Generating a Plot For a Function, HELP

When i go to run this code, it just keeps telling me to 'Enter a Value:' and will not show me any plot. I understand that this is my input, but i just want it to plot the values of x for (-10:10). Am i using the right commands?

function output=myfun(x)

x=input('Enter a Value:');

if x<-2

    output=-x.^2;

elseif (-2<=x)&&(x<0)

    output=-2.*x;

elseif (0<=x)&&(x<=2) output=2.*x;

elseif x>2

    output=x.^2;

end

fplot(myfun(-10:10),output)

xlabel('x(m)')

ylabel('f(x)')

Answer 1

[Geoff Hayes]

David - the code is getting stuck due to its recursive nature. The line

 fplot(myfun(-10:10),output)

calls itself, passing the vector -10:10, only to reach this line again and again. So that is why the request for an input keeps popping up.

If you are just trying to plot the data from -10:10, then you can skip the request for an input and just define your function as follows

 function [output] = myfun(x)

   if x<-2
      output=-x^2;
   elseif (-2<=x)&&(x<0)
      output=-2*x;
   elseif (0<=x)&&(x<=2) 
      output=2*x;
   elseif x>2
      output=x^2; 
   end

Now to plot your above function for the interval [-10,10], just do something similar to what you had already, using fplot

 fplot(@myfun,[-10,10])

[David]

Thank you!