It looks like [y;y']=[a,b] would mean y(0)=a and y'(0)=b, but a first order differential equation should have one initial condition y(t0)=y0.
Thanks Tim, yes, I did a mistake in the equation, its a 2nd order.
Project Euler: Problem 7, Nth prime
Sum of first n terms of a harmonic progression
Create an 'arrow-head" matrix
Sum of diagonals elements of a matrix
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