
Euler's method
Consider the equation dz/dx = z^2 given z(0)=1 and delta x = .25, computer z(0.25) and z(.5). Using Euler's method compare to the exact solution z= 1/(1x)
solve the above question using Euler's improved method, compare to the exact solution
Here is what I get. I am not in a diffiq class, this is a computer methods course. Nor have I ever taken diffiq.
My answer for the first part.
x z actual error
0 1 1 0
0.25 0.75 1.333333333 43.75%
0.5 0.609375 2 69.53%
So as you can see, my error is way off.
How I found z was z1 + .25 * z1^2
so z3 would be z2 + .25 * z2^2
Is that correct?
Here is what I get from the improved method, and this seems to be rather screwed up.
x f est 1 y est 1 f est 2 yest 2 actual error
0 1 1 0 1 1
0.25 0.0625 1.000976563 0.062530518 1.000978 1.333333 0.249267
0.5 0.015625 1.001038552 0.117317319 1.004418 2 0.497791
f est 1 = x^2 * y est 2
y est 1 = y est 2 + (.25* f est 1^2)
f est 2 = f est 1  (x^2 * y est 1)/2
y est 2 = y est 2 +(.25 *(f est 2^2))
Those are the equations I am getting the numbers from.
thanks

Well, I tried to fix the formating.