x=0.46:0.01:0.49;
f=[0.4846555,0.4937542,0.5027498,0.5116683];
format long
interp1(x,f,0.472)
interp1(x,f,0.472,'nearest');
interp1(x,f,0.472,'pchip');
interp1(x,f,0.472,'spline');