"Andres " <email@example.com> wrote in message <firstname.lastname@example.org>... > Hello. > > I am using the curve fitting tool's generated code to obtain coefficient values for different functions that I'm adjusting to some data. > > One problem I often encounter with the data sets, though, is that the best fit that the code finds for the coefficients leads to a negative slope at the very beginning of the data. Since I'm doing this to obtain a material model, this initial negative slope doesn't really make sense and will cause computing problems when I use the coefficient values in a model. So the ideal solution would be to make the code such that the slope is always positive in the range of the minimum and maximum x-values. > > I can solve this by constraining the coefficient values either on CFTOOL or in the code itself. But I'd prefer to do it automatically, by a code, since this way I have to keep rewriting things. Is there an 'easy' way of doing this (i.e. adding a code to the current cftool-generated code that forces a condition), or would I have to start from scratch? > > This is a sample of the code: >
> > Any help would be appreciated.
Use a tool (SLM) that is designed from the start to help you do this.