Results Postprocessing > Graph (XY) Plots > 8.2 Target Entities
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8.2 Target Entities
Graphs can be displayed for various model entities. There is no practical default for graph plots and some sort of target entity must be selected, be they nodes, elements, or paths. To change target entity selection for graph plots, press the Target Entities icon with the Object set to Graph.
Toggles the form to select target display entities for graph plots.
The following table describes in detail to which entities graph plots can be targeted. The entity types and their entity attributes are of course dependent on the type of graph you want and what you have selected as the Y-axis or X-axis quantity. Some combinations may not make any sense. For instance a global variable plotted against another global variable does not need the specification of target entities. However, results quantities versus anything will need target entities specified.
Entity
Description
Nodes
Individual nodes may be selected from which to create a graph. Nodes are selected graphically from the screen and fill the databox. However, you may type in any node numbers manually. Be sure to include the word Node in front of the IDs you type in manually, (i.e., Node 1 5 55 100 etc.). Elemental based results are extrapolated to the nodes and averaged.
Elements
Individual elements may be selected from which to create a graph. Elements are selected graphically from the screen and fill the databox. However, you may type in any element numbers manually or by selecting them graphically from the screen. Be sure to include the word Elem in front of the IDs you type in manually, (i.e., Elem 1 5 55 100 etc.). With elemental data, values will be extrapolated or averaged to the element centroid for reporting purposes.
Groups
Graphs can be limited to entities (nodes or elements) within a selected group. A selected group or groups must have elements or nodes in them otherwise the plot will not appear. A listbox allows selection of the group(s). Since groups can contain either nodes or element it is therefore also necessary to identify the entity attributes (nodes, element centroids, etc.) as explained in the following table.
Materials
As with groups, elements with certain material properties can be selected. As with elemental data, values will be extrapolated or averaged to the element centroid for reporting purposes.
Properties
As with groups, elements with certain element properties can be selected. As with elemental data, values will be extrapolated or averaged to the element centroid for reporting purposes.
Path
A path can be defined in a variety of ways. The graph will be created by extrapolating results from the elements that touch the path to points that lie on that path. The path can be defined as a collection of points (geometric grids or nodes), curves, or edges of surfaces and elements. A select listbox will appear to allow you to type in individual beams/curves/etc. or select them graphically from the screen. When typing in individual beam element IDs make sure the word “Elem” is in front of all the IDs, (e.g., “Elem 1 3 5 10 20:40 100:150:10.”). When a path is selected as the target entity and that path is defined by curves or beams/element edges, you need to also specify in an accompanying databox, the number of result locations to extract data from for the resulting plot. This is referred to as Points Per Segment in the Target Entities form.
In addition to targeting the above entities for a graph plot, the graph must be isolated to attributes of the entities as described in the following table. When nodes or elements are specifically targeted for the plot these choices are not available. However, for group or path target entities, the following choices are available.
Attribute
Description
Nodes
Specifies the use of the nodes of the target entities for extraction of the results value. Elemental based data are extrapolated to the nodes and averaged.
Element Centroids
Specifies that results be extracted at the element centroids for the plot. Nodal based data are summed and averaged at the centroid.
Points Per Segment
This is the number of points to be created for a graph using a Path as its Target Entity. The number of points generated in between selected nodes or curve end points is the number specified less one. A point will always be created at node points and end points of curves or element edges. The number of points can be one (1) to any positive number.
Points
When a path is the target entity, Points specifies that results be extracted at geometric points along that path. You can select these points graphically which can be made up of nodes, points, intersections, screen positions, etc. If the Number of Segments is one (1), a point on the graph will be created for each node. If two (2) is specified then an intermediate point will be created between each node. The number of points per segment less one will be created (interpolated) between points if greater than one (1). The path through the points will be piece wise linear (PWL). See notes below.
Curves
When a path is the target entity, specifies that path by the selection of geometric curves. These curves can be lines or edges of surfaces and elements. The select mechanism gives you control for defining all of these choices. If the Number of Segments is one (1), a point on the graph will be created for each end point of selected curves. If two (2) is specified then an intermediate point will be created between each end point. The number of points per segment less one will be created (interpolated) between end points and evaluated at equal arc lengths along each curve if greater than one (1). See notes below.
Edges/Beams
When a path is the target entity, specifies that path as beams or element edges. The number of points per segment less one (1) will be generated along each element edge. Midside nodes are not used by necessity. The points are generated at equal parametric locations along the edge using the order/geometry of the element to determine the locations. See notes below.
Notes on Path Target Entities:
1. The Point and Curve types have a dependency on the current group. This is important if you are working in small sections of a large model. The current group will limit the scope of the search for potential elements to contain the XYZ points generated. Thus selecting points that are not in the current group will result in no plot.
2. The Edges/Beam type is the most efficient interpolator. Since the elements are specified in the input, interpolation of results is a direct operation without any global searching for point mapping of global to parametric space.
3. When plotting versus Path Length, distances are calculated as straight line distances between interpolated points. If curves or edges are contiguous, the matching end points appear only once. If disjointed paths are specified, the distance value is reset to zero and the plot will zig-zag back to zero for the start of each disjointed section.
Important:  
Once a target entity has been selected, it will remain the target entity for any graph until the user physically changes it.