Originally Posted by

**ramdrop** Hey:

Iv written this m-file, basically i want it to have a function, annd to plot it on a graph, then run another m-file within it to show the graph with small limits using its derivative, but when I run it, I don't get any results, i just get this:

f =

[]

Heres the m file:

function [ y ] = f( x )

% calculate f(x)=exp(x)

y=exp(x);

plot(x,f(x));

function [ y ] = fd( x )

% calculates fd(x)=exp(x)

y=exp(x);

plot(x,fd(x),'k')

pause

plot(x,(f(x+0.1)-f(x))/0.1,'r')

pause

plot(x,(f(x+0.01)-f(x))/0.01,'g')

pause

plot(x,(f(x+0.001)-f(x))/0.001,'b')

pause

plot(x,(f(x+0.0001)-f(x))/0.0001,'m')

end

end

cheerz