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I have a an attribute table that does not have a raster value and is joined to another table that does. How do I reclassify the values in the attribute table?

For example, in column B, I'd like all values <5 to reflect the value 1. How do I do this classification?

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    Can't you create a new column and use field calculator for that? – caiohamamura Jul 19 '16 at 0:57
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If you are working with a shapefile attribute table, you can export the shapefile with its joined table to a new shapefile, and the joined table will become permanent inside the new shapefile's attribute table. Next, add a new field of type integer and use the Field Calculator. Then you can write the following python code following Calculate Field examples, as follows:

Parser:
Python

Expression:
Reclass(!Column_B!)

Code Block:
def Reclass(Column):
  if Column < 5:
    return 1
  else
    return 2

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