The name '''' is not a coefficient or a problem parameter. You can only use dot notation to access the coefficients and problem parameters of a cfit or sfit, e.g., ''f.''.\n\nFor the current fit, you can access these properties: \n\nYou can get coefficient names and values either by name, e.g., p1 = f.p1, or by using the coeffnames or coeffvalues functions, e.g., names = coeffnames(f).\n\nTo use methods, use functional notation instead, e.g., plot(f)