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"Aggregate package vs custom aggregate functions"
Contributor I
Hi,
i want to use the package "aggregate" to group some record in one, group by one attribute.
I have a problem because i've an attribute named "wind direction" with values [0-360]
i need to use a custom aggregate function instead of simply average that not consider periodicity of grades.
the custom function should make this:
aMin = min(anglesList)
aMax = max(anglesList)
if (aMax - aMin) < 180
return media(anglesList)
else
for a in anglesList
if a < 180 : a += 360
M = media(anglesList)
if M >= 360 : M -= 360
return M
id- angle - value 2
1 - 10 - 20
2 - 150 - 25
3 - 36 - 8
1 - 350 - 18
2 - 225 - 29
3 - 27 - 11
1 - 330 - 24
2 - 14 - 20
3 - 20 - 3
1 - 20 - 3
aggregate should produce this:
1 - 357.5 - 65
there's a possibility to make this???
i want to use the package "aggregate" to group some record in one, group by one attribute.
I have a problem because i've an attribute named "wind direction" with values [0-360]
i need to use a custom aggregate function instead of simply average that not consider periodicity of grades.
the custom function should make this:
aMin = min(anglesList)
aMax = max(anglesList)
if (aMax - aMin) < 180
return media(anglesList)
else
for a in anglesList
if a < 180 : a += 360
M = media(anglesList)
if M >= 360 : M -= 360
return M
id- angle - value 2
1 - 10 - 20
2 - 150 - 25
3 - 36 - 8
1 - 350 - 18
2 - 225 - 29
3 - 27 - 11
1 - 330 - 24
2 - 14 - 20
3 - 20 - 3
1 - 20 - 3
aggregate should produce this:
1 - 357.5 - 65
there's a possibility to make this???
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