Question

Construct a table comparing the indicated values $\mathit{y}\mathbf{\left(}\mathit{x}\mathbf{\right)}$of using Euler's method, the improved Euler's method, and the RK4 method. Compute to four rounded decimal places. First use $\mathit{h}\mathbf{=}\mathbf{0}\mathbf{.}\mathbf{1}$and then use $\mathit{h}\mathbf{=}\mathbf{0}\mathbf{.}\mathbf{05}$.

$$\begin{gathered} \mathit{y}\mathbf{=}\mathbf{2}\mathit{I}\mathit{n}\mathit{x}\mathit{y}\mathbf{,}\mathbf{}\mathit{y}\mathbf{\left(}\mathbf{1}\mathbf{\right)}\mathbf{=}\mathbf{2}\mathbf{;} \\ \mathit{y}\mathbf{(}\mathbf{1}\mathbf{.}\mathbf{1}\mathbf{)}\mathbf{,}\mathbf{}\mathit{y}\mathbf{(}\mathbf{1}\mathbf{.}\mathbf{2}\mathbf{)}\mathbf{,}\mathbf{}\mathit{y}\mathbf{(}\mathbf{1}\mathbf{.}\mathbf{3}\mathbf{)}\mathbf{,}\mathbf{}\mathit{y}\mathbf{(}\mathbf{1}\mathbf{.}\mathbf{4}\mathbf{)}\mathbf{,}\mathbf{}\mathit{y}\mathbf{(}\mathbf{1}\mathbf{.}\mathbf{5}\mathbf{)} \end{gathered}$$

Short answer

So, the required value is$R{k}_4$

Step-by-step solution

Definition of Euler's method

The Euler method is a first-order method, which means that the local error (error per step) is proportional to the square of the step size and the global error (error at a given time) is proportional to the step size.

Evaluation

Given initial value problem is $y=2Inxy,y\left(1\right)=2$

So $f(x,y)=2Inxy,x_0=1,y_0=2$

For $h=0.1$

we get

$x\left(n\right)$

For $y\left(n\right)$we get

$R{k}_4$

I got these values by running programmed in MATALAB with this problem input.