求助：
我用matlab拟合时出现：
Fit could not be computed due to error:
NaN computed by model function, fitting cannot continue.
Try using or tightening upper and lower bounds on coefficients.
但是我把横坐标除以3600后，就行了。原来横坐标是以秒为单位，
除以3600后变成以小时为单位了。我很希望得到以秒为单位的结果，所以求助！谢谢！
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