Matplotlib：顫抖二維數組

我想創建一個給定的二維數組的2D矢量字段，其中包含使用顫抖的向量的兩個組件。

鑑於數組b：

>>> b 
VigraArray(shape=(512, 512, 2), axistags=x y c, dtype=float32, data= 
[[[ 0.59471679 0.51902866 0.38904327 ..., -0.56878477 -0.50834674 
-0.48382956] 
[ 0.58222073 0.50713873 0.37990916 ..., -0.56091702 -0.50057167 
-0.47613338] 
[ 0.53815156 0.46551338 0.34787226 ..., -0.54245669 -0.48314109 
-0.45911735] 
...,

，並使用顫抖：

>>> X,Y = meshgrid(range(b.shape[0]),range(b.shape[1])) 
>>> quiver(X,Y,b[...,0],b[...,1])

回報：

Traceback (most recent call last): 
File "<stdin>", line 1, in <module> 
File "/usr/lib/pymodules/python2.7/matplotlib/pyplot.py", line 2892, in quiver 
    ret = ax.quiver(*args, **kw) 
File "/usr/lib/pymodules/python2.7/matplotlib/axes.py", line 6641, in quiver 
    q = mquiver.Quiver(self, *args, **kw) 
File "/usr/lib/pymodules/python2.7/matplotlib/quiver.py", line 419, in __init__ 
self.set_UVC(U, V, C) 
File "/usr/lib/pymodules/python2.7/matplotlib/quiver.py", line 463, in set_UVC 
    U = ma.masked_invalid(U, copy=False).ravel() 
File "/usr/lib/python2.7/dist-packages/numpy/ma/core.py", line 3969, in ravel 
    r._mask = ndarray.ravel(self._mask).reshape(r.shape) 
File "/usr/lib/python2.7/dist-packages/vigra/arraytypes.py", line 1308, in reshape 
    res = numpy.ndarray.reshape(self, shape, order) 
TypeError: an integer is required

我從來沒有使用VigraArray與matplotlib的問題，所以我不認爲這是問題。感謝幫助！

來源

2014-03-25 l4l1lu

你試過'b [：，0]'而不是'b [...，0]'？ – Schorsch

我試過'b [：，：，0]'，'b [：，0]'形狀錯了，但是同樣的錯誤 – l4l1lu

事實上，pylab.quiver似乎沒有正確處理vigra.VigraArray。下面的替換爲我工作：

b[...,0] = numpy.array(b[...,0]) 
b[...,1] = numpy.array(b[...,1])

來源

2014-03-26 13:01:55 l4l1lu

Matplotlib：顫抖二維數組

回答

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