Averaging rows in attribute table QGIS
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1
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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.
qgis field-calculator attribute-table
edited Nov 27 at 13:38
Vince
14.3k32646
asked Nov 27 at 9:36
Guillaume
1065
add a comment |
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.
qgis field-calculator attribute-table
edited Nov 27 at 13:38
Vince
14.3k32646
asked Nov 27 at 9:36
Guillaume
1065
add a comment |
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.
qgis field-calculator attribute-table
edited Nov 27 at 13:38
Vince
14.3k32646
asked Nov 27 at 9:36
Guillaume
1065
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.
qgis field-calculator attribute-table
qgis field-calculator attribute-table
edited Nov 27 at 13:38
Vince
14.3k32646
asked Nov 27 at 9:36
Guillaume
1065
edited Nov 27 at 13:38
Vince
14.3k32646
asked Nov 27 at 9:36
Guillaume
1065
edited Nov 27 at 13:38
Vince
14.3k32646
edited Nov 27 at 13:38
Vince
14.3k32646
edited Nov 27 at 13:38
Vince
14.3k32646
14.3k32646
asked Nov 27 at 9:36
Guillaume
1065
asked Nov 27 at 9:36
Guillaume
1065
asked Nov 27 at 9:36
Guillaume
1065
1065
add a comment |
add a comment |
1 Answer
1
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votes
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4
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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.
answered Nov 27 at 9:45
Stefan_Fairphone
975118
add a comment |
1 Answer
1
active
oldest
votes
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.
answered Nov 27 at 9:45
Stefan_Fairphone
975118
add a comment |
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.
answered Nov 27 at 9:45
Stefan_Fairphone
975118
add a comment |
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.
answered Nov 27 at 9:45
Stefan_Fairphone
975118
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.
answered Nov 27 at 9:45
Stefan_Fairphone
975118
answered Nov 27 at 9:45
Stefan_Fairphone
975118
answered Nov 27 at 9:45
Stefan_Fairphone
975118
answered Nov 27 at 9:45
Stefan_Fairphone
975118
975118
add a comment |
add a comment |
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