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diff: second argument must be a variable; found −2.275914667349908

#0: lambda([x],diff(%%,x))(x=-2.275914667349908)(lsquares.mac line 290)

#1: lsquares_estimates_exact(mse=('sum(('data[i,2]+2.275914667349908*'data[i,1]-20.54452002925503)^2,i,1,30))/30,parameters=[-2.275914667349908,20.54452002925503])

#2: lsquares_estimates(data=matrix([1.26,17.6],[1.55,16.9],[2.08,15.5],[2.26,15.0],[2.39,14.7],[2.7,13.9],[3.12,12.8],[3.45,12.0...,variables=[U,I],equation=I = 20.54452002925503-2.275914667349908*U,parameters=[-2.275914667349908,20.54452002925503],optional_args=[])(lsquares.mac line 245)

 -- an error. To debug this try: debugmode(true);