Plot a 2D field of arrows.
Call signature:
Where X, Y define the arrow locations, U, V define the arrowdirections, and C optionally sets the color.
Where X, Y define the arrow locations, U, V define the arrow directions, and C optionally sets the color. The default settings auto-scales the length of the arrows to a reasonable size. To change this behavior see the scale and scaleunits parameters. The defaults give a slightly swept-back arrow; to make the head a triangle, make headaxislength the same as headlength.
Arrow size
The default settings auto-scales the length of the arrows to a reasonable size.To change this behavior see the scale and scale_units parameters.
Arrow shape
The defaults give a slightly swept-back arrow; to make the head atriangle, make headaxislength the same as headlength. To make thearrow more pointed, reduce headwidth or increase headlength andheadaxislength. To make the head smaller relative to the shaft,scale down all the head parameters. You will probably do best to leaveminshaft alone.
Arrow outline
linewidths and edgecolors can be used to customize the arrowoutlines.
| Parameters: | - X, Y1D or 2D array-like, optional
The x and y coordinates of the arrow locations. If not given, they will be generated as a uniform integer meshgrid basedon the dimensions of U and V. If X and Y are 1D but U, V are 2D, X, Y are expanded to 2Dusing X,Y=np.meshgrid(X,Y). In this case len(X) and len(Y)must match the column and row dimensions of U and V. - U, V1D or 2D array-like
The x and y direction components of the arrow vectors. They must have the same number of elements, matching the number of arrowlocations. U and V may be masked. Only locations unmasked inU, V, and C will be drawn. - C1D or 2D array-like, optional
Numeric data that defines the arrow colors by colormapping via norm andcmap. This does not support explicit colors. If you want to set colors directly,use color instead. The size of C must match the number of arrowlocations. - units{'width', 'height', 'dots', 'inches', 'x', 'y' 'xy'}, default: 'width'
The arrow dimensions (except for length) are measured in multiples ofthis unit. The following values are supported: - 'width', 'height': The width or height of the axis.
- 'dots', 'inches': Pixels or inches based on the figure dpi.
- 'x', 'y', 'xy': X, Y or (sqrt{X^2 + Y^2}) in data units.
The arrows scale differently depending on the units. For'x' or 'y', the arrows get larger as one zooms in; for otherunits, the arrow size is independent of the zoom state. For'width or 'height', the arrow size increases with the width andheight of the axes, respectively, when the window is resized;for 'dots' or 'inches', resizing does not change the arrows. - angles{'uv', 'xy'} or array-like, optional, default: 'uv'
Method for determining the angle of the arrows. 'uv': The arrow axis aspect ratio is 1 so thatif UV the orientation of the arrow on the plot is 45 degreescounter-clockwise from the horizontal axis (positive to the right). Use this if the arrows symbolize a quantity that is not based onX, Y data coordinates. 'xy': Arrows point from (x, y) to (x+u, y+v).Use this for plotting a gradient field, for example. Alternatively, arbitrary angles may be specified explicitly as an arrayof values in degrees, counter-clockwise from the horizontal axis. In this case U, V is only used to determine the length of thearrows.
Note: inverting a data axis will correspondingly invert thearrows only with angles='xy'. - scalefloat, optional
Number of data units per arrow length unit, e.g., m/s per plot width; asmaller scale parameter makes the arrow longer. Default is None. If None, a simple autoscaling algorithm is used, based on the averagevector length and the number of vectors. The arrow length unit is given bythe scale_units parameter. - scale_units{'width', 'height', 'dots', 'inches', 'x', 'y', 'xy'}, optional
If the scale kwarg is None, the arrow length unit. Default is None. e.g. scale_units is 'inches', scale is 2.0, and (u,v)=(1,0),then the vector will be 0.5 inches long. If scale_units is 'width' or 'height', then the vector will be half thewidth/height of the axes. If scale_units is 'x' then the vector will be 0.5 x-axisunits. To plot vectors in the x-y plane, with u and v havingthe same units as x and y, useangles='xy',scale_units='xy',scale=1. - widthfloat, optional
Shaft width in arrow units; default depends on choice of units,above, and number of vectors; a typical starting value is about0.005 times the width of the plot. - headwidthfloat, optional, default: 3
Head width as multiple of shaft width. - headlengthfloat, optional, default: 5
Head length as multiple of shaft width. - headaxislengthfloat, optional, default: 4.5
Head length at shaft intersection. - minshaftfloat, optional, default: 1
Length below which arrow scales, in units of head length. Do notset this to less than 1, or small arrows will look terrible! - minlengthfloat, optional, default: 1
Minimum length as a multiple of shaft width; if an arrow lengthis less than this, plot a dot (hexagon) of this diameter instead. - pivot{'tail', 'mid', 'middle', 'tip'}, optional, default: 'tail'
The part of the arrow that is anchored to the X, Y grid. The arrowrotates about this point. 'mid' is a synonym for 'middle'. - colorcolor or color sequence, optional
Explicit color(s) for the arrows. If C has been set, color has noeffect. This is a synonym for the PolyCollectionfacecolor parameter.
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| Other Parameters: | - **kwargs
PolyCollection properties, optional All other keyword arguments are passed on to PolyCollection: | Property | Description |
|---|
agg_filter | a filter function, which takes a (m, n, 3) float array and a dpi value, and returns a (m, n, 3) array | alpha | float or None | animated | bool | antialiased or aa or antialiaseds | bool or sequence of bools | array | ndarray | capstyle | {'butt', 'round', 'projecting'} | clim | (vmin: float, vmax: float) | clip_box | Bbox | clip_on | bool | clip_path | Patch or (Path, Transform) or None | cmap | colormap or registered colormap name | color | color or sequence of rgba tuples | contains | callable | edgecolor or ec or edgecolors | color or sequence of colors or 'face' | facecolor or facecolors or fc | color or sequence of colors | figure | Figure | gid | str | hatch | {'/', ', '|', '-', '+', 'x', 'o', 'O', '.', '*'} | in_layout | bool | joinstyle | {'miter', 'round', 'bevel'} | label | object | linestyle or dashes or linestyles or ls | {'-', '--', '-.', ':', ', (offset, on-off-seq), ...} | linewidth or linewidths or lw | float or sequence of floats | norm | Normalize | offset_position | {'screen', 'data'} | offsets | array-like (N, 2) or (2,) | path_effects | AbstractPathEffect | picker | None or bool or float or callable | pickradius | unknown | rasterized | bool or None | sketch_params | (scale: float, length: float, randomness: float) | snap | bool or None | transform | Transform | url | str | urls | List[str] or None | visible | bool | zorder | float |
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See also
quiverkey- Add a key to a quiver plot.
Quiver: The Programmer’s Notebook 3.0.3
Description
Quiver is a notebook built for programmers. It lets you easily mix text, code, Markdown and LaTeX within one note, edit code with an awesome code editor, live preview Markdown and LaTeX, and find any note instantly via the full-text search.
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# Tutorials and Documentation
Quiver 3.0.3 Mean
Quiver comes with in-app tutorials and a comprehensive online wiki. Anyone can contribute to the wiki and make it better.
Quiver 3.0.3 3d
What’s New in Version 3.0.3
* Fixed an issue with pasting a URL from Chrome’s address bar
Quiver 3.0.3 6
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