Hi,

I have matrixes A={{1,1}},B={{z, 0}, {0, z}} and C=Transpose[A]. After multiplying A.B.C I get expected result {{2z}}. Furthermore I tried to define function f[z_]:=A.B.C and plot graph of this function like Plot[f[a],{a,1,2}]. Now I did not get expected result, the linear function, but I got empty plot. Where I do a mistake? Help me, please.