![]() ![]() ‘dots’ or ‘inches’: pixels or inches, based on the figure dpi ‘width’ or ‘height’: the width or height of the axis ![]() The arrow dimensions (except for length) are measured in multiples of this unit. This is important to take into account, since depending on the axis aspect ratio, a gradient (u,v)=(1,1) won't have a 45 degrees angle. In our case, the ratio between U and V is one, therefore the arrows will point in 45 degrees in the 'uv' case, however, in the 'xy' case, as the range of the y and x axis is different, the arrows won't point in 45 degrees in order to preserve the displacement from (x,y) to (x+u, y+v). Use this for plotting a gradient field, for example. ‘xy’: arrows point from (x,y) to (x+u, y+v). ‘uv’: the arrow axis aspect ratio is 1 so that if U*=*V the orientation of the arrow on the plot is 45 degrees counter-clockwise from the horizontal axis (positive to the right). Method for determining the angle of the arrows. The data for all the plots is the same, and can be reproduced using this code: x = np.linspace(0,50,5)Īngles :, array, optional Each example has an image that can be expanded by clicking on it. It is true that the documentation is not completely clear, and there are many parameters with similar names which in addition to that, are unique to quiver.īelow there are many examples of the behaviour of different parameters, in particular the ones of interest to this question: angles, units and scale_units. Edit: Examples of parameter behaviour of matplotlib's quiver That is because the keyword units affects the arrow dimensions except for length, and scale_units affects only the lenght. Thus, using this arguments your problem will be solved. ![]() To plot vectors in the x-y plane, with u and v having the same units as x and y, use angles='xy', scale_units='xy', scale=1 home/takaya/miniconda3/envs/uptodate/lib/python3.6/site-packages/matplotlib/quiver.py:733: RuntimeWarning: invalid value encountered in less Short = np.repeat(length < minsh, 8, axis=1) home/takaya/miniconda3/envs/uptodate/lib/python3.6/site-packages/matplotlib/quiver.py:719: RuntimeWarning: invalid value encountered in less home/takaya/miniconda3/envs/uptodate/lib/python3.6/site-packages/matplotlib/quiver.py:666: RuntimeWarning: invalid value encountered in multiply Length = a * (widthu_per_lenu / (self.scale * self.width)) Gives the following error: /home/takaya/miniconda3/envs/uptodate/lib/python3.6/site-packages/matplotlib/quiver.py:666: RuntimeWarning: divide by zero encountered in double_scalars Pivot='mid', angles='xy', scale_units='xy') Pivot='mid', angles='xy', scale_units='xy', scales=1.)Īnd: ax.quiver(yy, zz, Setting the quiver options to the following only gives dots for what the arrows should be: ax.quiver(yy, zz, Im = ax.contourf(T_clim.YC, T_clim.Z, T_clim, levels=Tlevs) What I'm currently getting are horizontal arrows with the following code: Tlevs = np.arange(-1.,8.5.5) + 0. In my axes, one vertical pixel is much less physical distance than one horizontal pixel, and I want quiver to autoscale the arrows to this aspect ratio. The documentation is quite confusing and I haven't been able to parse out how to set each parameter. ![]() I've been spending the past couple of hours trying to customize matplotlib.quiver without much luck. ![]()
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