I'm new to Knime and would like to sum 2 colums with numeric values(for many of you this is easy task) and output the results into 3rd empty column. Is there a procedure in KNIME like in Excel (with functions) or should I use nodes like Java Snipet or Math Formula. I've tried to manage this operation by Java Snipet and Math Formula( i've read the whole forum about similar question) but I think without success. I'm not just yet familiar with all options and power KNIME can provide.

Sorry if this is a repeated question, but I'm breaking my head over this, so any help would be very appreciated.

JohnK - When you say you had no success what exactly do you mean. Were there any error messages in the console that would tip you off to the problem?

If you have Java on your machine I'd suggest the Java Snippet node. Just make sure your syntax is correct. just insert into the method body:

return $Col1$+$Col2$;

Of course, replace Col1 and Col2 with your column names. This should do the trick. just make sure your syntax includes 'return' at the beginning and the semi-colon ';' at the end. You can then assign the result to a new column or replace the value of an existing column.

Is it true that Math Formula node can process only one column at time? So if I have to modify/calculate N columns I must use N Math Formula nodes? Thanks!