setting an array element with a sequence matplolib 3d


setting an array element with a sequence matplolib 3d



I have the following strange problem. I am trying to do a 3d plot. That works ok. I wanted to put the projections on the surfaces of the plot. My code looks at the moment like this


fig = plt.figure(figsize = (10,8))
ax = fig.add_subplot(111, projection='3d')

ax.plot_trisurf(xarr, yarr, zarr, cmap=cm.coolwarm, linewidth=50)
ax.set_xlabel('nMAE', fontsize = 14, linespacing = 1.5)
ax.set_ylabel('nDIFF', fontsize = 14)
ax.set_zlabel('nCounts', fontsize = 14, linespacing=1.5)

cset = ax.contour(np.array(xx), np.array(yy),
np.array(zz), zdir='z', offset=-100, cmap=cm.coolwarm)
cset = ax.contour(xx, yy, np.array(zz), zdir='x', offset=-40, cmap=cm.coolwarm)
cset = ax.contour(xx, yy, np.array(zz), zdir='y', offset=40, cmap=cm.coolwarm)

plt.show()



What is not working is the following line


cset = ax.contour(np.array(xx), np.array(yy),
np.array(zz), zdir='z', offset=-100, cmap=cm.coolwarm)



Here are the vectors


np.array(yy)
array([ 21, 6, 30, 3, 27, 61, 56, 52, 38, 14, 33, 12, 93,
129, 36, 11, 59, 9, 113, 18, 26, 8, 17, 10, 29, 2,
4, 16, 85, 55, 58, 45, 7, 15, 19, 5, 69, 57, 20,
158, 86, 118, 31, 107, 34, 92, 32, 28, 66, 54, 87, 25,
13, 99, 23, 60, 81, 24, 72, 123, 49, 63, 64, 71, 67,
40, 46, 48, 47, 95, 43, 159, 22, 37, 35, 105, 104, 42,
128, 53, 76, 75, 103, 65, 136, 144, 68, 77, 278, 98, 111,
114, 41, 84, 154, 62, 214, 124, 210, 1, 155, 79, 74, 80,
83, 318, 70, 120, 78, 44, 88, 73, 50, 110, 178, 51, 134,
106, 189, 91, 411, 135, 138, 143, 127, 122, 160, 94, 109, 226,
140, 117, 100, 133, 191, 141, 89, 288, 126, 97, 653, 121, 172,
161, 39, 96, 90, 130, 169, 142, 82, 132, 156, 137, 119, 102,
112, 188, 610, 115, 146, 234, 108, 150, 182, 170, 116, 223, 139,
197, 194, 241, 131, 181, 183, 152, 147, 250, 203, 165, 199, 218,
334, 167, 151, 384, 163, 162, 125, 148, 233, 354, 184, 168, 186,
180, 166, 369, 192, 101, 201, 157, 164, 419, 239], dtype=int64)



and


np.array(xx)
array([ 500., 1500., 2500., 3500., 4500., 5500., 6500.,
7500., 8500., 9500., 10500., 11500., 12500., 13500.,
14500., 15500., 16500., 17500., 18500., 19500., 20500.,
21500., 22500., 23500., 24500., 25500., 26500., 27500.,
28500.])



the zz has dimensions


np.array(zz).shape
(205,29)



as it should. Anyone can guess what is wrong? The complete error is


ValueError: setting an array element with a sequence.



I cannot unfortunately publish the data, but I hope the error is linked to how the data are structured...



Thanks in advance, Umberto




1 Answer
1



If you check shapes of X, Y and Z in contour3d example, you shall
find out that they are the same.
So, in order to make your code working, you
should extend your xx and yy to 2d arrays with np.meshgrid before creating a plot.


X


Y


Z


xx


yy


np.meshgrid


xx, yy = np.meshgrid(xx, yy)





My mistake. You are right... Thanks.
– Umberto
Jun 29 at 11:34





Glad to be helpful!
– taras
Jun 29 at 12:25






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