Anders Edenbrandt

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In solving large sparse linear least squares problems <italic>A</italic> x &sime; b, several different numeric methods involve computing the same upper triangular factor <italic>R</italic> of <italic>A</italic>. It is of interest to be able to compute the nonzero structure of <italic>R</italic>, given only the structure of <italic>A</italic>. The solution(More)
Electrocardiograms (ECG) recorded during arrhythmia surgery are used for identification of arrhythmias of different morphology. However, the interpretation of an intraoperative ECG is difficult because some leads cannot be recorded and the signals of the remaining leads often differ from those of a preoperative recording because of the sternotomy.(More)
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