Question

我想通过将采样频率减半来进行下采样。我的信号由IObservable<Sample>表示。因此，我必须跳过流中的每个第二个样本。我试过这样的。但是在Buffer（2）之后第二个select命令出错。

IntelliSense消息（在select命令上）是：“无法根据用法推断出方法[... SkipEverySecond ...]的类型参数。请尝试明确指定类型参数。”通过删除赋值“samples =＆gt;”可以消除此错误。我不明白为什么......

/// <summary>
/// Called when a part's imports have been satisfied and it is safe to use
/// </summary>
public void OnImportsSatisfied()
{
    signalFiltering.ConfigureFilters(filterParameter);
    configManager.LoadAttributed(this, this);

    //currentRdm.ForwardedDataSource is an imported Observable
    //ToDo: Skip every second sample (downsampling)
    this._forwardedDataSource = this.currentRdm.ForwardedDataSource.Select(
           sample => signalFiltering.Filter(sample, filterParameter)).
                                     Buffer(2).Select(samples => SkipEverySecond);

    this._qrsComplexis = this._forwardedDataSource.Buffer(QRSWINDOWSIZE).Select(SamplePacketProcess);
}

private Sample SkipEverySecond(IEnumerable<Sample> samples )
{
    return samples.First();
}

Answer 1

您不需要lambda表达式samples =>。 Select正在应用于Buffer的输出，如果我理解正确的话，IEnumerable<Sample>

跳过Observable中的每个第二个元素

1 个答案: