Ik moet automatisch een veld berekenen op basis van waarden uit vorige rijen

Question

<\/HEAD>Ik moet automatisch een veld berekenen op basis van waarden uit vorige rijen zodat zodra het totaal van alle vorige rijen groter is dan 450 en kleiner dan 500, de volgende rij begint te tellen vanaf 0 of het saldo van wat de vorige rij groter dan 500 maakte, ik ben erin geslaagd mijn formule op te nemen maar deze werkt binnen een enkele rij, d.w.z. (${No of Persons in Sampled Building} + ${Estimated No of Persons in Residential Building}) de uitvoer zou de waarde voor het veld genaamd Estimated Population maken <\/P><\/BODY><\/HTML>

eric3918esridot · Answer

Olaniyan,

I want to make sure I understand your question.  You have a survey question (field/column) and you want to automatically calculate the value of that column based on the answers of previously submitted surveys (rows)?  To my knowledge Survey 123 does not support reaching back into the feature service to pull out previous surveys and sum the values of a field.  This is due to the fact that Survey123 is working in an offline state storing the surveys until you upload the results.

I can reach back into previous questions in the current survey.  So if your survey has three questions, Number of persons sampled building , and number of persons in residential building I can sum those values and pre-populate the third question called estimated population and hide it from  the survey.

So my question to you are you trying to do this the first way or the second way.  To do this the second way,  refer to this link which explains how to create a calculation from previous questions using the XLSforms Calculation Column... Survey123 for ArcGIS support for XLSForm