DEW1

DEW1 draws the solution of differential equation of first order with initial values t0 and y0. Program also draws the direction field.

Drawing (Initial values)

Solution is drawn with initial values t0 and y0. Values can be written to t= and y= textfields and clicking the Draw -button. Or values can be pointed with a mouse.

Equation

Differential equation may be selected from the pre-defined examples or may by defined by user. For example equation:

y' - 3*y + 2*t = 0

is first solved for y':

y' = 3*y - 2*t,

then the right side of equation is given to the program:

3*y - 2*t.

Finally click the Read equation -button.

Changing the scale (Scale)

The scale can be adjusted by chancing the values of tmin, tmax, ymin and ymax and clicking the Change scale -button.

Numerical method (General)

The solution may be plotted by using one of the following algoritms: adaptive Runge-Kutta, Euler, improved Euler, Runge-Kutta or Adams-Bashforth.

For non-adaptive methods the stepsize may be adjusted via the Stepsize -textfield.

Clearing (General)

Clear -button clears everything that has been drawn.

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