arundsouza asked . 2020-08-17

Why is there no DataIndex field in cursor_info for scatter plots?

Export cursor data to the workspace using the following steps:

1. Generate a scatter plot using the following code:

[x, y] = meshgrid (0: 0.1: 1.0: .1: 1);

scatter(x(:), y(:),10)

2. Add a few data cursors on the figure.

3. Right-click on the figure and select the ‘Export Cursor Data to Workspace’ option.

The "cursor_info" structure appears in the workspace. This structure has sub-structures corresponding to each data cursor on the plot. I see that each of these sub-structures has two fields: ‘Target’ and ‘Position’.

However, for a plot generated using the PLOT function (e.g., x1 = [1 2 3]; y1 = [4 5 6]; plot(x1,y1);), I find that the corresponding data cursor structures have three fields: ‘Target’, ‘Position’ and ‘DataIndex’.

Note the additional 'DataIndex' field for data cursors in the latter case. Why is there no such 'DataIndex' field in cursor_info for scatter plots?

matlab , ploting , plot , dataset

Expert Answer

John Williams answered . 2024-12-21 15:19:02

The 'DataIndex' field is created in the "cursor_info" structure only when data cursors are added to line objects.

This field does not exist for images, surfaces, or any other object.

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