added

freqdist.R

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+library(tidyverse)
+library(DBI)
+
+Sys.setenv(PGHOST = "db.mainscnt.eu",
+          PGDATABASE = "mainscnt",
+          PGPORT = 5432,
+          PGUSER = "wn",
+          PGSSLMODE = "verify-ca",
+          PGSSLKEY = "/home/wn/keys/psql/wn-postgresql-client-2.pem",
+          PGSSLCERT = "/home/wn/keys/psql/wn-postgresql-client-2.crt",
+          PGSSLROOTCERT = "/home/wn/keys/psql/postgres-ca.crt")
+
+
+con <- dbConnect(RPostgres::Postgres())
+res <-dbSendQuery(con, 
+                  'select time, freq, location
+                     from mainsfrequency 
+                     where time >= \'2022-04-01 00:00:00\' and 
+                           time < \'2022-04-05 00:00:00\' and 
+                           valid = 1')
+freqs <- dbFetch(res)
+dbClearResult(res)
+dbDisconnect(con)
+
+freqs <- as_tibble(freqs)
+freqs <- freqs %>% 
+  mutate(year = year(time), month = month(time), day = day(time)) %>% 
+  group_by(year, month, day)
+
+# p = ggplot(data = freqs) +
+#   geom_histogram(mapping = aes(x = freq))
+# print(p)
+
+#p <- ggplot(data=freqs) +
+#  geom_boxplot(mapping=aes(group=day,x=time,y=freq), na.rm=TRUE) +
+#  scale_x_datetime("Date", breaks="1 day") +
+#  scale_y_continuous("Frequency") +
+#  theme(axis.text.x=element_text(angle=-90, vjust=0)) +
+#  labs(title = "Mains Frequency deviation")
+
+p <- ggplot(data= freqs) +
+  geom_freqpoly(mapping = aes(x=freq, color=location))
+
+print(p)