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How to replace a certain column value by MISSING_NOMINAL ?

User: "alain"
New Altair Community Member
Updated by Jocelyn
I have an Excel file that contains the word NULL in certain cells to indicate a missing value.
I want to replace that word by MISSING_NOMINAL, so RapidMiner can interprete it correctly as a missing value.

What operator can do this?

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    User: "kypexin"
    New Altair Community Member
    Accepted Answer
    Hi @alain

    I want to replace that word by MISSING_NOMINAL, so RapidMiner can interprete it correctly as a missing value
    The solutions offered here are replacing one string with another, but is that what you really need? 
    There's also an operator called DECLARE MISSING VALUE which will actually replace specified values with real missing values (will be displayed as ?) and they will be interpreted as such by RapidMiner.