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Seeking extrema

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  • Dezember 5, 2006 um 11:23 pm Uhr #12505
    Dirk KampffmeyerDirk Kampffmeyer
    Teilnehmer

    Hello,
    I would like to search an extrema and reduce the signal starting from this extrema. The program, however, outputs nothing but a failure of data structure.
    dim idxextrema=GlobalMaximum(Ch1,EVENT_INDEX)
    CH1[[idxextrema, Empty]]

    Dezember 5, 2006 um 11:23 pm Uhr #8168
    Dirk KampffmeyerDirk Kampffmeyer
    Teilnehmer

    Hello,
    I would like to search an extrema and reduce the signal starting from this extrema. The program, however, outputs nothing but a failure of data structure.
    dim idxextrema=GlobalMaximum(Ch1,EVENT_INDEX)
    CH1[[idxextrema, Empty]]

    Dezember 5, 2006 um 11:54 pm Uhr #8805
    Bernhard KantzBernhard Kantz
    Teilnehmer

    Why do you use the Value Index operator and Empty as second argument?
    The result of GlobalMaximum is a data series with the indices of the maxima. In your case you need a scalar start index and a scalar end index. Use the Index operator. -1 is the index of the last value. 

    
CH1[idxextrema[0], -1]

    The result is a signal starting from the first maximum.

    If you only need the maximum y-value use the Maximum-function.

    
Maximum(ch1) //is equivalent to CH1[idxextrema[0]]

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