python curve_fit "Optimal parameters not found"

[Matthew]

Hello, i have a macro that uses a python script (the Curve_Fit function) to fit a curve onto a dataset. i found a math function that describes my data very well ((a/(x+b))+c), but something weird is happening

When i try to run the same function on a subset of the data ([GroupBy = 'SFB'), the function either fails completely, or it gives me a curve that isnt fitted to the data at all.

This is the error: "RuntimeError: Optimal parameters not found: Number of calls to function has reached maxfev = 800."

But this makes no sense because all of the data follows the same basic shape, so the optimal parameters for any subset should be similar to the ones it finds for the whole data set

Is anyone familiar with the Python Curve_Fit code?

[Matthew · Accepted solution]

Ah, never mind... the reason is because i don't have enough data points for all groups..