Find Difference Map

Group (Subgroup)

Statistics (Misc)

Description

This Filter calculates the difference between two Attribute Arrays. The arrays must have the same primitive type (e.g., float), component dimensions and number of tuples. The Filter uses the following pseudocode to calculate the difference map:

for i to all tuples in the arrays
    for j to number of components of the arrays
        differenceMap[number of components * i + j] = firstSelectedArray[number of components * i + j] - secondSelectedArray[number of components * i + j]
    end loop over number of components
end loop over all tuples

Note that in the above algorithm, the difference is taken as the first selected Attribute Array minus the second selected Attribute Array. The differences are also taken component by component. Therefore, two selected scalar arrays will result in a scalar difference map, whereas two selected 3 component vector arrays would result in a 3 component vector difference map, where component values are the scalar differences between the components of the input arrays.

WARNING: The resulting difference values may be negative if the values of the first array are smaller than those in the second array. Therefore, if the two arrays are unsigned integers, it may be possible to underflow the resulting difference map values if the first array is sufficiently smaller than the second array. "Underflow" means that what should be a negative value will end up being a potentially very large value!

Parameters

None

Required Geometry

Not Applicable

Required Objects

Kind Default Name Type Component Dimensions Description
Any Attribute Array None Any Any The first selected Attribute Array. This array's values will be the first argument for the subtraction operation
Any Attribute Array None Any Any The second selected Attribute Array. This array's values will be subtracted from the first selected Attribute Array values

Created Objects

Kind Default Name Type Component Dimensions Description
Any Attribute Array DifferenceMap Same as input arrays Same as input arrays The difference map Attribute Array

Example Pipelines

Please see the description file distributed with this plugin.

DREAM3D Mailing Lists

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