Hello, I'm trying to make some calculation with vectors and matrix, with functions as sin, cos and operators, but comparing with excell...it gives me differences of 0,0004...I have tried with vpa, but..someone can help me please?

teta_transmis(1,1)=teta+beta(1);%calculul primei orientari if teta_transmis(1,1) > 400 teta_transmis(1,1)=teta_transmis(1,1)-400; end n=length(beta); for i=2:n teta_transmis(i,1)=vpa(teta_transmis(i-1,1)+200+beta(i),50); if teta_transmis(i,1)>400 teta_transmis(i,1)=vpa(teta_transmis(i,1)-400,50); end; end; I have made the differences and it gives me the 0.0004 value...it remains constant... I don't know how to explain why...