Levenberg Marquardt fit : formula problem

[nitad54448]

Hi

I am soo.. new to LM fit I might have a stupid question... So please bear with me !

I am trying to fit a simple formula but LV routine tells me my formula in wrong.

attached is  a png image for my case !

Thanks for any help

regards

N

[johnsold · Accepted solution]

Without looking at the help, I am not sure but check to see if the formula is case sensitive.

Lynn