Hi @TIZIZ -
The Column Expresssions node, new to KNIME 3.6, is available in the KNIME Expressions extension.
Hi @TIZIZ -
The Column Expresssions node, new to KNIME 3.6, is available in the KNIME Expressions extension.
Hi @ScottF,
thank you for your help.
if I upgrade to the new version 3.6, I may loose my workflows and data ? .
Bests Regards.
Upgrading shouldn’t affect anything negatively, but if you want to be 100% safe, you can always back up your workspace folder prior to the upgrade.
Hi!
In group by node in each loop iteration you need different Row. So first time it is Row0, then Row1, Row2…
You will get this by controlling aggregation column name with flow variable. When you use this loop there is automatically created flow variable currentColumnName with name of current column in loop. Use it.
In Rule engine node if you use TRUE => 1 you will add (or replace depending on node configuration) column with all 1s. This way you can use TRUE => “flow variable name” that holds number of rows.
Br,
Ivan
Hi !
thank you for your attention!
Can you explain your logic because here we compare numbers and I need to compare ( String) because all columns there type is String.
And what I should do in the first 'Rule Engine’Node ,
I don’t understand how to add numbers ?? because here for the first time I have “Row0” ( I know that the loop will treat for each iteration)
it a little bit hard for me to understand this because is the first time for me that i’m using these concepts.
Thank you again.
Bests Regards.
Hi!
My idea is to compare number of unique values in row with total number of values in that row so it doesn’t matter if you have numeric or string values. If the number is same then all values in that row are unique so you will put 0. Else you put 1 because there is less unique values then the total number of values in row meaning you have one or more values repeated.
In this Rule engine node you add following rule:
TRUE => Number of Rows (double click from Flow Variable list)
Br,
Ivan
Hi again !
I will have to come back to you on that again ,
1- I haven’t finshed the workflow yet, and I wanted to test the Loop operation. I get that Error in the Group By :
Thank you .
Bestes Regards.
Hi @TIZIZ -
To get the Column Expressions node, you have to install the KNIME Expressions extension, shown here:
No problem. You should go through some tutorials regarding Knime. That is good (mandatory) for start. Then creating workflows will be easier and more fun
Here is a one for flow variables. Flow variables are controlled on flow variables tab
Br,
Ivan
Hi ScottF,
After upgrading to knime 3.6, I wanted to add the extensions of “Knime Expressions” and I get this Error:
PS: I don’t have the probleme of Firwall.
How I can fix it Please!
@ipazin wish one of Attribute that i have to add the CurrentColumnName variable in these parametrs:
Hi @TIZIZ!
Click a little bit and you will find it
As you are doing manual aggregations then it is under aggregationColumn --> columnNames
Here 0 represents first column or in your case only column you have added on Manual Aggregation tab.
Regarding column expressions node it is used only to calculate difference and you do not have to use flow variables here. You just subtract two columns. But first install this node, read its description and you can use Knime NodePit (https://nodepit.com/category/) to find example workflows with it
Br,
Ivan
Yes
Ivan
Thank you very much for your help!
Here I’m using the column expressions, I choose the function “equals” , and I it seems not the right one :
what do you think ?.
Br.
You can use column(0) which is the first column and column(1) which is the second column and calculate difference with minus operator.
that’s what I have tried too but the expressions seems not the right one !!!
:’(
And how the names of columns will changes for each iteration with loop ( Row0,Row1,Row3,…) even I’m not using in this node the flow variable ?!!
@ipazin , Please help : (
Br.
As I said you should use column(0) and column(1)…
Ivan
heey @ipazin,
I could solve the probleme thank you !
now I have a problème in the Loop End, and the error is the console is :
may be the probleme is in the second rule Engine node that I configurate in that way :
thank you .
BR.
Have you used column filter node to leave only column result?
This error means you have different column types in different iterations…
Ivan