Reply To: Randomization of presentation of columns in trial with last column always last

Hi,

You can reference the keys set1, set2, set3 and set4 in an array and shuffle it using Ibex’s fisherYates:

Template("speecherrors.csv", row =>
    newTrial("repetition",
        defaultText
            .css("p")
            .center()
            .print()
        ,
        newText("Please repeat the following sets of words as fast as you can when they appear on the screen. Press start to display them.")
            .css("p")
        ,
        newButton("Start")
            .log()
            .center()
            .print()
            .wait()
            .remove()
        ,
        newTimer("wait", 1000)
            .log()
            .start()
            .wait()
        ,
        newMediaRecorder("speech_set1", "audio")
            .log()
            .record()
        ,
        newText( "blank line" )
            .hidden()
        ,
        row.sets = ["set1","set2","set3","set4"],  // array of keys
        fisherYates(row.sets)                      // shuffle the array
        ,
        newText("set1", row[row.sets[0]])          // use the first (shuffled) key
            .log()
        ,
        newTimer("wait", 3000)
            .log()
            .callback(getMediaRecorder("speech_set1").stop())
            .start()
            .wait()
        ,
        getText("set1")
            .remove()
        ,
        newTimer("wait", 1000)
            .log()
            .start()
            .wait()
        ,
        newMediaRecorder("speech_set2", "audio")
            .log()
            .record()
        ,
        newText("set2", row[row.sets[1]])          // use the second (shuffled) key
            .log()
        ,
        newTimer("wait", 3000)
            .log()
            .callback(getMediaRecorder("speech_set2").stop())
            .start()
            .wait()
        ,
        getText("set2")
            .remove()
        ,
        newTimer("wait", 1000)
            .log()
            .start()
            .wait()
        ,
        newMediaRecorder("speech_set3", "audio")
            .log()
            .record()
        ,
        newText("set3", row[row.sets[2]])          // use the third (shuffled) key
            .log()
        ,
        newTimer("wait", 3000)
            .log()
            .callback(getMediaRecorder("speech_set3").stop())
            .start()
            .wait()
        ,
        getText("set3")
            .remove()
        ,
        newTimer("wait", 1000)
            .log()
            .start()
            .wait()
        ,
        newMediaRecorder("speech_set4", "audio")
            .log()
            .record()
        ,
        newText("set4", row[row.sets[3]])          // use the fourth (shuffled) key
            .log()
        ,
        newTimer("wait", 3000)
            .log()
            .callback(getMediaRecorder("speech_set4").stop())
            .start()
            .wait()
        ,
        getText("set4")
            .remove()
        ,
        newTimer("wait", 1000)
            .log()
            .start()
            .wait()
        ,
        newMediaRecorder("speech_target", "audio")
            .log()
            .record()
        ,
        newText("target", row.target)
            .log()
        ,
        newTimer("wait", 3000)
            .log()
            .callback(getMediaRecorder("speech_target").stop())
            .start()
            .wait()
        ,
        getText("target")
            .remove()
    )
    .log("first", row[row.sets[0]])   // log the first shuffled key
    .log("second", row[row.sets[1]])  // log the second shuffled key
    .log("third", row[row.sets[2]])   // log the third shuffled key
    .log("fourth", row[row.sets[3]])  // log the fourth shuffled key
    .log("target", row.target)        // log the target word too
)

Jeremy