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you can specifiy the type of the ParameterType, e.g. ParameterTypeDouble. Then RapidMiner makes sure the value entered is at least numeric. Otherwise, if you want for example to make sure a parameter is between 0 and 1, you can make the operator throw an error when it is not. However, if you want to add some sort of input verification right when the user has entered something, you will need to create one yourself, there is no mechanism in RapidMiner that you could use for that. I suggest having a look at the ParameterType implementations and the PropertyValueCellEditor interace with its implementations and continue from there.
you can specifiy the type of the ParameterType, e.g. ParameterTypeDouble. Then RapidMiner makes sure the value entered is at least numeric. Otherwise, if you want for example to make sure a parameter is between 0 and 1, you can make the operator throw an error when it is not.
However, if you want to add some sort of input verification right when the user has entered something, you will need to create one yourself, there is no mechanism in RapidMiner that you could use for that. I suggest having a look at the ParameterType implementations and the PropertyValueCellEditor interace with its implementations and continue from there.
Regards,
Marco