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error during fitting a model

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aditi
aditi 2018-1-19
评论： Torsten 2018-1-19
I am fitting a function using "fittype" and "fit" commands. But I am getting following error again and again. Sometimes it goes away. But rarely. Please help me.
Error using fit>iFit (line 340) Complex value computed by model function, fitting cannot continue. Try using or tightening upper and lower bounds on coefficients.
Error in fit (line 108) [fitobj, goodness, output, convmsg] = iFit( xdatain, ydatain, fittypeobj, ...
Error in test2 (line 10) f=fit(x,y,ft)

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