Plot a graph and its derivatives

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Kosmas-Damianos Giannakos
回答： Ced 2016-3-18
syms x y; f=@(x)sin(x.^2).*cos(x); dy=diff(f(x)) df=@(x)subs(dy); diff(f(x),2); dy2=diff(f(x),2); df2=@(x)subs(dy2); x=linspace(-pi,pi,25); plot(f(x),x)
I am trying to plot in the graph together with the original function the first and the second derivative , with the plot command any help on how to approach this step?

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回答（1 个）

Ced
Ced 2016-3-18
You basically have it. The plot function format is "plot(x,y)" though, meaning x coordinates and y coordinates, so your version is probably the mirrored image of what you want. You can just append the rest.
plot(x,f(x),x,df(x),x,df2(x))
xlim(x([ 1 end ]))
grid on
xlabel('x')
ylabel('y')
legend('f(x)','df(x)','ddf(x)')

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