static double DrsCalibrate::FindStep ( const size_t  ch0, const float *  vec, int16_t  roi, const int16_t  pos, const uint16_t *  map = NULL  )

inlinestatic

Definition at line 424 of file DrsCalib.h.

Referenced by CorrectStep().

    {
        // We have about 1% of all cases which are not ahndled here,
        // because the baseline jumps up just before the readout window
        // and down just after it. In this cases we could determine the jump
        // from the board time difference or throw the event away.
        if (pos==0 || pos>=roi)
            return 0;

        double step = 0; // before
        double rms  = 0; // before
        int    cnt  = 0;

        // Exclude TM channel
        for (int p=0; p<8; p++)
        {
            const size_t hw = ch0+p;
            const size_t sw = (map?map[hw]:hw)*roi + pos;

            const double diff = vec[sw]-vec[sw-1];

            step += diff;
            rms  += (vec[sw]-vec[sw-1])*(vec[sw]-vec[sw-1]);

            cnt++;
        }

        return cnt==0 ? 0 : step/cnt;
    }

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