Matrix Properties

The Matrix Properties sheet lists all kind of important information on a selected matrix. In fact, all relevant information that is stored in the object definition file of the matrix is displayed. For more information, refer to Basic concepts : properties of objects.

The Matrix Properties sheet appears:

General tab:

Object type and name:

Principal Components Coefficients "object name", or

Factor Analysis Coefficients "object name".

When you click this flat button, the matrix will be (re)opened.

Location:

The path and directory where this object is stored.

Object date and time:

Date and time when this object was last changed.

Object size:

Total size of the object on disk in bytes (.MAT).

Read only:

Select this check box to make the object read only. Clear this check box to make the object changeable.

Description:

Description of the object; freely editable. The description of a matrix is visible on the status bar of the Main window when moving the mouse pointer over the object in a Catalog.

Dependency tab (for dependent matrices):

Object type and name:

Principal Components Coefficients "object name", or

Factor Analysis Coefficients "object name".

When you click this flat button, the matrix will be (re)opened.

Definition:

The expression by which the object was created is listed, i.e. the object definition.

Up-to-date or not:

Lists whether this matrix is up-to-date or not. If not, the name of the object which was changed last is shown including that object's date and time.

Depends on:

In a tree view, the names of the objects are listed on which this matrix depends.

Calculate:

When the matrix has only been defined by its object definition:

  • click this button to (re)calculate the matrix by (re)executing the definition of this matrix.

Make Up-to-Date:

When the matrix is not up-to-date anymore,

i.e. when one or more objects on which this matrix depends have been changed, and when the matrix has been calculated already:

  • click this button to check all objects on which this matrix depends, see if these are up-to-date, if not, check all objects below, etc.,
  • recalculate all changed objects on which this matrix depends, and finally recalculate the matrix using all new changed objects.

Release Disk Space:

When the matrix has been calculated already:

  • click this button to temporarily 'remove' calculated values of the matrix.

The expression by which this dependent matrix was created remains stored in the object definition file (.MAT), so this matrix can always be recalculated.

Break Dependency Link:

Whether this matrix is Up-to-Date or not:

  • click this button to break the dependency link between this matrix and the objects on which it depends. This matrix will no longer depend on its input objects and cannot be recalculated if any input will be changed.

Do not break the dependency link if you wish to be able to update this matrix in a later stage on the basis of changed input objects.

Additional Info tab (when the matrix has been calculated):

Object type and name:

Principal Components Coefficients "object name", or
Factor Analysis Coefficients "object name".
When you click this flat button, the matrix will be (re)opened.

Additional info:

The total variance of each input band in the map list is listed and the percentage variance of each band that accounts for the eigenvalues.

Tips:

See also: