How do I apply a hill-curve or s-curve to this plot?

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AgonW
AgonW 2020-4-4
评论： AgonW 2020-4-4
I want to plot a curve to this plot, it contains nan values an 0 values, i have tried 'poly3' fit but I am still not happy with the result. The output should level at 13500 max and start at 0. I do not know how to find the coefficients for more complicated plots.
I know of lsqcurve() but i do not know how to calculate the bo term
  2 个评论
AgonW
AgonW 2020-4-4
for using lsqcurvefit() i get the following error
lsqcurvefit stopped because it exceeded the function evaluation limit,
options.MaxFunctionEvaluations = 2.000000e+02.
is there any way to overcome this?

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