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 check if column exists for averaging		  New Topic  Reply to Topic
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juannim

USA
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Posted - 10/30/2007 :  6:21:06 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Version (Select Help-->About Origin): 7.5
Operating System:xp
I have 51 columns of data, from three replicates of 17 measurements. Columns are named as such:
290a 290b 290c 300a 300b 300c 310a 310b 310c

In some cases, however, one of the letters might be missing- e.g.
290a 290b 290c 300b 300c

I need to average all of the 290 columns, all of the 300's, etc.
How can I check to see if a column exists to modify the averaging loop to move on if there is a missing column? Jonathan

Mike Buess

USA
3037 Posts
Posted - 10/30/2007 :  8:44:43 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Use LabTalk's exist() function...

if( exist(Data1_290c,1)>0 ) {column 290c exists in worksheet Data1 so do something};
else {it does not exist so skip};

Mike Buess
Origin WebRing Member

Edited by - Mike Buess on 10/30/2007 9:20:31 PM
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juannim

USA
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Posted - 10/31/2007 :  09:27:09 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Mike,
Thanks for your help, as usual. What is the meaning of the >0 in the script? Thanks. Jonathan
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Mike Buess

USA
3037 Posts
Posted - 10/31/2007 :  12:47:18 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
quote:
What is the meaning of the >0 in the script?
>0 means greater than zero.

As written, the value of exist() function returns zero if dataset Data1_290c does not exist. If dataset exists the function returns a positive value that depends on if and how it's plotted.

Mike Buess
Origin WebRing Member
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