Wrong plot with ode15s

Question

Sam 2017-12-21

回答： Star Strider 2017-12-21

I'm trying to plot the solution for the following differential equation

function y=probleemvergelijking(t,x)
y = (-100*x + 1 + 100*t);

Then i solve it with ode15s...

[y,t] = ode15s(@probleemvergelijking, [0 50], 1);
plot(y,t)

But the plot is just a straight line... What did i do wrong?

Answer 1

Star Strider 2017-12-21

You did nothing wrong, really.

Try this:

[t,y] = ode15s(@probleemvergelijking, [0 50], 1);
semilogx(t,y)

Your function stays near zero for a few values of ‘t’, then rapidly approaches 50 because the ‘100*t’ term predominates.