I have fitted my data with a gaussion function. the curve is basically lying in first coordinate and not starting from zero. I want to calculate the value of x for y=0 (x would then definitely come in 2nd coordinate). How to find this value of x. In figure, the first fitted curve (not starting from zero)

`fun1 = @(p,xdata) p(1).*(1-exp(-xdata./p(2)))+5000;`

I want to a value of x for y=0 (when curve touches x axis). How to find it. Any lead will be appricated.

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