Parameters | Expression Parameters | Block Variable

Block Variable
Use this field to specify the variable indicating subgroups within arrays. Subsequent images are drawn by the Block Variable .
Leave this empty if there is only one block in an array or no blocking variable is desired. Without a Block Variable , only one image per array is drawn.
Note : When specifying a Block Variable, the x-Coordinate Variable and y-Coordinate Variable must be within-block coordinates.
To Specify a Block Variable:
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All of the variables in the specified data set are displayed in the Available Variables field.
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