I've already used this C open source library, very easy to interface with Delphi (after compilation with BC++ compiler).
This code is based on standard lmfit well-known implementation of the algorithm, and perfectly resolve 4PL or 5PL equations. I've used this library in high-value biological software, including full validation using NIST reference material. I can not include the Delphi code here (this is copyrighted) but the C source code is ready to be downloaded above, and easy to work with (just one .obj file to include - or make a pure Delphi conversion).
You have several paid libraries around, but I did not find anything better, faster, or more accurate than lmfit.
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您可以使用非线性曲线拟合库，例如使用 Levenberg-Marquardt 算法。
我已经使用过这个C开源库，非常容易与Delphi交互（使用编译后） BC++ 编译器）。
该代码基于 标准 lmfit 众所周知的算法实现，并且完美求解 4PL 或 5PL 方程。我已在高价值生物软件中使用此库，包括使用 NIST 参考资料进行全面验证。我不能在这里包含 Delphi 代码（这是受版权保护的），但 C 源代码已准备好在上面下载，并且易于使用（只需包含一个
.obj文件 - 或制作一个纯德尔菲转换）。您周围有几个付费库，但我没有找到比 lmfit 更好、更快或更准确的库。
You can use non-linear curve fitting library, e.g. using Levenberg-Marquardt algorithm.
I've already used this C open source library, very easy to interface with Delphi (after compilation with BC++ compiler).
This code is based on standard lmfit well-known implementation of the algorithm, and perfectly resolve 4PL or 5PL equations. I've used this library in high-value biological software, including full validation using NIST reference material. I can not include the Delphi code here (this is copyrighted) but the C source code is ready to be downloaded above, and easy to work with (just one
.objfile to include - or make a pure Delphi conversion).You have several paid libraries around, but I did not find anything better, faster, or more accurate than lmfit.