请让我问一下有关nls.lm精加工条件的控制。
下面您可以看到nls.lm在尝试拟合我的数据时显示的日志。由于参数的目标值为{0，0.05，0.5，0}，如果我希望函数在迭代29、30或31停止时，您是否知道应该为ptol或ftol设置的值？
谢谢。
It. 23, RSS = 3.90984e-07, Par. = 0.000336657 0.0496077 0.499512 0.400874 It. 24, RSS = 2.75825e-08, Par. = 0.000167468 0.0497082 0.500001 0.200901 It. 25, RSS = 1.85953e-09, Par. = 8.30194e-05 0.0497505 0.500002 0.0996384 It. 26, RSS = 1.45254e-10, Par. = 3.99165e-05 0.0497721 0.500003 0.0479206 It. 27, RSS = 1.37006e-11, Par. = 1.68307e-05 0.0497836 0.500003 0.0202179 It. 28, RSS = 7.29574e-13, Par. = 4.00511e-06 0.04979 0.500002 0.00481911 It. 29, RSS = 1.54053e-15, Par. = 9.06664e-08 0.0497919 0.5 0.000110152 It. 30, RSS = 8.29473e-18, Par. = 1.48169e-08 0.0497919 0.5 1.77622e-05 It. 31, RSS = 6.28718e-18, Par. = 1.31978e-08 0.0497919 0.5 1.58192e-05 It. 32, RSS = 5.19729e-18, Par. = 1.20234e-08 0.049792 0.5 1.44384e-05 It. 33, RSS = 4.26672e-18, Par. = 1.0823e-08 0.049792 0.5 1.29703e-05