I'm trying to determine parameters for photosynthesis-irradiance curves using a custom fit based on a previously published equation. The equation makes perfect sense, but I'm coming up against some "function parsing error" when trying to parametize the regression model. Any ideas would be greatly appreciated!
Two ideas: 1.) depending on the number of parameters in your model I could imagine that the program might have problems to converge to estimate parameters from such as small data-set 2.) is your data-format correctly defined (= Does Sigmaplot treat your data as continous/numeric)? Did you google the error message? (I quickly did, but unfortunately only found this japanese page http://tinyurl.com/kcdjwas)
I had almost the same problem and came across "function parsing error" when performing curve fitting. Finally, I understood that the problem was due to my windows settings. I just changed my numbering format from Persian into English (US) and changed my decimal sumbol from / into . and the problem was solved, Visit this link (https://www.hep.wisc.edu/~prepost/SPW7/faq.txt) for more info.
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