Expression to Select Even or Odd Rows in QGIS shapefile

[sri...@tumut.nsw.gov.au]

I have used the Create Points Along Lines PlugIn to create a new point layer with points at 10m intervals along the edge of a street. I have used the Update Column command and @rownum expression to create and populate a RowNumber column. I now want to select and retain only the even values. Can someone please help me out with an Expression for this? I want to use to even numbers as possible address points in a street where addressing is incorrect. And conversely on the other side will use an expression for odd rows. Thanks.

[Phil (The Geek) Wyatt]

Hi sridley,

 

try selecting with an expression like RowNumber % 2 = 0 - this should select all the even rows and then you can save that as a new file RowNumber % 2 <>0 should get all the odd rows

 

Cheers - Phil

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[sri...@tumut.nsw.gov.au]

Thanks Phil, it worked perfectly. I appreciate your help. Sue

On Wednesday, November 25, 2015 at 12:02:43 PM UTC+11, tastrax wrote:

Hi sridley,

 

try selecting with an expression like RowNumber % 2 = 0 - this should select all the even rows and then you can save that as a new file RowNumber % 2 <>0 should get all the odd rows

 

Cheers - Phil

 

 

From: australian-qg...@googlegroups.com [mailto:australian-qgis-user-gr...@googlegroups.com] On Behalf Of sri...@tumut.nsw.gov.au
Sent: Wednesday, 25 November, 2015 10:19 AM
To: Australian and New Zealand QGIS User Group
Subject: [Aus-NZ-QGIS-group] Expression to Select Even or Odd Rows in QGIS shapefile

 

I have used the Create Points Along Lines PlugIn to create a new point layer with points at 10m intervals along the edge of a street. I have used the Update Column command and @rownum expression to create and populate a RowNumber column. I now want to select and retain only the even values. Can someone please help me out with an Expression for this? I want to use to even numbers as possible address points in a street where addressing is incorrect. And conversely on the other side will use an expression for odd rows. Thanks.

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