Desktop Survival Guide
by Graham Williams

Delete Ignored

As an example, suppose we have loaded our familiar audit dataset. In the Data tab choose to set the role of Age, Employment, Education, Marital, and Occupation to be Ignore, and then click the Execute button for these new roles to take effect. In the R console window use the object.size to determine the current amount of memory the dataset is taking up:

>  object.size(crs$dataset)
[1] 128904

Now, back in the Rattle window, navigate to the Transform tab and choose the Cleanup option. The Delete Ignored sub-option is the default. Click the Execute button to remove the columns that we marked as Ignored. Now in the R console, check how much space the dataset is taking up:

> object.size(crs$dataset)
[1] 84216

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