Created
May 2, 2013 06:12
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Honours Project Data Analysis in R
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| library(rrdf) | |
| g <- load.rdf("sparql.rdf") | |
| rs <- sparql.rdf(g, "PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> | |
| PREFIX qudt: <http://qudt.org/1.1/schema/qudt#> | |
| PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> | |
| PREFIX ssn: <http://purl.oclc.org/NET/ssnx/ssn#> | |
| PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> | |
| SELECT ?temperature ?time WHERE { | |
| ?sensor rdf:type <http://uktemp.net/ont/#WundergroundTemperatureSensingDevice> . | |
| ?observation ssn:observedProperty <http://uktemp.net/dataset/temperature/AB24> . | |
| ?observation ssn:hasValue ?value . | |
| ?observation ssn:observationSamplingTime ?time . | |
| ?value qudt:numericValue ?temperature . | |
| FILTER ( ?time < \"2013-04-25T00:00:00.00Z\"^^xsd:dateTime ) | |
| FILTER ( ?temperature < \"20.0\"^^xsd:double ) | |
| }") | |
| temps <- as.numeric(rs[,1]) | |
| times <- strptime(sub("\\..*$", "", rs[,2]), "%FT%T", "GMT") | |
| jpeg("html/plot.jpg") | |
| plot(times, temps) | |
| dev.off() |
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