1627333e+03
9.8000000e+01 -7.6712907e+02
9.9000000e+01 -3.8063477e+02
1.0000000e+02 -4.8181781e+00
1.0100000e+02 3.5882028e+02
1.0200000e+02 7.0885436e+02
1.0300000e+02 1.0439385e+03
1.0400000e+02 1.3628141e+03
1.0500000e+02 1.6643150e+03
1.0600000e+02 1.9473726e+03
1.0700000e+02 2.2110211e+03
1.0800000e+02 2.4544011e+03
1.0900000e+02 2.6767635e+03
1.1000000e+02 2.8774728e+03
1.1100000e+02 3.0560094e+03
1.1200000e+02 3.2119715e+03
1.1300000e+02 3.3450770e+03
1.1400000e+02 3.4551636e+03
1.1500000e+02 3.5421895e+03
1.1600000e+02 3.6062328e+03
1.1700000e+02 3.6474906e+03
1.1800000e+02 3.6662772e+03
1.1900000e+02 3.6630223e+03
1.2000000e+02 3.6382680e+03
1.2100000e+02 3.5926655e+03
1.2200000e+02 3.5269716e+03
1.2300000e+02 3.4420439e+03
1.2400000e+02 3.3388363e+03
1.2500000e+02 3.2183937e+03
1.2600000e+02 3.0818459e+03
1.2700000e+02 2.9304019e+03
1.2800000e+02 2.7653431e+03
1.2900000e+02 2.5880163e+03
1.3000000e+02 2.3998267e+03
1.3100000e+02 2.2022304e+03
1.3200000e+02 1.9967263e+03
1.3300000e+02 1.7848485e+03
1.3400000e+02 1.5681582e+03
1.3500000e+02 1.3482350e+03
1.3600000e+02 1.1266692e+03
1.3700000e+02 9.0505304e+02
1.3800000e+02 6.8497219e+02
1.3900000e+02 4.6799776e+02
1.4000000e+02 2.5567784e+02
1.4100000e+02 4.9529389e+01
1.4200000e+02 -1.4896973e+02
1.4300000e+02 -3.3838854e+02
1.4400000e+02 -5.1735049e+02
1.4500000e+02 -6.8454068e+02
1.4600000e+02 -8.3871285e+02
1.4700000e+02 -9.7869597e+02
1.4800000e+02 -1.1034004e+03
1.4900000e+02 -1.2118238e+03
1.5000000e+02 -1.3030565e+03
1.5100000e+02 -1.3762861e+03
1.5200000e+02 -1.4308023e+03
1.5300000e+02 -1.4660005e+03
1.5400000e+02 -1.4813855e+03
1.5500000e+02 -1.4765737e+03
1.5600000e+02 -1.4512959e+03
1.5700000e+02 -1.4053988e+03
1.5800000e+02 -1.3388461e+03
1.5900000e+02 -1.2517188e+03
1.6000000e+02 -1.1442153e+03
1.6100000e+02 -1.0166508e+03
1.6200000e+02 -8.6945577e+02
1.6300000e+02 -7.0317421e+02
1.6400000e+02 -5.1846121e+02
1.6500000e+02 -3.1607995e+02
1.6600000e+02 -9.6898123e+01
1.6700000e+02 1.3811613e+02
1.6800000e+02 3.8789881e+02
1.6900000e+02 6.5129517e+02
1.7000000e+02 9.2706524e+02
1.7100000e+02 1.2138898e+03
1.7200000e+02 1.5103769e+03
1.7300000e+02 1.8150685e+03
1.7400000e+02 2.1264474e+03
1.7500000e+02 2.4429453e+03
1.7600000e+02 2.7629498e+03
1.7700000e+02 3.0848128e+03
1.7800000e+02 3.4068584e+03
1.7900000e+02 3.7273912e+03
1.8000000e+02 4.0447050e+03
1.8100000e+02 4.3570910e+03
1.8200000e+02 4.6628463e+03
1.8300000e+02 4.9602826e+03
1.8400000e+02 5.2477346e+03
1.8500000e+02 5.5235684e+03
1.8600000e+02 5.7861896e+03
1.8700000e+02 6.0340515e+03
1.8800000e+02 6.2656631e+03
1.8900000e+02 6.4795963e+03
1.9000000e+02 6.6744937e+03
1.9100000e+02 6.8490752e+03
1.9200000e+02 7.0021450e+03
1.9300000e+02 7.1325975e+03
1.9400000e+02 7.2394233e+03
1.9500000e+02 7.3217146e+03
1.9600000e+02 7.3786700e+03
1.9700000e+02 7.4095991e+03
1.9800000e+02 7.4139260e+03
1.9900000e+02 7.3911929e+03
2.0000000e+02 7.3410629e+03
2.0100000e+02 7.2633220e+03
2.0200000e+02 7.1578807e+03
2.0300000e+02 7.0247752e+03
2.0400000e+02 6.8641677e+03
2.0500000e+02 6.6763462e+03
2.0600000e+02 6.4617236e+03
2.0700000e+02 6.2208365e+03
2.0800000e+02 5.9543430e+03
2.0900000e+02 5.6630203e+03
2.1000000e+02 5.3477615e+03
2.1100000e+02 5.0095718e+03
2.1200000e+02 4.6495644e+03
2.1300000e+02 4.2689555e+03
2.1400000e+02 3.8690592e+03
2.1500000e+02 3.4512819e+03
2.1600000e+02 3.0171157e+03
2.1700000e+02 2.5681321e+03
2.1800000e+02 2.1059751e+03
2.1900000e+02 1.6323535e+03
2.2000000e+02 1.1490335e+03
2.2100000e+02 6.5783052e+02
2.2200000e+02 1.6060141e+02
2.2300000e+02 -3.4076432e+02
2.2400000e+02 -8.4435291e+02
2.2500000e+02 -1.3482350e+03
2.2600000e+02 -1.8504745e+03
2.2700000e+02 -2.3491372e+03
2.2800000e+02 -2.8422999e+03
2.2900000e+02 -3.3280587e+03
2.3000000e+02 -3.8045381e+03
2.3100000e+02 -4.2698992e+03
2.3200000e+02 -4.7223485e+03
2.3300000e+02 -5.1601455e+03
2.3400000e+02 -5.5816110e+03
2.3500000e+02 -5.9851348e+03
2.3600000e+02 -6.3691827e+03
2.3700000e+02 -6.7323034e+03
2.3800000e+02 -7.0731356e+03
2.3900000e+02 -7.3904135e+03
2.4000000e+02 -7.6829730e+03
2.4100000e+02 -7.9497565e+03
2.4200000e+02 -8.1898179e+03
2.4300000e+02 -8.4023265e+03
2.4400000e+02 -8.5865710e+03
2.4500000e+02 -8.7419621e+03
2.4600000e+02 -8.8680355e+03
2.4700000e+02 -8.9644534e+03
2.4800000e+02 -9.0310061e+03
2.4900000e+02 -9.0676126e+03
2.5000000e+02 -9.0743204e+03
2.5100000e+02 -9.0513056e+03
2.5200000e+02 -8.9988713e+03
2.5300000e+02 -8.9174460e+03
2.5400000e+02 -8.8075814e+03
2.5500000e+02 -8.6699496e+03
2.5600000e+02 -8.5053392e+03
2.5700000e+02 -8.3146521e+03
2.5800000e+02 -8.0988982e+03
2.5900000e+02 -7.8591907e+03
2.6000000e+02 -7.5967407e+03
2.6100000e+02 -7.3128514e+03
2.6200000e+02 -7.0089110e+03
2.6300000e+02 -6.6863867e+03
2.6400000e+02 -6.3468172e+03
2.6500000e+02 -5.9918055e+03
2.6600000e+02 -5.6230107e+03
2.6700000e+02 -5.2421405e+03
2.6800000e+02 -4.8509425e+03
2.6900000e+02 -4.4511964e+03
2.7000000e+02 -4.0447050e+03
2.7100000e+02 -3.6332858e+03
2.7200000e+02 -3.2187621e+03
2.7300000e+02 -2.8029549e+03
2.7400000e+02 -2.3876737e+03
2.7500000e+02 -1.9747082e+03
2.7600000e+02 -1.5658198e+03
2.7700000e+02 -1.1627333e+03
2.7800000e+02 -7.6712907e+02
2.7900000e+02 -3.8063477e+02
2.8000000e+02 -4.8181781e+00
2.8100000e+02 3.5882028e+02
2.8200000e+02 7.0885436e+02
2.8300000e+02 1.0439385e+03
2.8400000e+02 1.3628141e+03
2.8500000e+02 1.6643150e+03
2.8600000e+02 1.9473726e+03
2.8700000e+02 2.2110211e+03
2.8800000e+02 2.4544011e+03
2.8900000e+02 2.6767635e+03
2.9000000e+02 2.8774728e+03
2.9100000e+02 3.0560094e+03
2.9200000e+02 3.2119715e+03
2.9300000e+02 3.3450770e+03
2.9400000e+02 3.4551636e+03
2.9500000e+02 3.5421895e+03
2.9600000e+02 3.6062328e+03
2.9700000e+02 3.6474906e+03
2.9800000e+02 3.6662772e+03
2.9900000e+02 3.6630223e+03
3.0000000e+02 3.6382680e+03
3.0100000e+02 3.5926655e+03
3.0200000e+02 3.5269716e+03
3.0300000e+02 3.4420439e+03
3.0400000e+02 3.3388363e+03
3.0500000e+02 3.2183937e+03
3.0600000e+02 3.0818459e+03
3.0700000e+02 2.9304019e+03
3.0800000e+02 2.7653431e+03
3.0900000e+02 2.5880163e+03
3.1000000e+02 2.3998267e+03
3.1100000e+02 2.2022304e+03
3.1200000e+02 1.9967263e+03
3.1300000e+02 1.7848485e+03
3.1400000e+02 1.5681582e+03
3.1500000e+02 1.3482350e+03
3.1600000e+02 1.1266692e+03
3.1700000e+02 9.0505304e+02
3.1800000e+02 6.8497219e+02
3.1900000e+02 4.6799776e+02
3.2000000e+02 2.5567784e+02
3.2100000e+02 4.9529389e+01
3.2200000e+02 -1.4896973e+02
3.2300000e+02 -3.3838854e+02
3.2400000e+02 -5.1735049e+02
3.2500000e+02 -6.8454068e+02
3.2600000e+02 -8.3871285e+02
3.2700000e+02 -9.7869597e+02
3.2800000e+02 -1.1034004e+03
3.2900000e+02 -1.2118238e+03
3.3000000e+02 -1.3030565e+03
3.3100000e+02 -1.3762861e+03
3.3200000e+02 -1.4308023e+03
3.3300000e+02 -1.4660005e+03
3.3400000e+02 -1.4813855e+03
3.3500000e+02 -1.4765737e+03
3.3600000e+02 -1.4512959e+03
3.3700000e+02 -1.4053988e+03
3.3800000e+02 -1.3388461e+03
3.3900000e+02 -1.2517188e+03
3.4000000e+02 -1.1442153e+03
3.4100000e+02 -1.0166508e+03
3.4200000e+02 -8.6945577e+02
3.4300000e+02 -7.0317421e+02
3.4400000e+02 -5.1846121e+02
3.4500000e+02 -3.1607995e+02
3.4600000e+02 -9.6898123e+01
3.4700000e+02 1.3811613e+02
3.4800000e+02 3.8789881e+02
3.4900000e+02 6.5129517e+02
3.5000000e+02 9.2706524e+02
3.5100000e+02 1.2138898e+03
3.5200000e+02 1.5103769e+03
3.5300000e+02 1.8150685e+03
3.5400000e+02 2.1264474e+03
3.5500000e+02 2.4429453e+03
3.5600000e+02 2.7629498e+03
3.5700000e+02 3.0848128e+03
3.5800000e+02 3.4068584e+03
3.5900000e+02 3.7273912e+03
3.6000000e+02 4.0447050e+03
如果定义了 r，则代码 returns 是一个错误的极坐标图。要看到这一点，您必须注释 START 和 END 之间的代码。
编辑 1
我的 gnuplot 是 5.0 补丁级别 0。
编辑 2
似乎适用于 Gnuplot 5.0 补丁级别 0（右图），但不适用于 4.6 补丁级别 4（左图）
看来你的数据第二列的负数引起了麻烦，所以你需要绘制它的绝对值，abs():
plot FILE using 1:(abs())
令我印象深刻的是 gnuplot 在我们设置 rrange 后的行为。这可能是一个错误 (?)