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I have to create a "sum if" by column with multiple criteria.

I've tried this: 

b <- DB.all %>% group_by(Family) %>% summarise(x)

But it doesn't work.

How can I do it?

Scarabee
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Tyu1990
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    It's not easy to understand what you want to do, could you provide an example? You should read this:[How to make a great R reproducible example](http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example/5963610#5963610) – Scarabee Oct 30 '16 at 19:28
  • do you possibly want `DB.all %>% group_by(Family) %>% summarise_all(sum)` ... ? – Ben Bolker Oct 30 '16 at 22:50
  • If python helps, knock. –  Oct 30 '16 at 22:51
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    If you want to take a sum, then you need to use the `sum` function somewhere... – Gregor Thomas Oct 30 '16 at 22:53

1 Answers1

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Try this:

library(dplyr)
b <- DB.all %>% group_by(Family) %>% summarise(sum(x))
Scarabee
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