How can i get the numerical value of a variable?

I'm using the ode45 (x,y) for solve an open channel flow problem (plot the surface profiles). It is working, I've already do that but I need the flow depth numerically (y) at the end of my channel (x=xmax). How can I get it?

Answer 1

[Star Strider]

If you need the very last values of your x and y vectors, use end (or length or size as alternatives), for example:

flow_depth = y(end,:);

or:

flow_depth = y(length(x),:);

[Lorincz]

Sorry. I'm very new in Matlab and it isn't working. (Forgot to say that is that an m-file.) i hope you can help with that too. Thanks

[Star Strider]

What does ‘it isn't working’ mean?

It should be returning the last row of your y matrix to the ‘flow_depth’ variable.

The output of ode45 will be a (Nx1) column vector of x-values and an (NxM) matrix of y-values that correspond to the solutions at each value of x.

[Lorincz]

my fault, it's working now. thank you for your help

[Star Strider]

My pleasure!

I’m glad you got the problem sorted out.