parse numbers output not numerical
I am working on data that contains lots of missing values. When reading the csv (or xlsx for that matter) file, it therefore misclassifies many of the attributes as polynomial instead of numeric. I did a parse numbers on the values and when looking in the statistics tab of the output, all attributes indeed show up as numeric.
However, when I want to use those values in a new generated attribute, it says the attributes are not numeric. In the first generate attribute it gives an error, but the calculation still works. However, I cannot add a second generated attribute, because the first one "cannot generate an example data set". I could enter the names of the attributes by heart, but I need to do around the 100 calculations, so that doesn't really work.
I also found this post from 2013 with basically the same problem: http://community.rapidminer.com/t5/RapidMiner-Studio/Output-from-quot-parse-att1-quot-not-numerical/m-p/22455. The answer to the problem is: we are working on it... I was hoping that by now there was a way around this?