Carolyn,

The table probably contains row(s) which have no geographical object.  Try:
(In the MapBasic Window:)
Select * from SomeTab where obj into qGoodOnes

Perform the Update on qGoodOnes.

To isolate the other records, use:
Select * from SomeTab where obj into qGoodOnes

These can be done from the Select/SQL dialogs too.

Sam Kome
Sage Software, Inc
www.sagesoft.com
[EMAIL PROTECTED]

-----Original Message-----
From: Carolyn Davies <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Date: Friday, September 17, 1999 7:30 AM
Subject: MI centroid trouble


Hi,

I'm having trouble updating my table so as it contains the centroid 
values for my map. I've carried out this procedure before and not 
had any problems. I'm adding 2 new fields and then updating these 
columns to contain the x and y centroids for each object. It returns 
the message; 
'CentoidX: Could not fetch object from the current row, argument 1.'

I would be grateful if  anyone let me know what this means and how 
to get around it.

Thanks

Carolyn
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