mathematica非线性拟合问题date={{1990, 632.98}, {1991, 702.15}, {1992, 809.94}, {1993, 973.35}, {1994, 1147.37}, {1995, 1289.96}, {1996, 1389.75}, {1997, 1577.45}, {1998, 1742.95}, {1999, 1986.82}, {2000, 2234.24}, {2001, 2572.82}, {200

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mathematica非线性拟合问题date={{1990, 632.98}, {1991, 702.15}, {1992, 809.94}, {1993, 973.35}, {1994, 1147.37}, {1995, 1289.96}, {1996, 1389.75}, {1997, 1577.45}, {1998, 1742.95}, {1999, 1986.82}, {2000, 2234.24}, {2001, 2572.82}, {200

mathematica非线性拟合问题date={{1990, 632.98}, {1991, 702.15}, {1992, 809.94}, {1993, 973.35}, {1994, 1147.37}, {1995, 1289.96}, {1996, 1389.75}, {1997, 1577.45}, {1998, 1742.95}, {1999, 1986.82}, {2000, 2234.24}, {2001, 2572.82}, {200
mathematica非线性拟合问题
date={{1990, 632.98}, {1991, 702.15}, {1992, 809.94}, {1993, 973.35}, {1994,
1147.37}, {1995, 1289.96}, {1996, 1389.75}, {1997, 1577.45}, {1998,
1742.95}, {1999, 1986.82}, {2000, 2234.24}, {2001, 2572.82}, {2002,
3022.15}, {2003, 3602.15}, {2004, 4175.37}, {2005, 5007.73}, {2006,
6030.67}, {2007, 7234.57}, {2008, 8601.}, {2009, 10855.5}, {2010,
13740.5}}
n1/(1+(n1/632.98-1)Exp[-r(t-1990)],其中n1,r是参数 t是自变量
求解答,马上就结束了,求帮助. 求解,急啊.先谢谢了

mathematica非线性拟合问题date={{1990, 632.98}, {1991, 702.15}, {1992, 809.94}, {1993, 973.35}, {1994, 1147.37}, {1995, 1289.96}, {1996, 1389.75}, {1997, 1577.45}, {1998, 1742.95}, {1999, 1986.82}, {2000, 2234.24}, {2001, 2572.82}, {200
data = {{1990,632.98},{1991,702.15},{1992,809.94},{1993,
973.35},{1994,1147.37},{1995,1289.96},{1996,1389.75},{1997,
1577.45},{1998,1742.95},{1999,1986.82},{2000,
2234.24},{2001,2572.82},{2002,3022.15},{2003,
3602.15},{2004,4175.37},{2005,5007.73},{2006,
6030.67},{2007,7234.57},{2008,8601.},{2009,10855.5},{2010,
13740.5}};
FindFit[data,n1/(1 + (n1/632.98 - 1) Exp[-r (t - 1990)]),{n1,r},t]

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