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Sep 28, 2017 12:27 PM
Hello,
I am trying to perform a mathematical formula on a Roll Up Field. Specifically I have…
- A bunch of records on Table A with FIELD ONE = (Float)
- On Table B I take an Average of the value of FIELD ONE s on Table A which I am doing using a Roll Up Field. This field with be named FIELD TWO.
- On Table C I would like to lookup the FIELD TWO from Table B and then multiply it by a factor of 1.2. Whenever I try to do this, every cell prints #ERROR!.
I have tried using a Lookup Field and various types of Average/ Array Field Formats.
I have also tried to use the “value()” function in my formula on Table C however it is not working.
Does anyone know how to make this work?
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Sep 28, 2017 12:56 PM
You may have to add a second formula field on Table B with the value() function and then lookup that field on Table C.
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Sep 28, 2017 06:58 PM
Your scenario works fine for me. If you compare your base with this one, you should be able to determine what went wrong.
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May 10, 2018 01:54 PM
I am having the same problem. I have tried the value formula a second time, and still no dice. Just error messages.
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May 11, 2018 06:14 AM
You are probably running into conflict with the way Airtable handles lookups: All lookups (AFAIK) are returned as arrays — even those with only a single item, and even though Airtable currently doesn’t provide any array functions.
Assuming the lookup field you wish to reference in a formula is supposed to be a numeric value, there are typically two ways around this problem.
-
Cast the array to a string (text) and then use
VALUE()
to convert it to a number:VALUE({NumberIWant}&'')
-
Change the lookup field to a rollup field and use something like
MAX(values)
orSUM(values)
as the aggregation function. (For that matter, I think you could just usevalues
, but since I don’t know exactly how your base is breaking, I can’t test and verify possible solutions.)
Either of these approaches should work.
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May 26, 2018 05:29 PM
Hi W Vann Hall! Thanks for your replies on a few questions I’ve had. Sorry for not acknowledging them yet–I’ve got 3 little ones, so my concentration times are limited! Anyway, I’m trying to process your suggestion and struggling to understand, as I’ve tried using Value() with continued error messages. :frowning: I’m attaching a screenshot below, in which I attempted to have the name field reference a currency field and a unit type field. Ideally it would say, “TP: $0.45/double rolls.” When I tried to adjust the number by starting with a VALUE function, it gave me error messages. Any ideas how to overcome this and limit it to two places?
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May 27, 2018 07:24 AM
Just what you need! More long posts to read!
To answer your last question first, it turns out formatting currency fields converted to strings can be a surprisingly complex chore…
To answer your first question, I dunno: Could you PM me a link to your base so I can see what might be causing your errors. To do so, select ‘Share’ > ‘Create a shared link to the whole base’ > ‘Private read-only link’, and message me the generated URL.
In the meantime, often a NaN
— ‘not a number’ — result indicates one is trying to solve a formula in which one or more of the expressions (frequently the divisor) is null. Check to make sure all the components of your price-generating formula exist; that is, if {Price}
is defined as {Cost}/{Quantity}
and is returning NaN
, make sure both {Cost}
and {Quantity}
have numeric values assigned to them.
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