Averaging rows in attribute table QGIS











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I have two rows with monthly rain run off per watershed as in the picture below.



I'd like to obtain the average runoff between may and august for basin 218187 and 218265 (note that basin 218187 will be 0 but the attribute table contains more rows). To do that I've created a new field but I'm struggling to write the code in the field calculator.



enter image description here






qgis field-calculator attribute-table







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    up vote
    1
    down vote

    favorite












    I have two rows with monthly rain run off per watershed as in the picture below.



    I'd like to obtain the average runoff between may and august for basin 218187 and 218265 (note that basin 218187 will be 0 but the attribute table contains more rows). To do that I've created a new field but I'm struggling to write the code in the field calculator.



    enter image description here






    qgis field-calculator attribute-table







    share|improve this question


























      up vote
      1
      down vote

      favorite









      up vote
      1
      down vote

      favorite











      I have two rows with monthly rain run off per watershed as in the picture below.



      I'd like to obtain the average runoff between may and august for basin 218187 and 218265 (note that basin 218187 will be 0 but the attribute table contains more rows). To do that I've created a new field but I'm struggling to write the code in the field calculator.



      enter image description here






      qgis field-calculator attribute-table







      share|improve this question















      I have two rows with monthly rain run off per watershed as in the picture below.



      I'd like to obtain the average runoff between may and august for basin 218187 and 218265 (note that basin 218187 will be 0 but the attribute table contains more rows). To do that I've created a new field but I'm struggling to write the code in the field calculator.



      enter image description here






      qgis field-calculator attribute-table




      qgis field-calculator attribute-table






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Nov 27 at 13:38









      Vince

      14.3k32646




      14.3k32646










      asked Nov 27 at 9:36









      Guillaume

      1065




      1065






















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          You have to select "Update existing field" > AverageRO and then type the following into the expression field:



          ("runoff_may" + "runoff_jun" + "runoff_jul" + "runoff_aug")/4


          This will give you the arithmetic mean of the runoff values.






          share|improve this answer





















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            1 Answer
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            active

            oldest

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            1 Answer
            1






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes








            up vote
            4
            down vote



            accepted










            You have to select "Update existing field" > AverageRO and then type the following into the expression field:



            ("runoff_may" + "runoff_jun" + "runoff_jul" + "runoff_aug")/4


            This will give you the arithmetic mean of the runoff values.






            share|improve this answer

























              up vote
              4
              down vote



              accepted










              You have to select "Update existing field" > AverageRO and then type the following into the expression field:



              ("runoff_may" + "runoff_jun" + "runoff_jul" + "runoff_aug")/4


              This will give you the arithmetic mean of the runoff values.






              share|improve this answer























                up vote
                4
                down vote



                accepted







                up vote
                4
                down vote



                accepted






                You have to select "Update existing field" > AverageRO and then type the following into the expression field:



                ("runoff_may" + "runoff_jun" + "runoff_jul" + "runoff_aug")/4


                This will give you the arithmetic mean of the runoff values.






                share|improve this answer












                You have to select "Update existing field" > AverageRO and then type the following into the expression field:



                ("runoff_may" + "runoff_jun" + "runoff_jul" + "runoff_aug")/4


                This will give you the arithmetic mean of the runoff values.







                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Nov 27 at 9:45









                Stefan_Fairphone

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