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POHow to detect sequential event change properly in R data frame
 

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    <p>I'm a beginer with R. I discover and all theses wonderfull feature to analyse data. I want to filter a data frame by detecting event change. For example, if we took the following data :</p> <pre><code>testcase date event 1 TESTCASE1 2013-06-12 18:12:09 EVENT1 2 TESTCASE1 2013-06-12 18:12:12 EVENT1 3 TESTCASE1 2013-06-12 18:12:15 EVENT2 4 TESTCASE1 2013-06-12 18:12:16 EVENT2 5 TESTCASE1 2013-06-12 18:12:25 EVENT1 6 TESTCASE2 2013-06-12 18:12:10 EVENT4 7 TESTCASE2 2013-06-12 18:12:16 EVENT4 8 TESTCASE2 2013-06-12 18:12:17 EVENT2 9 TESTCASE2 2013-06-12 18:12:26 EVENT2 10 TESTCASE2 2013-06-12 18:12:30 EVENT1 </code></pre> <p>I'd like to return only the line where there are an event changed. For this example, it give this : </p> <pre><code> testcase date event 2 TESTCASE1 2013-06-12 18:12:12 EVENT1 3 TESTCASE1 2013-06-12 18:12:15 EVENT2 4 TESTCASE1 2013-06-12 18:12:16 EVENT2 5 TESTCASE1 2013-06-12 18:12:25 EVENT1 7 TESTCASE2 2013-06-12 18:12:16 EVENT4 8 TESTCASE2 2013-06-12 18:12:17 EVENT2 9 TESTCASE2 2013-06-12 18:12:26 EVENT2 10 TESTCASE2 2013-06-12 18:12:30 EVENT1 </code></pre> <p>The only way I have found to do this, is to use loop. It give the following code :</p> <pre><code>result &lt;- data.frame( testcase = c("TESTCASE1","TESTCASE1","TESTCASE1","TESTCASE1","TESTCASE1","TESTCASE2","TESTCASE2","TESTCASE2","TESTCASE2","TESTCASE2"), date = c("2013-06-12 18:12:09","2013-06-12 18:12:12","2013-06-12 18:12:15","2013-06-12 18:12:16","2013-06-12 18:12:25","2013-06-12 18:12:10","2013-06-12 18:12:16","2013-06-12 18:12:17","2013-06-12 18:12:26","2013-06-12 18:12:30"), event = c("EVENT1","EVENT1","EVENT2","EVENT2","EVENT1","EVENT4","EVENT4","EVENT2","EVENT2", "EVENT1")) tc &lt;- result[1,"testcase"] currentDate &lt;- result[1,"date"] currentEvent &lt;- result[1,"event"] #index variable de sortieoutput j &lt;- 1 output &lt;- c() for(i in 2:length(result[,1])){ if(tc != result[i,"testcase"]){ tc &lt;- result[i,"testcase"]; currentEvent &lt;- result[i,"event"] }else{ #detection de handhover if(result[i,"event"] != currentEvent){ output[j] &lt;- i-1 output[j+1] &lt;- i j &lt;- j+2 currentEvent &lt;- result[i,"event"] } } } output_data &lt;- result[unique(output),] </code></pre> <p>But in R, loop are not recommended and (very) slow, also my data set is very big. Have you got an idea to use a more R compliant solution ?</p>
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