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Function for an Exponential fit for MATLAB without curve fitting toolbox

I had to create a exponential fit I did not have the `proper package' This is pretty niche and worked for my specific problem

#This function takes two vectors, x and y then does a polyfit if the polyfit comes back with an R^2 of > 0.9 then it spits out an error if polytfit comes back < 0.9, then it does another polyfit, now using log10(y) the resulting equation is then solved and turned into an exponential

the function plots your input x and y, along with the exponential fit line and equation