I think you were on the right track with
Conversion_Eff=Conversion_Eff(Conversion_Eff~=0);
Accel=Accel(Conversion_Eff~=0);
But I would do this instead:
Index = [Conversion_Eff ~= 0];
Converserion_Eff = Conversion_Eff(Index);
Accel = Accel(Index);
Storing the index first is important, otherwise the 2nd comparison Conversion_Eff ~= 0 is with the already modified vector, Conversion_Eff which should not contain any 0 values.
Best Answer