MATLAB: Show derivatives vector on a plot.

derivativedirectionhermiteinterpolationplotpoint

I've a curve plotted by the command plot(xx,oo) where xx and oo are coefficients obtained with Hermite interpolation method.

Now i want to show a little vector corresponding of some points (that i know) on the curve, that shows the derivative direction in these points.

Thank you

Just use arrow or arrow3 with start-point at the corresponding point and end [dx,dy] away.

You could use diff, e.g.,

dIdxdy = diff( diff(I,1,1), 1,2);

Or, for maximum flexibility, you could use convolution. For example, if you want central differences,

dx=[1;0;-1];
dy=dx.';
dIdxdy=convn(  convn(I,dx,'same')   ,dy,'same');

I can!

Try this:

syms x(t);
Dx = diff(x);
Dx2 = diff(x,2);
x(t) = dsolve(Dx2+(5*Dx)+(6*x)==100,x(0)==0,Dx(0)==0)
figure(1)
fplot(x, [0 10])
axis([xlim    0  17])
grid