rows - remove IDs that occur x times R -


i have df , remove people have less x amount of rows in df. e.g., in toy example, retain people have >= 5 rows. 

df    names  fruit 4   john   kiwi 7   john  apple 9   john banana 13  john orange 14  john  apple 2   mary orange 5   mary  apple 8   mary orange 10  mary  apple 12  mary  apple 1    tom  apple 3    tom banana 6    tom  apple 11   tom   kiwi

example output

df    names  fruit 4   john   kiwi 7   john  apple 9   john banana 13  john orange 14  john  apple 2   mary orange 5   mary  apple 8   mary orange 10  mary  apple 12  mary  apple

thanks in advance!

you can use table this:

df[df$names %in% names(table(df$names))[table(df$names) >= 5],]

-

Popular posts from this blog

Apache NiFi ExecuteScript: Groovy script to replace Json values via a mapping file -

i working apache nifi 0.5.1 on groovy script replace incoming json values ones contained in mapping file. mapping file looks (it simple .txt): header1;header2;header3 a;some text;a2 i have started following: import groovy.json.jsonbuilder import groovy.json.jsonslurper import java.nio.charset.standardcharsets def flowfile = session.get(); if (flowfile == null) { return; } flowfile = session.write(flowfile, { inputstream, outputstream -> def content = """ { "field1": "a" "field2": "a", "field3": "a" }""" def slurped = new jsonslurper().parsetext(content) def builder = new jsonbuilder(slurped) builder.content.field1 = "a" builder.content.field2 = "some text" builder.content.field3 = "a2" outputstream.write(builder.toprettystring().ge...
Read more

node.js - How do I prevent MongoDB replica set from querying the primary? -

read-operations-only: is there way have mongodb replica set, make mongodb instance on box connected to, mongodb gets queried? i have 3 ec2 instances behind aws load balancer. on each ec2 instance runs mongodb, part of replica set. i have express endpoints on nodejs , connect replica set follows mongodb.mongoclient.connect('mongodb://1.1.1.1,2.2.2.2,3.3.3.3.', function (err, db) { if (err) { complete('{}'); } else { i distribute load of queries evenly across 3 instances of mongodb replica set instead of default having queries routed ec2 instance primary mongodb defined, because destroys point of load balancer (which balance load of queries across 3 instances evenly). my understanding when connecting mongodb replica set, primary instance selected unless primary instance down, , therefore purpose of every secondary instance serve backup. in example people call hot,cold,cold. because there 2...
Read more