Emulating if-then-else construct

KNIME Analytics Platform
1

It seems knime does not have any control flow nodes.  In particular I was searching for a node that will emulate an if-then-else construct.

As an example: I would like to have two chains in my workflow: a high fidelity chain and a low fidelity one.  Depending on the configuration of an if-then-else node you can choose which chain will be run when you start the workflow.

How can I emulate this behaviour with a custom node?  Eg, I could try to pass null for the output port which is non-active?

Cheers

Dirk

 

2

hi dirk,

there is a rule engine under "Misc", have you tried that one? it may be one of those nodes that you have to import [/file/update/]

if there are not many categories you can also use a row splitter, under data manipulation/row/filter.

henk

3

The upcoming 2.3 release will very likely contain switches on the workflow level.

4

Thanks for the replies.  I looked at the rule engine/row filter but it seemed a bit too hackish for me.  Its a feature I can do without for now, I will look forward to 2.3 :)

Cheers

Dirk

5

i forgot to say that there is an if-then-else construction in the math formula node. if you have to process numeric fields, that maybe what you were looking for. otherwise, recode your category string to numeric ones.

henk

6

ooops, wrong post