2021-08-09 13:38:11 +02:00
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library(DBI)
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library(tidyr)
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2021-08-09 18:10:31 +02:00
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con <- dbConnect(RPostgres::Postgres(),
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dbname='mainscnt',
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host='172.16.10.27',
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user='wn')
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START <- "2021-08-02T14:00:00.0Z"
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END <- "2021-08-02T15:00:00.0Z"
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res <-dbSendQuery(con, "select time, location, freq from mainsfrequency where valid=1 and time >= $1 and time < $2")
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dbBind(res, list(START, END))
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frequencies <- dbFetch(res)
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2021-08-09 13:38:11 +02:00
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dbClearResult(res)
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2021-08-09 18:10:31 +02:00
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freq_wide <- frequencies %>%
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pivot_wider(names_from = location,
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values_from = freq,
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values_fn = mean)
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THRESHOLD <- 0.5
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for (colIdx in 2:length(freq_wide)) {
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last <- freq_wide[[1, colIdx]]
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for (rowIdx in 1:length(freq_wide[[colIdx]])) {
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current <- freq_wide[[rowIdx, colIdx]]
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if (!is.na(current) && !is.na(last) && (abs(current - last) > THRESHOLD)) {
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freq_wide[[rowIdx, colIdx]] = NA
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}
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last <- current
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}
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}
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freq_wide <- freq_wide %>%
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rowwise() %>%
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mutate(mad = mad(c_across(names(freq_wide)[-1]),
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na.rm=TRUE))
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# print(summary(freq_wide))
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print(sum(freq_wide$mad) / length(freq_wide$mad))
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dbDisconnect(con)
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