Dear Users,
as far as I know the picture i attached is used for creata sample-variable in case I want to use, but I cannot figure out, how to use it exactly. Could someone help me?
Thank you
Hello @HarryKl,
in your example you created a flow variable named myExpression (type String; defined by letter before configuration name - s in this case). This flow variable will have value of the expression written in Math Expression tab. So lets say you want absolute of your column1 then your expression will be abs($column1$) and exactly that will be the value of your newly created flow variable.
In contrast if you want to use this flow variable in another node then you’ll assign it in the middle column like this in some downstream node:
For more info check KNIME documentation on flow variables:
Hope this helps!
Br,
Ivan
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The dropdowns in that tab are your best friend! To use a variable you’ve already made (like a file path or a date), just find the parameter you want to change and select your variable from the list. The text box is just if you want to ‘export’ the current manual setting into a new variable for nodes further down the line. Check out the ‘Node Monitor’ while you do it - it makes it much easier to see the values changing in real-time.