数据曲线的包络提取（matlab）

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7.1605474e-001 2.6200000e+000 7.4315337e-001 2.6400000e+000 7.0378376e-001 2.6600000e+000 6.0139570e-001 2.6800000e+000 4.4510785e-001 2.7000000e+000 2.4889157e-001 2.7200000e+000 3.0316083e-002 2.7400000e+000 -1.9103199e-001 2.7600000e+000 -3.9531183e-001 2.7800000e+000 -5.6421492e-001 2.8000000e+000 -6.8261323e-001 2.8200000e+000 -7.3992018e-001 2.8400000e+000 -7.3104131e-001 2.8600000e+000 -6.5682901e-001 2.8800000e+000 -5.2400053e-001 2.9000000e+000 -3.4452725e-001 2.9200000e+000 -1.3455092e-001 2.9400000e+000 8.7074545e-002 2.9600000e+000 3.0048335e-001 2.9800000e+000 4.8658631e-001 3.0000000e+000 6.2878576e-001 3.0200000e+000 7.1446213e-001 3.0400000e+000 7.3609860e-001 3.0600000e+000 6.9194309e-001 3.0800000e+000 5.8614917e-001 3.1000000e+000 4.2838455e-001 3.1200000e+000 2.3294431e-001 3.1400000e+000 1.7450291e-002 3.1600000e+000 -1.9874431e-001 3.1800000e+000 -3.9630027e-001 3.2000000e+000 -5.5762951e-001 3.2200000e+000 -6.6846741e-001 3.2400000e+000 -7.1913913e-001 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4.5600000e+000 -3.1535877e-001 4.5800000e+000 -1.9188868e-001 4.6000000e+000 -5.4035124e-002 4.6200000e+000 8.5626072e-002 4.6400000e+000 2.1462690e-001 4.6600000e+000 3.2172315e-001 4.6800000e+000 3.9787640e-001 4.7000000e+000 4.3701625e-001 4.7200000e+000 4.3651843e-001 4.7400000e+000 3.9736174e-001 4.7600000e+000 3.2395686e-001 4.7800000e+000 2.2366967e-001 4.8000000e+000 1.0608938e-001 4.8200000e+000 -1.7886509e-002 4.8400000e+00