楼: Originally posted by change0618 at 2012-01-15 18:20:12:
怎么可能不行呢？
下图怎么样？

楼: Originally posted by 晓风淡月 at 2012-01-15 20:08:45:
方法一：Analysis-Fitting-nonlinerfit:点ｆ（ｘ）在方程中选上Logarithm-Log3p1:y = a - b*ln(x+c)
方法二：在f(x)中New function自定义方程：y=a + b*lnx(a b为参量)

7楼: Originally posted by dingd at 2012-01-15 17:43:35:
为什么不用1stOpt，拟合优化比Origin强大的多也好用的多。另外非线性问题线性化后拟合有时会有较大误差的，不推荐。