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How to handle the Precision Lost Error

danielkresina
9 - Comet

I'm trying to load some data from CSV files that have numbers with very high precision.  Due to other reasons, I have to load the data as text fields and then convert it to numbers in my workflow.  Whenever I try to convert the string values to numbers, I get a warning at runtime that the numbers "had more precision than a double. Some precision was lost."  This occurs no matter what numeric datatype I try to use.

I'm fine with rounding these rediculously precise numbers, but I'd like to supress the warning message somehow.  I tried explicityly using the ROUND function, but that doesn't work since I need to convert the text to numbers anyway before the round function can be used so I still get this error.

rtaImage (5).png

Any ideas?  Thanks.

18 REPLIES 18
cbridges
11 - Bolide

Thank you @AdamR_AYX for reducing my conversion errors from 100 + to only 1! My numbers are LAT/LONG and my error now is "ConvError: Create Points (37): LAT: A value was out of range and no point was created."

Any suggestions?

 

(I have a personal mission to have no conversion errors - not because I care about rounding, but because they're annoying)

@thizviz
cbridges
11 - Bolide

Quick update @danielkresina - turns out my original issue had nothing to do with rounding. I had null values in my raw data and didn't realize I could / needed to convert those to zeroes before proceeding. Solved all my problems in that workflow! Shout out to @BlytheE for that gold nugget!

@thizviz
AdamR_AYX
Alteryx Alumni (Retired)

So you will want to put a filter before the Create Points tool and filter off any out of range latitudes with the following formula

 

[lat] <= 90 && [lat] >= -90

 

then you just need to decide what to do with the records that come out of the false side

Adam Riley
https://www.linkedin.com/in/adriley/
cbridges
11 - Bolide

That works perfectly! Thanks!

@thizviz
cbridges
11 - Bolide

And, it detected an instance where lat and long were reversed! Well done!

@thizviz
Jasers
6 - Meteoroid

What if you want to keep the precision?  I have a crazy long number in string format like 568.1500244140625 that I get from an api feed, but when I use tonumber, it rounds it.  How do I keep the precision?  After using tonumber, it goes to 568.15.

RodL
Alteryx Alumni (Retired)

Testing out your number, I used a formula tool and changed the Data Type to FixedDecimal with 23.18 as the size.

I still got the conversion message, but it seems the entire number came through.

Jasers
6 - Meteoroid

I think that would work.  Thanks!!

jpburrowes
5 - Atom

Thanks for the suggestion to change the data type to fixed decimal RodL. This resolved a problem I was having with a particular longitude value

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