# Sum & validation in multiple numerical input question

11 months 3 weeks ago #173247 by vzyldd
Hi, need a little guidance please.

I'm using a multiple numerical input question but needs to validate the totals of the different sub-questions individually.

I need to check that the answer in sub-question 1 equals the sum of sub-question 2 and 3. Check that sub-question 4 is not more than the answer in sub-question 1.

I tried the validation in the sub-question validation box but somewhere I'm missing the target. I've used the following:
sum(Q2_4)=<sum(Q2_1) but are not sure if I am on the right track.
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11 months 3 weeks ago #173255 by tpartner
I would think the question validation equation would be something like:

`{Q2_1 == sum(Q2_2, Q2_3) && Q2_4 <= Q2_1}`

Cheers,
Tony Partner

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11 months 3 weeks ago - 11 months 3 weeks ago #173257 by Joffm
Hi,
yes, you are.

sum(Q2_4)=<sum(Q2_1)

But why do you "sum"? This are single fields.

So it is something like:
(Q2_1==sum(Q2_2,Q2_3) AND (Q2_1>=Q2_4)

And the tip could be:
{if(Q2_1!=sum(Q2_2,Q2_3),"Sum not equal Total","")}
...

But you have to add something that allows empty fields. Otherwise you will see the red border if "Total" is filled, but "boys" and "girls" still empty. Of course the sum is not equal in this case.

Best regards
Joffm

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Last edit: 11 months 3 weeks ago by Joffm.
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1 month 3 days ago #186706 by l1bxr02
Hello there
This is what I am trying to do.
4.A.(1)
(2)
4.B. (1)
(2)
(3)
4.C. Sum of 4.A(1) through 4.B(3)
Is this equation correct? Am I missing something?

{4.C = sum(4.A.(1), 4.A.(2)) AND sum(4.B.(1),4.B.(2),4.B.(3)}

1 month 3 days ago #186711 by Joffm
Now you ask the same question in three really outdated posts.

Would be better you open a new post with an attached sample of your survey (*.lss) with the relevant questions.
I assume 4A and 4B are two questions of type multiple numerical input.

And if you'd read the manual here
https://manual.limesurvey.org/Expression_Manager_-_presentation#Qcode_variable_naming
and
https://manual.limesurvey.org/Expression_Manager_-_presentation#The_reserved_.22this.22.2C_.22self.22.2C_and_.22that.22_variables

"Here are the details of how to construct a Qcode (and access some properties) by question type. In general, Qcodes are constructed as:
QuestionCode . '_' . SubQuestionID . '_' . ScaleId"

you know that your equation has to look like this:
{sum(QuestionCode_SubQuestionCode1,QuestionCode_SubQuestionCode2,QuestionCode_SubQuestionCode3,...)}

If you can use the "that"-variable you can shorten to
{sum(that.QuestionCode)}

Joffm

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