The differential equation is given as follows:
ODE: y′′ = f(x, y, y′)
with the initial values
y(x0) = y0 and y′(x0) = y′0
The solution of the general differential equation 2.order is calculated numerically. The method can be selected. Three Runge-Kutta methods are available: Heun, Euler and Runge-Kutta 4.Order. The initial values for y0 and y′0 can be varied by pulling the dots in the charts. The value for x0 can be set in numeric input field right. In the function up to three parameters a, b and c can be used which can be varied by means of the slider in the upper graph. In state-space diagram the solutions y1 and y2 of the corresponding general first order differential equation system are applied. The diagram shows y2 over y1. The number of grid vectors in state-space diagram can be set in the numeric field for the grid points. In the state-space diagram is plotted y2 on the vertical axis and y1 about the horizontal axis.
Grap the start point to move the initial values. The grid vectors show the initial direction if the ODE starts at this points.
f(x, y, ys) =
|sin(x)||Sine of x|
|cos(x)||Cosine of x|
|tan(x)||Tangent of x|
|acos(x)||arccosine of x|
|atan(x)||arctangent of x|
|atan2(y, x)||Returns the arctangent of the quotient of its arguments.|
|cosh(x)||Hyperbolic cosine of x|
|sinh(x)||Hyperbolic sine of x|
|pow(a, b)||Power ab|
|sqrt(x)||Square root of x|
|log(x), ln(x)||Natural logarithm|
|log(x, b)||Logarithm to base b|
|log2(x), lb(x)||Logarithm to base 2|
|log10(x), ld(x)||Logarithm to base 10|
With a substitution the differential equation of second order can be transformed to a differential system of first order.
y1 = y
y2 = y′
So the resulting ODE system of 1.order is:
y1′ = y2
y2′ = f(x, y1, y2)
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