📈 More stations

README.md

@@ -8,22 +8,22 @@ Each row is one measurement in the format `<string: station id>;<double: measure
 The following shows ten rows as an example:
 
 ```
-hamburg;11.0
-hammerfest;-12.7
-auckland;5.3
-lima;6.6
-concordia;-42.5
-hammerfest;-6.7
-hamburg;9.0
-hammerfest;-11.9
-hamburg;-0.7
-concordia;-48.5
+Hamburg;12.0
+Bulawayo;8.9
+Palembang;38.8
+St. John's;15.2
+Cracow;12.6
+Bridgetown;26.9
+Istanbul;6.2
+Roseau;34.4
+Conakry;31.2
+Istanbul;23.0
 ```
 
 The task is to write a Java program which reads the file, calculates the average temperature value per weather station, and emits the result on stdout like this:
 
 ```
-{auckland=5.3, concordia=-45.5, hamburg=6.4, hammerfest=-10.4, lima=6.6}
+{Abha=18.0, Abidjan=26.0, Abéché=29.4, Accra=26.4, Addis Ababa=16.0, Adelaide=17.3, ...}
 ```
 
 Submit your implementation by Jan 31 2024 and become part of the leaderboard!

evaluate.sh

@@ -0,0 +1,22 @@
+#!/bin/sh
+#
+#  Copyright 2023 The original authors
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+
+
+for i in {1..5}
+do
+    time ./calculate_average.sh
+done

src/main/java/dev/morling/onebrc/CreateMeasurements.java

@@ -52,6 +52,28 @@ public static void main(String[] args) throws Exception {
             System.exit(1);
         }
 
+        // data from https://en.wikipedia.org/wiki/List_of_cities_by_average_temperature;
+        // converted using https://wikitable2csv.ggor.de/
+        // brought to form using DuckDB:
+        // D copy (
+        //     select City, regexp_extract(Year,'(.*)\n.*', 1) as AverageTemp
+        //     from (
+        //         select City,Year
+        //         from read_csv_auto('List_of_cities_by_average_temperature_1.csv', header = true)
+        //         union
+        //         select City,Year
+        //         from read_csv_auto('List_of_cities_by_average_temperature_2.csv', header = true)
+        //         union
+        //         select City,Year
+        //         from read_csv_auto('List_of_cities_by_average_temperature_3.csv', header = true)
+        //         union
+        //         select City,Year
+        //         from read_csv_auto('List_of_cities_by_average_temperature_4.csv', header = true)
+        //         union
+        //         select City,Year
+        //         from read_csv_auto('List_of_cities_by_average_temperature_5.csv', header = true)
+        //         )
+        // ) TO 'output.csv' (HEADER, DELIMITER ',');
         List<WeatherStation> stations = Arrays.asList(
                 new WeatherStation("Adelaide", 17.3),
                 new WeatherStation("Melbourne", 15.1),