該樓層疑似違規已被系統折疊 隐藏此樓檢視此樓
得到X,Y的資料點後，我嘗試用origin7.5的analysis-fit sigmoidal功能拟合出曲線，由于方程太複雜，用公式計算很困難，我想用origin直接對這條曲線求出曲率最大的點，望高人指點。
如果能用MATLAB得出的更好，望高手幫忙！急啊！(一共四組資料，X軸一樣的)
X軸：1E-4 2E-4 4E-4 6E-4 8E-4 1E-3 0.002 0.004 0.006 0.008 0.01 0.02 0.04 0.06 0.08 0.1 0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 14 16 18 20 30 40 50 60 70 80 90 100 200
Y軸第一組：210.24334 127.42569 99.2029 91.25993 87.53022 85.36597 81.19668 79.18902 78.5309 78.20389 78.00834 77.6187 77.42461 77.36003 77.32775 77.30839 77.26969 77.25035 77.2439 77.24068 77.23875 77.23488 77.23295 77.2323 77.23198 77.23179 77.23166 77.23156 77.2315 77.23144 77.2314 77.23127 77.23121 77.23117 77.23114 77.23112 77.23111 77.2311 77.23109 77.23105
Y軸第二組：338.76878 185.19147 136.92407 123.81295 117.73598 114.23392 107.53921 104.34045 103.29549 102.77693 102.46705 101.85009 101.54301 101.44085 101.38981 101.3592 101.298 101.26742 101.25723 101.25213 101.24907 101.24296 101.2399 101.23888 101.23837 101.23807 101.23786 101.23772 101.23761 101.23752 101.23746 101.23725 101.23715 101.23709 101.23705 101.23702 101.237 101.23698 101.23697 101.23691
Y軸第三組：938.12783 357.10946 220.32868 187.56894 173.06365 164.90462 149.7224 142.66378 140.38565 139.26026 138.58937 137.25725 136.59601 136.3763 136.26658 136.20079 136.0693 136.00361 135.98172 135.97077 135.96421 135.95108 135.94451 135.94232 135.94123 135.94057 135.94013 135.93982 135.93959 135.9394 135.93926 135.93882 135.9386 135.93847 135.93838 135.93832 135.93827 135.93824 135.93821 135.93808
Y軸第四組：2335.14843 643.49664 337.80197 272.50061 244.74855 229.47307 201.72276 189.13264 185.11304 183.13539 181.95896 179.62871 178.47481 178.09182 177.90063 177.78602 177.55702 177.44263 177.40451 177.38546 177.37403 177.35117 177.33974 177.33593 177.33402 177.33288 177.33212 177.33158 177.33117 177.33085 177.3306 177.32983 177.32945 177.32922 177.32907 177.32896 177.32888 177.32882 177.32877 177.32854