Hi @ycho-3, you need to do element by element multiplication for your equations to work. Also, you need to have a simple function for your e-e-t data (see the attached).
As already pointed out, you need to vectorize the expressions.
When using minerr, do not calculate the error. Calculate a vector of residuals, resid:=fitting-experiment, and pass that to minerr. You will get better results.
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