title: Update a subset of dataframe rows and columns from another dataframe
body: <pre><code>df1 &lt;- data.frame(w = 1:4, x = c("a", "b", "b", "c"), y = NA)
  df1$y[df1$x == "c"] = 1
  df2 &lt;- data.frame(x = c("a", "b"), y = 1:2, z = 3:4)
  </code></pre>
  
  <p>I want to update df1 with the values in df2 for matching rows, including all df2 columns.</p>
  
  <p>Expected result:</p>
  
  <pre><code>df1
    w x  y  z
  1 1 a  1  3
  2 2 b  2  4
  3 3 b  2  4
  4 4 c  1 NA
  </code></pre>
  
  <p>Here's my attempt:</p>
  
  <pre><code># add missing columns from df2 to df1
  df1[setdiff(colnames(df2), colnames(df1))] &lt;- NA
  # update values in df1 from df2 for matching x
  df1[df1$x %in% df2$x, colnames(df2[,-1])] &lt;- df2[match(df1$x, df2$x),-1]
  </code></pre>
  
  <p>This doesn't work because df2[match(df1$x, df2$x),-1] also includes mismatches. What's the right way to do this? (My actual dataframes have many more rows and columns.)</p>
  
  <p>EDIT1: Upon request, the example does not represent the full complexity of my actual data. In real life, I am dealing with df offices (df1) and results (df2). Column "x" is "address".</p>
  
  <pre><code>colnames(offices)
   [1] "org_order"                   "organizations.api_path"      "type"                       
   [4] "uuid"                        "name"                        "street_1"                   
   [7] "street_2"                    "postal_code_o"                 "city"                       
  [10] "city_web_path"               "region"                      "region_code2"               
  [13] "region_web_path"             "country_o"                     "country_code2"              
  [16] "country_code3"               "country_web_path"            "latitude"                   
  [19] "longitude"                   "created_at"                  "updated_at"                 
  [22] "address"                     "administrative_area_level_1" "administrative_area_level_2"
  [25] "country"                   "locality"                    "neighborhood"               
  [28] "postal_code"               "route"                       "street_number"              
  colnames(results)
   [1] "address"                     "administrative_area_level_1" "administrative_area_level_2"
   [4] "country"                     "locality"                    "neighborhood"               
   [7] "postal_code"                 "route"                       "street_number"              
  [10] "subpremise"                  "postal_code_suffix"          "premise"                    
  [13] "political" 
  </code></pre>
  
  <p>Note that this is the picture at this point in time. I expect df results to add more columns (it is updated via Google Maps API which returns variable fields according to location).</p>
  
  <p>EDIT2: Here is sample data from df offices and results.</p>
  
  <pre><code>structure(list(org_order = c("1", "3", "4", "8", "9", "10", "11", 
  "11", "13", "13", "14", "15", "16", "18", "21", "23", "24", "25", 
  "26", "27"), organizations.api_path = c("organizations/care1st-health-plan-arizona", 
  "organizations/telecommunications-and-information-administration", 
  "organizations/multimatecollection-com", "organizations/ion-holdco", 
  "organizations/itris-bv", "organizations/crius-energy", "organizations/uwc-mahindra-college", 
  "organizations/uwc-mahindra-college", "organizations/ustech-discovery", 
  "organizations/ustech-discovery", "organizations/play-park-structures", 
  "organizations/wings-rotors", "organizations/attractive-world", 
  "organizations/bigtoys", "organizations/intercontec-produkt-gmbh", 
  "organizations/elitesingles", "organizations/rumi-x-limited", 
  "organizations/gt-grandstands", "organizations/new-health-capital-partners", 
  "organizations/urban-media-2"), type = c("Address", "Address", 
  "Address", "Address", "Address", "Address", "Address", "Address", 
  "Address", "Address", "Address", "Address", "Address", "Address", 
  "Address", "Address", "Address", "Address", "Address", "Address"
  ), uuid = c("e28deae838eb745ab093bb3d2f66963a", "ae150251316913fd72a1ba9df18bd686", 
  "d49e135e7b61d01acf6609e1c5c1a34d", "359399c4f6db344f530897caabce666e", 
  "2b4a469b217e5090611a539d952412f3", "3939cfa28f2191535bcdaf4297bfa488", 
  "86620bc9b675150a847496bcfbb8f6b9", "ee869cc495e84ebdbbbbd6db0ed5d3c0", 
  "f31c6e197494192ec47bcb36d14bc206", "2fb8855d0bcccde661aacbbf69d92a3e", 
  "724967633f0be037df09bf63e8bd932d", "8d765e1b0111298f2e295883ac0c1f52", 
  "ea0cd535b2a113b9c7d1cbec466963eb", "a7d69835d7abdbee8d28c77e9c54f176", 
  "243b70fedc6ff9f6b68bb1ae1cb5f5a1", "7cec7f51b87fff47acf74a0424c88d30", 
  "e1c4108f8e4d902ed3524e98418cb157", "666dffa11b2de8aa35307a35d19ec117", 
  "d5d56654e892d46c303deebd9b71aaaa", "deb420cf0a669897e0058ab854e928bc"
  ), name = c("Headquarters", "Headquarters", "Delhi", "Headquarters", 
  "Headquarters", "HQ", "Israel Office", "Headquarters", "Israel Office", 
  "Headquarters", "Headquarters", "Israel Office", "Headquarters", 
  "Headquarters", "HQ", "Headquarters", "Headquarters &amp; Showroom", 
  "Headquarters", "Headquarters", "Israel Office"), street_1 = c("2355 E. Camelback Road", 
  "1401 Constitution Ave NW", "", "80 State Street 7th Floor", 
  "Spray Gaarde 46", "1055 Washington Blvd., 7th Floor", "", "Village Khubavali, PO Paud Taluka Mulshi", 
  "", "231 Lagrange Street", "401 Chestnut St", "st. ha Rav Bar Shaul 6", 
  "", "7721 New Market Street", "Bernrieder Str. 15", "", "UNIT 1801, 18/F WAGA COMMERCIAL CENTER", 
  "2810 Sydney Road", "1350 Avenue of the Americas", ""), street_2 = c("Suite 300", 
  "", "", "", "", "", "", "", "", "", "Suite 410", "", "", "", 
  "", "", "99 WELLINGTON ST, CENTRAL,", "", "9th Floor", ""), postal_code_cb = c("85016", 
  "20230", "", "12207", "03436", "06901", "", "412 108", "", "02132", 
  "37402", "7625149", "", "98501", "94559", "", "", "33566-1173", 
  "10019", ""), city = c("Phoenix", "Washington", "", "Albany", 
  "Nieuwegein", "Stamford", "", "Pune", "", "Boston", "Chattanooga", 
  "Rehovot", "Paris", "Olympia", "Niederwinkling", "Dover", "Hong Kong", 
  "Plant City", "New York", ""), city_web_path = c("location/phoenix/e55cf011f3c746498d0d801bc399dc52", 
  "location/washington/09d220d540bacd296f7a5035ff6e6bef", "location/india/44048bf7db640d7adb20fd3c1ebf47b0", 
  "location/albany/b40478e7b38920051a2a0f501b6e8c65", "location/nieuwegein/93f71c3141f8b16e539839308acd911e", 
  "location/stamford/01272fa9253161fb0b1e69fe0fa8a53c", "location/israel/ab89e1a9013f82613b5f60487350334d", 
  "location/pune/2c69941daa1ea666db3cb74f2029ae62", "location/israel/ab89e1a9013f82613b5f60487350334d", 
  "location/boston/9898e533996b05148cc5302f60454c02", "location/chattanooga/9ecb7425cc53be56a353c7a127bf2f56", 
  "location/rehovot/fd22cd6db48f2c192068a1bc99853c08", "location/paris/5805284c00a4f0aab8115843398ff2bb", 
  "location/olympia/b289b456f00ca6c0536b2032da46985f", "location/niederwinkling/026a83aec4e324d209cd3e1b257b55d5", 
  "location/dover/796562878525d2957e1dc10a32a5e13e", "location/hong-kong/ad27df91c866cb08f3b624121637bf69", 
  "location/plant-city/646eec50d4fc27131241e0bebdae3673", "location/new-york/d64b7615985cfbf44affaa89d70c4050", 
  "location/israel/ab89e1a9013f82613b5f60487350334d"), region = c("Arizona", 
  "District of Columbia", "", "New York", "Utrecht", "Connecticut", 
  "", "Maharashtra", "", "Massachusetts", "Tennessee", "HaMerkaz", 
  "Ile-de-France", "Washington", "Bayern", "Delaware", "Hong Kong Island", 
  "Florida", "New York", ""), region_code2 = c("AZ", "DC", "", 
  "NY", "9", "CT", "", "16", "", "MA", "TN", "2", "A8", "WA", "2", 
  "DE", "", "FL", "NY", ""), region_web_path = c("", "", "", "", 
  "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", ""
  ), country_cb = c("United States", "United States", "India", 
  "United States", "The Netherlands", "United States", "Israel", 
  "India", "Israel", "United States", "United States", "Israel", 
  "France", "United States", "Germany", "United States", "Hong Kong", 
  "United States", "United States", "Israel"), country_code2 = c("US", 
  "US", "IN", "US", "NL", "US", "IL", "IN", "IL", "US", "US", "IL", 
  "FR", "US", "DE", "US", "HK", "US", "US", "IL"), country_code3 = c("USA", 
  "USA", "IND", "USA", "NLD", "USA", "ISR", "IND", "ISR", "USA", 
  "USA", "ISR", "FRA", "USA", "DEU", "USA", "HKG", "USA", "USA", 
  "ISR"), country_web_path = c("", "", "", "", "", "", "", "", 
  "", "", "", "", "", "", "", "", "", "", "", ""), latitude = c("", 
  "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", 
  "", "", ""), longitude = c("", "", "", "", "", "", "", "", "", 
  "", "", "", "", "", "", "", "", "", "", ""), created_at = c("1475743389", 
  "1475899280", "1475743519", "1475899256", "1475742451", "1475742715", 
  "1475742786", "1475742171", "1475741845", "1475741660", "1475899240", 
  "1475741599", "1475741472", "1475899218", "1475741445", "1475741067", 
  "1475742388", "1475899207", "1475740101", "1475740590"), updated_at = c("1475743390", 
  "1475899280", "1475743519", "1475899257", "1475742451", "1475742715", 
  "1475742786", "1475742171", "1475741845", "1475741660", "1475899240", 
  "1475741599", "1475741472", "1475899218", "1475741445", "1475741067", 
  "1475742388", "1475899207", "1475740101", "1475740590"), address = c("2355 E. Camelback Road Suite 300 85016 Phoenix Arizona", 
  "1401 Constitution Ave NW  20230 Washington District of Columbia", 
  "", "80 State Street 7th Floor  12207 Albany New York", "Spray Gaarde 46  03436 Nieuwegein Utrecht", 
  "1055 Washington Blvd., 7th Floor  06901 Stamford Connecticut", 
  "", "Village Khubavali, PO Paud Taluka Mulshi  412 108 Pune Maharashtra", 
  "", "231 Lagrange Street  02132 Boston Massachusetts", "401 Chestnut St Suite 410 37402 Chattanooga Tennessee", 
  "st. ha Rav Bar Shaul 6  7625149 Rehovot HaMerkaz", "Paris Ile-de-France", 
  "7721 New Market Street  98501 Olympia Washington", "Bernrieder Str. 15  94559 Niederwinkling Bayern", 
  "Dover Delaware", "UNIT 1801, 18/F WAGA COMMERCIAL CENTER 99 WELLINGTON ST, CENTRAL,  Hong Kong Hong Kong Island", 
  "2810 Sydney Road  33566-1173 Plant City Florida", "1350 Avenue of the Americas 9th Floor 10019 New York New York", 
  ""), administrative_area_level_1 = c("Arizona", "District of Columbia", 
  NA, "New York", NA, "Connecticut", NA, NA, NA, "Massachusetts", 
  "Tennessee", "Center District", "?e-de-France", "Washington", 
  "Bayern", "Delaware", NA, NA, NA, NA), administrative_area_level_2 = c("Maricopa County", 
  NA, NA, "Albany County", NA, "Fairfield County", NA, NA, NA, 
  "Suffolk County", "Hamilton County", "Rehovot", "Paris", "Thurston County", 
  "Niederbayern", "Kent County", NA, NA, NA, NA), country = c("United States", 
  "United States", NA, "United States", NA, "United States", NA, 
  NA, NA, "United States", "United States", "Israel", "France", 
  "United States", "Germany", "United States", NA, NA, NA, NA), 
      locality = c("Phoenix", "Washington", NA, "Albany", NA, "Stamford", 
      NA, NA, NA, "Boston", "Chattanooga", "Rehovot", "Paris", 
      "Tumwater", "Niederwinkling", "Dover", NA, NA, NA, NA), neighborhood = c("Camelback East Village", 
      "Northwest Washington", NA, "Downtown", NA, "Downtown", NA, 
      NA, NA, "West Roxbury", NA, NA, NA, NA, NA, NA, NA, NA, NA, 
      NA), postal_code = c("85016", "20230", NA, "12207", NA, "06901", 
      NA, NA, NA, "02132", "37402", NA, NA, "98501", "94559", NA, 
      NA, NA, NA, NA), route = c("East Camelback Road", "Constitution Avenue Northwest", 
      NA, "State Street", NA, "Washington Boulevard", NA, NA, NA, 
      "Lagrange Street", "Chestnut Street", "HaRav Bar Shaul Street", 
      NA, "New Market Street Southwest", "Bernrieder Stra?", NA, 
      NA, NA, NA, NA), street_number = c("2355", "1401", NA, "80", 
      NA, "1055", NA, NA, NA, "231", "401", "6", NA, "7721", "15", 
      NA, NA, NA, NA, NA), subpremise = c("300", NA, NA, NA, NA, 
      NA, NA, NA, NA, NA, "410", NA, NA, NA, NA, NA, NA, NA, NA, 
      NA)), .Names = c("org_order", "organizations.api_path", "type", 
  "uuid", "name", "street_1", "street_2", "postal_code_cb", "city", 
  "city_web_path", "region", "region_code2", "region_web_path", 
  "country_cb", "country_code2", "country_code3", "country_web_path", 
  "latitude", "longitude", "created_at", "updated_at", "address", 
  "administrative_area_level_1", "administrative_area_level_2", 
  "country", "locality", "neighborhood", "postal_code", "route", 
  "street_number", "subpremise"), class = c("data.table", "data.frame"
  ), row.names = c(NA, -20L), .internal.selfref = &lt;pointer: 0x00000000001e0788&gt;)
  
  structure(list(address = structure(1:18, .Label = c("2355 E. Camelback Road Suite 300 85016 Phoenix Arizona", 
      "1401 Constitution Ave NW  20230 Washington District of Columbia", 
      "80 State Street 7th Floor  12207 Albany New York", "Spray Gaarde 46  3436 Nieuwegein Utrecht", 
      "1055 Washington Blvd., 7th Floor  6901 Stamford Connecticut", 
      "Village Khubavali, PO Paud Taluka Mulshi  412 108 Pune Maharashtra", 
      "231 Lagrange Street  2132 Boston Massachusetts", "401 Chestnut St Suite 410 37402 Chattanooga Tennessee", 
      "st. ha Rav Bar Shaul 6  7625149 Rehovot HaMerkaz", "Paris Ile-de-France", 
      "7721 New Market Street  98501 Olympia Washington", "Bernrieder Str. 15  94559 Niederwinkling Bayern", 
      "Dover Delaware", "UNIT 1801, 18/F WAGA COMMERCIAL CENTER 99 WELLINGTON ST, CENTRAL,  Hong Kong Hong Kong Island", 
      "2810 Sydney Road  33566-1173 Plant City Florida", "1350 Avenue of the Americas 9th Floor 10019 New York New York", 
      "Askanischer Platz 3  10963 Berlin Berlin", "Level 2, 145 Flinders Lane  03000 Melbourne Victoria"
      ), class = "factor"), administrative_area_level_1 = c("Arizona", 
      "District of Columbia", "New York", NA, "Connecticut", NA, "Massachusetts", 
      "Tennessee", "Center District", "?e-de-France", "Washington", 
      "Bayern", "Delaware", "Hong Kong Island", "Florida", "New York", 
      "Berlin", "Victoria"), administrative_area_level_2 = c("Maricopa County", 
      NA, "Albany County", NA, "Fairfield County", NA, "Suffolk County", 
      "Hamilton County", "Rehovot", "Paris", "Thurston County", "Niederbayern", 
      "Kent County", NA, "Hillsborough County", "New York County", 
      NA, "Melbourne City"), country = c("United States", "United States", 
      "United States", NA, "United States", NA, "United States", "United States", 
      "Israel", "France", "United States", "Germany", "United States", 
      "Hong Kong", "United States", "United States", "Germany", "Australia"
      ), locality = c("Phoenix", "Washington", "Albany", NA, "Stamford", 
      NA, "Boston", "Chattanooga", "Rehovot", "Paris", "Tumwater", 
      "Niederwinkling", "Dover", NA, "Plant City", "New York", "Berlin", 
      "Melbourne"), neighborhood = c("Camelback East Village", "Northwest Washington", 
      "Downtown", NA, "Downtown", NA, "West Roxbury", NA, NA, NA, NA, 
      NA, NA, "Central", NA, NA, NA, NA), postal_code = c("85016", 
      "20230", "12207", NA, "06901", NA, "02132", "37402", NA, NA, 
      "98501", "94559", NA, NA, "33566", "10019", "10963", "3000"), 
          route = c("East Camelback Road", "Constitution Avenue Northwest", 
          "State Street", NA, "Washington Boulevard", NA, "Lagrange Street", 
          "Chestnut Street", "HaRav Bar Shaul Street", NA, "New Market Street Southwest", 
          "Bernrieder Stra?", NA, "Wellington Street", "Sydney Road", 
          "6th Avenue", "Askanischer Platz", "Flinders Lane"), street_number = c("2355", 
          "1401", "80", NA, "1055", NA, "231", "401", "6", NA, "7721", 
          "15", NA, "99", "2810", "1350", "3", "145"), subpremise = c("300", 
          NA, NA, NA, NA, NA, NA, "410", NA, NA, NA, NA, NA, "1801", 
          NA, NA, NA, "2"), postal_code_suffix = c(NA, NA, NA, NA, 
          NA, NA, "3450", NA, NA, NA, NA, NA, NA, NA, "1173", NA, NA, 
          NA), premise = c(NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 
          NA, NA, NA, "Waga Commercial Centre", NA, NA, NA, NA), political = c(NA, 
          NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, "Manhattan", 
          "Bezirk Friedrichshain-Kreuzberg", NA)), .Names = c("address", 
      "administrative_area_level_1", "administrative_area_level_2", 
      "country", "locality", "neighborhood", "postal_code", "route", 
      "street_number", "subpremise", "postal_code_suffix", "premise", 
      "political"), row.names = c(NA, -18L), class = c("data.table", 
      "data.frame"), .internal.selfref = &lt;pointer: 0x00000000001e0788&gt;)
  </code></pre>