/// <summary>
/// Analyze the specified input and parameters.
/// </summary>
/// <returns>The analyze.</returns>
/// <param name="input">Input.</param>
/// <param name="parameters">Parameters.</param>
public IEnumerable <ICsvWritable> Analyze(IEnumerable <SensorReading> input,
IEnumerable <Parameter> parameters)
{
// first, split records according to distinct labels containing the word "select"
var inputGroups = input.Where(x => x.Label.Contains("select")).GroupBy(x => x.Label);
if (inputGroups == null || !inputGroups.Any())
{
return(new List <SelectResult>());
}
// next, parse out the parameters we need
var pauseCommand = parameters.Where(x =>
x.Field.Equals(CommandParameters.InstantaneousSpeed)).FirstOrDefault();
var pauseThreshold = decimal.Parse(pauseCommand.Clauses.Where(x =>
x.Key.Equals(CommandParameters.Threshold)).FirstOrDefault().Value);
var pauseWindow = int.Parse(pauseCommand.Clauses.Where(x =>
x.Key.Equals(CommandParameters.Window)).FirstOrDefault().Value);
var varianceCommand = parameters.Where(x =>
x.Field.Equals(CommandParameters.Acceleration)).FirstOrDefault();
var varianceThreshold = varianceCommand.Clauses.Where(x =>
x.Key.Equals(CommandParameters.Variance)).FirstOrDefault().Value;
// next, for each group with a distinct label, calculate:
// total task time
// num of first record (when task starts)
// num of first record when user starts moving
// count of significant pauses
// accel-x std. dev.
// accel-y std. dev.
// accel-z std. dev.
var results = new List <SelectResult>();
foreach (var inputGroup in inputGroups)
{
// generating a result
var result = new SelectResult
{
Label = inputGroup.First().Label,
Duration = ((inputGroup.Last().RecordNum -
inputGroup.First().RecordNum) *
Constants.BAT.SAMPLING_PERIOD_IN_MS) / 1000.0M,
TaskStartRecordNum = inputGroup.First().RecordNum,
Pauses = PauseDurationAnalysis.EvaluatePause(inputGroup,
CommandParameters.InstantaneousSpeed,
pauseThreshold, pauseWindow),
AccelXStdDev = MathService.StandardDeviation(inputGroup.Select(x => x.AccelX)),
AccelYStdDev = MathService.StandardDeviation(inputGroup.Select(x => x.AccelY)),
AccelZStdDev = MathService.StandardDeviation(inputGroup.Select(x => x.AccelZ)),
StdDevThreshold = decimal.Parse(varianceThreshold)
};
results.Add(result);
}
// finally, return the results (one record per input group)
return(results);
}
/// <summary>
/// Analyze the specified input and parameters.
/// </summary>
/// <returns>The analyze.</returns>
/// <param name="input">Input.</param>
/// <param name="parameters">Parameters.</param>
public IEnumerable <ICsvWritable> Analyze(IEnumerable <SensorReading> input,
IEnumerable <Parameter> parameters)
{
// first, split records according to distinct labels containing the word "select"
var inputGroups = input.Where(x => x.Label.Contains("select")).GroupBy(x => x.Label);
if (inputGroups == null || !inputGroups.Any())
{
return(new List <SelectResult>());
}
// next, parse out the parameters we need
var pauseCommand = parameters.Where(x =>
x.Field.Equals(CommandParameters.InstantaneousSpeed)).FirstOrDefault();
var pauseThreshold = decimal.Parse(pauseCommand.Clauses.Where(x =>
x.Key.Equals(CommandParameters.Threshold)).FirstOrDefault().Value);
var pauseWindow = int.Parse(pauseCommand.Clauses.Where(x =>
x.Key.Equals(CommandParameters.Window)).FirstOrDefault().Value);
var varianceCommand = parameters.Where(x =>
x.Field.Equals(CommandParameters.Acceleration)).FirstOrDefault();
var varianceThreshold = varianceCommand.Clauses.Where(x =>
x.Key.Equals(CommandParameters.Variance)).FirstOrDefault().Value;
var results = new List <SelectResult>();
foreach (var inputGroup in inputGroups)
{
// converting accel to velocity
List <decimal>[] velocities =
{
MathService.SimpsonsRuleIntegral(inputGroup.Select(x => x.AccelX).ToList()),
MathService.SimpsonsRuleIntegral(inputGroup.Select(x => x.AccelY).ToList()),
MathService.SimpsonsRuleIntegral(inputGroup.Select(x => x.AccelZ).ToList())
};
// converting velocity to position
List <decimal>[] positions =
{
MathService.SimpsonsRuleIntegral(velocities[X_INDEX]),
MathService.SimpsonsRuleIntegral(velocities[Y_INDEX]),
MathService.SimpsonsRuleIntegral(velocities[Z_INDEX])
};
// generating a result
var result = new SelectResult
{
Label = inputGroup.First().Label,
Duration = ((inputGroup.Last().RecordNum -
inputGroup.First().RecordNum) *
Constants.BAT.SAMPLING_PERIOD_IN_SEC),
TaskStartRecordNum = inputGroup.First().RecordNum,
Pauses = PauseDurationAnalysis.EvaluatePause(inputGroup,
CommandParameters.InstantaneousSpeed,
pauseThreshold, pauseWindow),
AccelXStdDev = positions[X_INDEX].Last(),
AccelYStdDev = positions[Y_INDEX].Last(),
AccelZStdDev = positions[Z_INDEX].Last(),
StdDevThreshold = decimal.Parse(varianceThreshold)
};
results.Add(result);
}
// finally, return the results (one record per input group)
return(results);
}
