我正在尝试绘制流程的流线图。它将是一个直径为 D = 1 的圆柱体，处于均匀流中。 dominium x 从 0 到 37.5，y 从 21.1 到 0，圆柱体的中心位于 P(10.5,12)
matplotlib.pyplot.streamplot(x, y, uC, vC, \\
density=4, linewidth=0.5, color='k', arrowsize=0.1)
但是我得到了下图:
为什么轴限制与我的 dominium 值不匹配？
我想绘制圆柱体，但它大约会进入 (-3,25)。不在 (10.5,12) 中，因为它确实应该如此。
编辑:正如一些用户所说的 x 和 y 一定是错的，这里你有相同的 x，y 和箭袋。如您所见，这不是问题所在。
plt.quiver(x, y, uC, vC)
x = array([ 0.0875 , 0.2625 , 0.4375 , 0.6125 ,
0.78702903, 0.96108708, 1.13514513, 1.30920318,
1.48263691, 1.65544633, 1.82825575, 2.00106516,
2.17305096, 2.34421315, 2.51537534, 2.68653753,
2.85662006, 3.02562294, 3.19462581, 3.36362868,
3.53122797, 3.69742367, 3.86361938, 4.02981508,
4.19420566, 4.35679112, 4.51937658, 4.68196204,
4.84225792, 5.00026421, 5.15827051, 5.31627681,
5.47142954, 5.6237287 , 5.77602786, 5.92832702,
6.07714645, 6.22248615, 6.36782585, 6.51316555,
6.65437309, 6.79144846, 6.92852384, 7.06559921,
7.19791953, 7.32548479, 7.45305006, 7.58061532,
7.7029027 , 7.8199122 , 7.93692171, 8.05393121,
8.16531214, 8.27106448, 8.37681682, 8.48256916,
8.58256916, 8.67681682, 8.77106448, 8.86531214,
8.95393121, 9.03692171, 9.1199122 , 9.2029027 ,
9.28061532, 9.35305006, 9.42548479, 9.49791953,
9.56559921, 9.62852384, 9.69144846, 9.75437309,
9.81316555, 9.86782585, 9.92248615, 9.97714645,
10.02832702, 10.07602786, 10.1237287 , 10.17142954,
10.21627681, 10.25827051, 10.30026421, 10.34225792,
10.38196204, 10.41937658, 10.45679112, 10.49420566,
10.52981508, 10.56361938, 10.59742367, 10.63122797,
10.66362868, 10.69462581, 10.72562294, 10.75662006,
10.78653753, 10.81537534, 10.84421315, 10.87305096,
10.90106516, 10.92825575, 10.95544633, 10.98263691,
11.00920318, 11.03514513, 11.06108708, 11.08702903,
11.1125 , 11.1375 , 11.1625 , 11.1875 ,
11.2125 , 11.2375 , 11.2625 , 11.2875 ,
11.3125 , 11.3375 , 11.3625 , 11.3875 ,
11.4125 , 11.4375 , 11.4625 , 11.4875 ,
11.5125 , 11.5375 , 11.5625 , 11.5875 ,
11.6125 , 11.6375 , 11.6625 , 11.6875 ,
11.7125 , 11.7375 , 11.7625 , 11.7875 ,
11.8125 , 11.8375 , 11.8625 , 11.8875 ,
11.9125 , 11.9375 , 11.9625 , 11.9875 ,
12.0125 , 12.0375 , 12.0625 , 12.0875 ,
12.1125 , 12.1375 , 12.1625 , 12.1875 ,
12.2125 , 12.2375 , 12.2625 , 12.2875 ,
12.3125 , 12.3375 , 12.3625 , 12.3875 ,
12.4125 , 12.4375 , 12.4625 , 12.4875 ,
12.5125 , 12.5375 , 12.5625 , 12.5875 ,
12.6125 , 12.6375 , 12.6625 , 12.6875 ,
12.7125 , 12.7375 , 12.7625 , 12.7875 ,
12.8125 , 12.8375 , 12.8625 , 12.8875 ,
12.9125 , 12.9375 , 12.9625 , 12.9875 ,
13.0125 , 13.0375 , 13.0625 , 13.0875 ,
13.1125 , 13.1375 , 13.1625 , 13.1875 ,
13.21269549, 13.23808648, 13.26347746, 13.28886845,
13.31448159, 13.34031688, 13.36615217, 13.39198747,
13.41807502, 13.44441483, 13.47075465, 13.49709446,
13.52372047, 13.55063268, 13.57754489, 13.6044571 ,
13.63169369, 13.65925466, 13.68681564, 13.71437661,
13.74230483, 13.7706003 , 13.79889578, 13.82719125,
13.85590198, 13.88502798, 13.91415397, 13.94327996,
13.97287483, 14.00293858, 14.03300233, 14.06306608,
14.09365839, 14.12477927, 14.15590015, 14.18702103,
14.21873667, 14.25104709, 14.28335751, 14.31566792,
14.34864624, 14.38229246, 14.41593868, 14.4495849 ,
14.48397943, 14.51912227, 14.5542651 , 14.58940794,
14.62538702, 14.66220233, 14.69901765, 14.73583297,
14.77358012, 14.8122591 , 14.85093808, 14.88961706,
14.92933106, 14.9700801 , 15.01082914, 15.05157818,
15.0934728 , 15.136513 , 15.1795532 , 15.2225934 ,
15.26689657, 15.31246271, 15.35802885, 15.40359499,
15.45054749, 15.49888635, 15.54722522, 15.59556409,
15.64541755, 15.69678561, 15.74815367, 15.79952173,
15.85253591, 15.90719621, 15.96185651, 16.01651681,
16.07295611, 16.1311744 , 16.1893927 , 16.24761099,
16.3077402 , 16.36978031, 16.43182043, 16.49386055,
16.55793988, 16.62405842, 16.69017697, 16.75629551,
16.82457503, 16.89501553, 16.96545603, 17.03589653,
17.10861016, 17.18359692, 17.25858368, 17.33357044,
17.41092975, 17.49066163, 17.5703935 , 17.65012537,
17.73231355, 17.81695802, 17.9016025 , 17.98624697,
18.07341316, 18.16310105, 18.25278893, 18.34247682,
18.43473132, 18.52955241, 18.62437351, 18.71919461,
18.81660515, 18.91660515, 19.01660515, 19.11660515,
19.21919461, 19.32437351, 19.42955241, 19.53473132,
19.64247682, 19.75278893, 19.86310105, 19.97341316,
20.08624697, 20.2016025 , 20.31695802, 20.43231355,
20.55012537, 20.6703935 , 20.79066163, 20.91092975,
21.03357044, 21.15858368, 21.28359692, 21.40861016,
21.53589653, 21.66545603, 21.79501553, 21.92457503,
22.05629551, 22.19017697, 22.32405842, 22.45793988,
22.59386055, 22.73182043, 22.86978031, 23.0077402 ,
23.14761099, 23.2893927 , 23.4311744 , 23.57295611,
23.71651681, 23.86185651, 24.00719621, 24.15253591,
24.29952173, 24.44815367, 24.59678561, 24.74541755,
24.89556409, 25.04722522, 25.19888635, 25.35054749,
25.50359499, 25.65802885, 25.81246271, 25.96689657,
26.1225934 , 26.2795532 , 26.436513 , 26.5934728 ,
26.75157818, 26.91082914, 27.0700801 , 27.22933106,
27.38961706, 27.55093808, 27.7122591 , 27.87358012,
28.03583297, 28.19901765, 28.36220233, 28.52538702,
28.68940794, 28.8542651 , 29.01912227, 29.18397943,
29.3495849 , 29.51593868, 29.68229246, 29.84864624,
30.01566792, 30.18335751, 30.35104709, 30.51873667,
30.68702103, 30.85590015, 31.02477927, 31.19365839,
31.36306608, 31.53300233, 31.70293858, 31.87287483,
32.04327996, 32.21415397, 32.38502798, 32.55590198,
32.72719125, 32.89889578, 33.0706003 , 33.24230483,
33.41437661, 33.58681564, 33.75925466, 33.93169369,
34.1044571 , 34.27754489, 34.45063268, 34.62372047,
34.79709446, 34.97075465, 35.14441483, 35.31807502,
35.49198747, 35.66615217, 35.84031688, 36.01448159,
36.18886845, 36.36347746, 36.53808648, 36.71269549,
36.8875 , 37.0625 , 37.2375 , 37.4125 ])
y = array([ 21.0125 , 20.8375 , 20.6625 , 20.4875 ,
20.31306738, 20.13920213, 19.96533688, 19.79147163,
19.61839551, 19.44610852, 19.27382153, 19.10153455,
18.93033727, 18.76022971, 18.59012215, 18.42001459,
18.251397 , 18.08426939, 17.91714178, 17.75001416,
17.58489649, 17.42178875, 17.25868101, 17.09557327,
16.93512806, 16.77734538, 16.61956269, 16.46178001,
16.30744068, 16.15654472, 16.00564876, 15.8547528 ,
15.70817439, 15.56591355, 15.4236527 , 15.28139185,
15.14433954, 15.01249576, 14.88065198, 14.7488082 ,
14.62296276, 14.50311566, 14.38326856, 14.26342146,
14.15012386, 14.04337576, 13.93662767, 13.82987957,
13.72987957, 13.63662767, 13.54337576, 13.45012386,
13.36342146, 13.28326856, 13.20311566, 13.12296276,
13.0488082 , 12.98065198, 12.91249576, 12.84433954,
12.78139185, 12.7236527 , 12.66591355, 12.60817439,
12.5547528 , 12.50564876, 12.45654472, 12.40744068,
12.36178001, 12.31956269, 12.27734538, 12.23512806,
12.19557327, 12.15868101, 12.12178875, 12.08489649,
12.05001416, 12.01714178, 11.98426939, 11.951397 ,
11.92001459, 11.89012215, 11.86022971, 11.83033727,
11.80153455, 11.77382153, 11.74610852, 11.71839551,
11.69147163, 11.66533688, 11.63920213, 11.61306738,
11.5875 , 11.5625 , 11.5375 , 11.5125 ,
11.4875 , 11.4625 , 11.4375 , 11.4125 ,
11.3875 , 11.3625 , 11.3375 , 11.3125 ,
11.2875 , 11.2625 , 11.2375 , 11.2125 ,
11.1875 , 11.1625 , 11.1375 , 11.1125 ,
11.0875 , 11.0625 , 11.0375 , 11.0125 ,
10.9875 , 10.9625 , 10.9375 , 10.9125 ,
10.8875 , 10.8625 , 10.8375 , 10.8125 ,
10.7875 , 10.7625 , 10.7375 , 10.7125 ,
10.6875 , 10.6625 , 10.6375 , 10.6125 ,
10.5875 , 10.5625 , 10.5375 , 10.5125 ,
10.4875 , 10.4625 , 10.4375 , 10.4125 ,
10.3875 , 10.3625 , 10.3375 , 10.3125 ,
10.2875 , 10.2625 , 10.2375 , 10.2125 ,
10.1875 , 10.1625 , 10.1375 , 10.1125 ,
10.0875 , 10.0625 , 10.0375 , 10.0125 ,
9.9875 , 9.9625 , 9.9375 , 9.9125 ,
9.8875 , 9.8625 , 9.8375 , 9.8125 ,
9.7875 , 9.7625 , 9.7375 , 9.7125 ,
9.6875 , 9.6625 , 9.6375 , 9.6125 ,
9.5875 , 9.5625 , 9.5375 , 9.5125 ,
9.48693262, 9.46079787, 9.43466312, 9.40852837,
9.38160449, 9.35389148, 9.32617847, 9.29846545,
9.26966273, 9.23977029, 9.20987785, 9.17998541,
9.148603 , 9.11573061, 9.08285822, 9.04998584,
9.01510351, 8.97821125, 8.94131899, 8.90442673,
8.86487194, 8.82265462, 8.78043731, 8.73821999,
8.69255932, 8.64345528, 8.59435124, 8.5452472 ,
8.49182561, 8.43408645, 8.3763473 , 8.31860815,
8.25566046, 8.18750424, 8.11934802, 8.0511918 ,
7.97703724, 7.89688434, 7.81673144, 7.73657854,
7.64987614, 7.55662424, 7.46337233, 7.37012043,
7.27012043, 7.16337233, 7.05662424, 6.94987614,
6.83657854, 6.71673144, 6.59688434, 6.47703724,
6.3511918 , 6.21934802, 6.08750424, 5.95566046,
5.81860815, 5.6763473 , 5.53408645, 5.39182561,
5.2452472 , 5.09435124, 4.94345528, 4.79255932,
4.63821999, 4.48043731, 4.32265462, 4.16487194,
4.00442673, 3.84131899, 3.67821125, 3.51510351,
3.34998584, 3.18285822, 3.01573061, 2.848603 ,
2.67998541, 2.50987785, 2.33977029, 2.16966273,
1.99846545, 1.82617847, 1.65389148, 1.48160449,
1.30852837, 1.13466312, 0.96079787, 0.78693262,
0.6125 , 0.4375 , 0.2625 , 0.0875 ])
最佳答案
正如我所怀疑的，问题出在您的 x 和 y 数组上。来自 the streamplot documentation :
x, y :1d arrays
an evenly spaced grid.
您的 x 和 y 坐标不是均匀分布的(对于您的 y 坐标，它们也单调递减而不是递增).
为了使用 streamplot 绘制您的数据，您需要将其重新采样到常规的二维网格上。例如，您可以使用 scipy.interpolate.interp2d :
from scipy.interpolate import interp2d
# regularly spaced grid spanning the domain of x and y
xi = np.linspace(x.min(), x.max(), x.size)
yi = np.linspace(y.min(), y.max(), y.size)
# bicubic interpolation
uCi = interp2d(x, y, uC)(xi, yi)
vCi = interp2d(x, y, vC)(xi, yi)
plt.streamplot(xi, yi, uCi, vCi)
关于python - matplotlib.pyplot.streamplot 中的轴错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/34711705/