| Row Wise Sum [message #1926] |
Tue, 13 June 2023 10:46  |
amorrison
Messages: 38
Registered: March 2016
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Member |
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Hi,
I'm trying to do a row wise sum of several columns within a Row to get a total value. In some cases there will be a empty value within a particular row. I've tried both sum(x,y,z) and also (x+y+z), this works fine for rows that are fully populated but for rows that have a empty value I get 'NAN' returned. Can I force it to ignore this and give me the sum even when there is a empty value?
In addition, is it possible to get a count of the populated values within the row? So for example, within the row 4 out of 5 of the columns have data, the number I would like to return is "4".
Just in case this is the issue, I am using an if statement to generate the numbers with an initial if(isempty(var),"","Do something else").
Many thanks,
Angus
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| Re: Row Wise Sum [message #1927 is a reply to message #1926] |
Tue, 13 June 2023 20:49  |
nbehrnd
Messages: 224
Registered: June 2019
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Senior Member |
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Dear Angus,
to answer the first question, you need a placeholder which either returns `0` (if there is nothing in the cell), or the value of the cell (if the cell contains an entry acceptable for an addition); `replaceempty` is suitable here. For the second question, you already tap against a good door; you now need to know how to negate a Boolean in DataWarrior's syntax.
For the purpose of illustration, I attach a minimal working example below. Departing from a small library of random molecules, DataWarrior computes the number of H-Donors and H-Acceptors. Manually added -- leaving some gaps is intentional -- two additional columns with manual entries, `counter_a` and `counter_b`. The `special_sum` then
HAcceptors + HDonors + replaceempty(counter_a, 0) + replaceempty(counter_b, 0)
!isempty(HAcceptors) + !isempty(HDonors) + !isempty(counter_a) + !isempty(counter_b)
With regards,
Norwid
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