Calling multiple function files to plot in one figure

I would like to plot multiple functions that I have created for comparison in a single figure, in this case the comparison of Eulers forward method, Eulers backwards method and trapezoid method of approximation. How I would I go about this if the headers of the files are in the format FWD_Eulers(N,f,t0,tf)?

[Stephen23]

Perhaps something like

FwdVals = FWD_Eulers(N,f,t0,tf)
BwdVals = BWD_Eulers(N,f,t0,tf)
TpzVals = Trapezoidal(N,f,t0,tf)

and then plot those values using your choice of plotting routine. What have you tried so far?

Answer 1

[Unai San Miguel]

Although I don't know exactly what kind of plots you want to do, or what are the variables involved, sometimes it helps to use the simplest plotting functions: plot, plot3 for 1 independent variable or surf, contour for 2 independent variables. Many of the more advanced plotting functions do this.

The procedure is as follows:

1. Decide what kind of plot you want to do
2. Evaluate your functions over a grid of values for the independent variables
3. plot the points, or surf or contour them.

For instance, the fplot function allows you to plot a function (of 1 independent variable) from the equation of that function. But you can just calculate a number of points and use the simpler plot

Example in the documentation:

xt = @(t) cos(3*t);
yt = @(t) sin(2*t);
fplot(xt,yt)

Example with plot:

tp = linspace(-5, 5, 101);
xtp = cos(3 * tp);
ytp = sin(3 * tp);
plot(xtp, ytp, '-')