Image.streamplot#

StreamplotManager.streamplot(var1: ndarray, var2: ndarray, ax: Axes | list[Axes] | int | None = None, **kwargs: Unpack[StreamplotKwargs]) → LineCollection[source]#

Plot a streamplot of a vector field.

The function uses the streamplot function from matplotlib.pyplot.

Parameters:

- alpha: float, default 1.0: Sets the opacity of the plot, where 1.0 is fully opaque and 0.0 is fully transparent.
- arrowsize: float, default 1.0: Sets the size of the arrows of the streamline.
- arrowstyle: str, default ‘-|>’: Sets the style of the arrows of the streamline.
- aspect: ‘auto’ | ‘equal’ | float, default ‘auto’: Sets the aspect ratio of the plot. The ‘auto’ keyword is the default option. The ‘equal’ keyword sets the same scaling for x and y. A float fixes the ratio between the y-scale and the x-scale (1.0 is the same as ‘equal’).
- ax: ax | int | None, default None: The axis where to plot. If None, the last considered axis will be used.
- bottom: float, default varies: The bottom limit of the axis / axes set. For the figure layout it is the space from the bottom border to the plot (default 0.1); for an inset zoom it is the bottom position of the inset (default 0.6 + height).
- brokenlines: bool, default True: Splits the streamlines in shorter segments.
- c: str, default self.color: Determines the color. If not defined, the program will loop over an array of 6 colors which are different for the most common vision deficiencies.
- clabel: str, default None: Sets the label of the colorbar.
- cmap: str, default ‘hot’: Selects the colormap. Some useful colormaps are: plasma, magma, seismic. Please avoid colormaps like jet or rainbow, which are not perceptively uniform and not suited for people with vision deficiencies.
- cpad: float, default 0.07: Fraction of original axes between colorbar and the axes (in axes units).
- cpos: {‘top’,’bottom’,’left’,’right’}, default None: Enables the colorbar and sets its position. If not defined, no colorbar is shown.
- cscale: {‘linear’,’log’,’symlog’,’twoslope’}, default ‘linear’: Sets the colorbar scale. Default is the linear (‘norm’) scale.
- cticks: {[float], None}, default None: If enabled (and different from None), sets manually the ticks on the colorbar.
- ctickslabels: str, default None: If enabled, sets manually ticks labels on the colorbar.
- density: float, default 1.0: Sets the density and closeness of the streamlines. The domain is divided in a 30x30 grid. When set as default, each cell contains at most a number of crossing streamplot line equal to this keyword.
- extend: {‘neither’,’both’,’min’,’max’}, default ‘neither’: Sets the extension of the triangular colorbar extension.
- extendrect: bool, default False: If True, the colorbar extension will be triangular.
- figsize: list[float], default varies: Sets the figure size. The default is [6*sqrt(ncol), 5*sqrt(nrow)], computed from the number of rows and columns (or [8,5] for a single plot).
- fontsize: float, default 17.0: Sets the fontsize for all the axis components.
- grid: bool | string, default False: Enables/disables the grid on the plot. If True it enables both axes grids. If ‘x’ or ‘y’ it enables only the x- or y-axis grid.
- hratio: [float], default [1.0]: Ratio between the rows of the plot. The default is that every plot row has the same height.
- hspace: [float], default []: The space between plot rows (in figure units). If not enough or too many spaces are considered, the program will remove the excess and fill the lacks with [0.1].
- integration_direction: {‘forward’, ‘backward’, ‘both’}, default:’both’: Sets the streamlines integration in the forward direction, backward direction, or both.
- labelsize: float, default fontsize: Sets the labels fontsize (which is the same for both labels). The default value corresponds to the value of the keyword ‘fontsize’.
- left: float, default varies: The left limit of the axis / axes set. For the figure layout it is the space from the left border to the plot (default 0.125); for an inset zoom it is the left position of the inset (default 0.6).
- lw: float, default 1.3: Sets the linewidth.
- maxlength: float, default 5.0: Sets the maximum length of a streamline in coordinates units.
- minlength: float, default 0.1: Sets the minimum length of a streamline in coordinates units.
- minorticks: str, default None: If not None enables the minor ticks on the plot (for both grid axes).
- ncol: int, default 1: The number of columns of subplots.
- nrow: int, default 1: The number of rows of subplots.
- proj: str, default None: Custom projection for the plot (e.g. 3D). Recommended only if needed. WARNING: pyPLUTO does not support 3D plotting for now, only 3D axes. The 3D plot feature will be available in future releases.
- right: float, default varies: The right limit of the axis / axes set. For the figure layout it is the space from the right border to the plot (default 0.9); for an inset zoom it is the right position of the inset (default left + 0.15).
- sharex: bool | str | Matplotlib axis, default False: Enables/disables the sharing of the x-axis between the subplots.
- sharey: bool | str | Matplotlib axis, default False: Enables/disables the sharing of the y-axis between the subplots.
- start_points: np.ndarray, default None: Sets the starting points of the streamlines, if a more controlled plot is wanted.
- suptitle: str, default None: Creates a figure title over all the subplots.
- ticksdir: {‘in’, ‘out’}, default ‘in’: Sets the ticks direction. The default option is ‘in’.
- tickssize: float | bool, default True: Sets the ticks fontsize (which is the same for both grid axes). The default value corresponds to the value of the keyword ‘fontsize’.
- tight: bool, default True: Enables/disables tight layout options for the figure. In case of a highly customized plot (e.g. ratios or space between rows and columns) the option is set by default to False since that option would not be available for standard matplotlib functions.
- title: str, default None: Places the title of the plot on top of it.
- titlepad: float, default 8.0: Sets the distance between the title and the top of the plot.
- titlesize: float, default fontsize: Sets the title fontsize. The default value corresponds to the value of the keyword ‘fontsize’.
- top: float, default varies: The top limit of the axis / axes set. For the figure layout it is the space from the top border to the plot (default 0.9); for an inset zoom it is the top position of the inset (default bottom + height).
- transpose: True/False, default False: Transposes the variable matrix. Use is not recommended if not really necessary (e.g. in case of highly customized variables and plots).
- tresh: float, default max(abs(vmin),vmax)*0.01: Sets the threshold for the colormap (used with composite colorscales such as twoslope or symlog).
- var1 (not optional): np.ndarray: The x1-component of the vector field.
- var2 (not optional): np.ndarray: The x2-component of the vector field.
- vmax: float: The maximum value of the variable to be computed / plotted.
- vmin: float: The minimum value of the variable to be computed / plotted.
- wratio: [float], default [1.0]: Ratio between the columns of the plot. The default is that every plot column has the same width.
- wspace: [float], default []: The space between plot columns (in figure units). If not enough or too many spaces are considered, the program will remove the excess and fill the lacks with [0.1].
- x1: np.ndarray, default ‘Default’: The x-axis array. If not defined, a default array will be generated.
- x2: np.ndarray, default ‘Default’: The y-axis array. If not defined, a default array will be generated.
- xlabelpad: float, default 4.0: The padding between the x-axis label and the axis.
- xrange: [float, float], default ‘Default’: Sets the range in the x-direction. If not defined, the range is computed automatically from the x-array.
- xscale: {‘linear’,’log’}, default ‘linear’: If enabled (and different from ‘Default’), sets automatically the scale on the x-axis. Data in log scale should be used with the keyword ‘log’, while data in linear scale should be used with the keyword ‘linear’.
- xticks: list[float] | None | bool, default True: If enabled (and different from True), sets manually ticks on the x-axis. In order to completely remove the ticks the keyword should be used with None.
- xtickslabels: list[str] | None | bool, default True: If enabled (and different from True), sets manually the ticks labels on the x-axis. In order to completely remove the ticks the keyword should be used with None. Note that fixed tickslabels should always correspond to fixed ticks.
- xtitle: str, default None: Sets and places the label of the x-axis.
- xtresh: float: The threshold parameter for the x-axis symlog/asinh scale.
- ylabelpad: float, default 4.0: The padding between the y-axis label and the axis.
- yrange: [float, float], default ‘Default’: Sets the range in the y-direction. If not defined, the range is computed automatically from the y-array.
- yscale: {‘linear’,’log’}, default ‘linear’: If enabled (and different from ‘Default’), sets automatically the scale on the y-axis. Data in log scale should be used with the keyword ‘log’, while data in linear scale should be used with the keyword ‘linear’.
- yticks: list[float] | None | bool, default True: If enabled (and different from True), sets manually ticks on the y-axis. In order to completely remove the ticks the keyword should be used with None.
- ytickslabels: list[str] | None | bool, default True: If enabled (and different from True), sets manually the ticks labels on the y-axis. In order to completely remove the ticks the keyword should be used with None. Note that fixed tickslabels should always correspond to fixed ticks.
- ytitle: str, default None: Sets and places the label of the y-axis.
- ytresh: float: The threshold parameter for the y-axis symlog/asinh scale.

Returns:

LineCollection

Examples

Example #1: Plot a streamplot of a vector field
```
>>> I.streamplot(D.Bx1, D.Bx2)
```