Résumé
A scatter plot matrix is a grid (or matrix) of scatter plots used to visualize bivariate relationships between combinations of variables. Each scatter plot in the matrix visualizes the relationship between a pair of variables, allowing many relationships to be explored in one chart.
Discussion
When creating a chart object, optional arguments for the class constructor must be specified using the argument name; they cannot be specified by argument position. See the code sample section for an example of how to specify arguments using keywords.
Syntaxe
ScatterMatrix (fields, {showTrendLine}, {lowerLeft}, {upperRight}, {diagonal}, {sort}, {sortBy}, {title}, {description}, {dataSource}, {displaySize})| Paramètre | Explication | Type de données |
fields [fields,...] | A list of field names to display in the matrix. A minimum of three fields is required. | List |
showTrendLine | Indicates whether trend lines are visible in the scatter plots. True displays the lines. False hides the lines. | Boolean |
lowerLeft | Sets the display of the lower left half of the matrix. Supported options are R_SQUARED, PEARSONS_R, and SCATTERPLOTS. | String |
upperRight | Sets the display of the upper right half of the matrix. Supported options are R_SQUARED, PEARSONS_R, SCATTERPLOTS, PREVIEW_PLOT, and NONE. | String |
diagonal | Sets the display of the diagonal view. Supported options are FIELD_NAMES, HISTOGRAMS, and NONE. | String |
sort | The sorting method that is applied to the matrix. Supported options are ASC, DESC, and NONE. Use ASC or DESC to specify a sorting direction when sortBy is set to R_SQUARED or PEARSONS_R. When NONE is chosen, the matrix will be sorted by the order of the fields list. | String |
sortBy | The method that is used to sort the matrix when you want to sort the rows according to the metric scores for a target field. Supported options are R_SQUARED and PEARSONS_R. When R_SQUARED or PEARSONS_R are chosen, the matrix will be sorted by metrics for the field specified by the first item in the fields list. When this property is not explicitly set, the matrix will be sorted by the order of the fields list. | String |
title |
Sets the title of the chart. The title text appears at the top of the chart view and is used as the label for the chart in the Contents pane. | String |
description | Sets the description of the chart. The description text appears at the bottom of the chart view. | String |
dataSource | Sets the data source of the chart. When a chart is exported using the exportToSVG method or displayed in an ArcGIS Notebook, the data source is read and rendered on the chart. Valid data sources include paths to datasets, including local datasets, UNC paths, and service URLs, and arcpy.mp Layer objects. | Object |
displaySize [displaySize,...] | Sets the size of the chart when exported using the exportToSVG method or displayed in an ArcGIS Notebook. The value must be specified as a two-item list, where the first item is the width of the chart and the second item is the height of the chart. | List |
Propriétés
| Propriété | Explication | Type de données |
| dataSource (Lecture et écriture) | Sets the data source of the chart. When a chart is exported using the exportToSVG method or displayed in an ArcGIS Notebook, the data source is read and rendered on the chart. Valid data sources include paths to datasets, including local datasets, UNC paths, and service URLs, and arcpy.mp Layer objects. | Object |
| description (Lecture et écriture) | Sets the description of the chart. The description text appears at the bottom of the chart view. | String |
| diagonal (Lecture et écriture) | Sets the display of the diagonal view. Supported options are FIELD_NAMES, HISTOGRAMS, and NONE. | String |
| displaySize (Lecture et écriture) | Sets the size of the chart when exported using the exportToSVG method or displayed in an ArcGIS Notebook. The value must be specified as a two-item list, where the first item is the width of the chart and the second item is the height of the chart. | List |
| fields (Lecture et écriture) | A list of field names to display in the matrix. A minimum of three fields is required. | List |
| lowerLeft (Lecture et écriture) | Sets the display of the lower left half of the matrix. Supported options are R_SQUARED, PEARSONS_R, and SCATTERPLOTS. | String |
| showTrendLine (Lecture et écriture) | Indicates whether trend lines are visible in the scatter plots. True displays the lines. False hides the lines. | Boolean |
| sort (Lecture et écriture) | The sorting method that is applied to the matrix. Supported options are ASC, DESC, and NONE. Use ASC or DESC to specify a sorting direction when sortBy is set to R_SQUARED or PEARSONS_R. When NONE is chosen, the matrix will be sorted by the order of the fields list. | String |
| sortBy (Lecture et écriture) | The method that is used to sort the matrix when you want to sort the rows according to the metric scores for a target field. Supported options are R_SQUARED and PEARSONS_R . When R_SQUARED or PEARSONS_R are chosen, the matrix will be sorted by metrics for the field specified by the first item in the fields list. When this property is not explicitly set, the matrix will be sorted by the order of the fields list. | String |
| title (Lecture et écriture) | Sets the title of the chart. The title text appears at the top of the chart view and is used as the label in the Contents pane on the List By Drawing Order tab | String |
| type (Lecture seule) | The string value indicating the chart type. | String |
| upperRight (Lecture et écriture) | Sets the display of the upper right half of the matrix. Supported options are R_SQUARED, PEARSONS_R, SCATTERPLOTS, PREVIEW_PLOT, and NONE. | String |
.Vue d’ensemble des méthodes
| Méthode | Explication |
| addToLayer (layer_or_layerfile) | Adds the chart object to a layer or stand-alone table. |
| exportToSVG (path, width, height) | Exports the chart to SVG format. |
| updateChart () | Updates chart properties to sync changes between the object and the chart previously added to a layer. |
Méthodes
addToLayer (layer_or_layerfile)
| Paramètre | Explication | Type de données |
layer_or_layerfile | The chart will be added to the target object. The layer_or_layerfile argument can be a Layer or a Table object. | Object |
Often the final step after defining chart properties is to add the chart object to a layer or table using the addToLayer method.
Add a chart to an existing layer.
import arcpy
aprx = arcpy.mp.ArcGISProject("current")
map = aprx.listMaps()[0]
censusLayer = map.listLayers('Census Block Groups')[0]
# Add chart object to a layer
chart.addToLayer(censusLayer)exportToSVG (path, width, height)
| Paramètre | Explication | Type de données |
path | The path where the chart will be exported in SVG format. | String |
width | The width of the output graphic. | Integer |
height | The height of the output graphic. | Integer |
In some cases, you may want to save the chart as a graphic that can be shared and viewed outside of ArcGIS Pro. Exporting to the SVG graphic format is beneficial, as the chart elements and text are stored as vector elements that can be independently modified in a vector graphics software. An SVG graphic can also be resized to any scale without pixelation or loss in quality.
Export a chart that has a project layer data source to an .svg file.
import arcpy
aprx = arcpy.mp.ArcGISProject('current')
censusLayer = aprx.listMaps()[0].listLayers('Census Block Groups')[0]
# Set data source of chart object to a layer within current project
chart.dataSource = censusLayer
# Save the chart to file with dimensions width=500, height=500
chart.exportToSVG('populationByState.svg', 500, 500)Export a chart that has a feature service data source to an .svg file.
featureServiceURL = r'https://services1.arcgis.com/hLJbHVT9ZrDIzK0I/arcgis/rest/services/CrimesChiTheft/FeatureServer/0'
# Set data source of chart object to a feature service URL
chart.dataSource = featureServiceURL
# Save the chart to file with dimensions width=800, height=600
chart.exportToSVG('theftsPerBeat.svg', 800, 600)updateChart ()
Often the final step after defining chart properties is to add the chart object to a layer using the addToLayer method.
To further modify the chart properties, you can modify the properties of the original chart instead of starting from scratch with a new chart. You can then use the updateChart method to synchronize any changes into the chart that was added to the layer. This will allow the changes you make to be presented in the Chart properties pane and chart view.
Use the updateChart method to synchronize chart property changes into a layer.
chart.addToLayer(myLayer)
# Further modification is necessary
chart.description = "Data from the U.S. Census Bureau"
chart.updateChart()Exemple de code
Create a scatter plot matrix using a layer name and export it to an .svg file.
import arcpy
chart = arcpy.charts.ScatterMatrix(fields=["copd", "diabetes", "heart_failure", "hypertension", "high_cholesterol"],
lowerLeft="R_SQUARED", upperRight="PREVIEW_PLOT",
dataSource="health_indicators", displaySize=(800, 500))
chart.exportToSVG("scatter_matrix.svg")Vous avez un commentaire à formuler concernant cette rubrique ?