Right code for Centred finite difference?

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Sakusan Puwanendran
Sakusan Puwanendran 2017-11-24
Is this the right code to find the Centred finite difference and plot it on a graph? My plot looks wrong. The centred difference is in yellow
y=2*cos(3*x)-x.^2+7*x-6;
diff(y,x)
dydx_actual=diff(y,x)
clear x
h=0.1;
x=0:h:6;
%CFD
dydx_cfd=(y(3:end)-y(1:end-2))./h;
plot(x(2:end-1),dydx_cfd,'y')

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