I have made this Matlab program and I always get the same error when i try to ru

Question

I have made this Matlab program and I always get the same error when i try to run it, what do i need to do.

Here is the program, and down below i will post the command Window.

classdef verkefni1

    methods (Static)
        function heimadami1
            clf;
            global A alpha
            A=0.5;
            alpha=1;
          
            f=@(x) gefid_fall(x);
            a=@(n) a_f(n);
            b=@(n) b_f(n);
            x=linspace(-3*pi,5*pi,1001);
            y=f(x);
            N1=2;   y1=hlutsumma(a,b,x,N1);
            N2=4;   y2=hlutsumma(a,b,x,N2);
            N3=8;   y3=hlutsumma(a,b,x,N3);
            figure(1)
            plot(x,y,x,y1,x,y2,x,y3)
            hold on
            legend('y=f(x)=max(1-|x-1|/0.5,0)',['y=s_{'-int2str(N1) '}(x)'],...
                ['y=s_{' int2str(N2) '}(x)'],...
                ['y=s_{' int2str(N3) '}(x)'])
            title('Fall f og hlutsummur Fourier-raðar þess')
            axis([-10,16,-0.2,1.8])              
        end
    end
    methods
        function y=hlutsumma(a,b,x,N)
            M=length(x);
            y=0.5*a(0)*ones(1,M);
            for n=1:N
                y=y+a(n)*cos(n*x)+b(n)*sin(n*x);
            end
        end
      
        function y=gefid_fall(x)
            global A alpha
            y=max(1-abs(mod(x,2*pi)-alpha/A,O));
        end
        function y=a_f(n)
            global A alpha
            if n==0
                y=A/pi;
            else
                y=2*cos(alpha*n)*(1-cos(A*n))/(pi*n^2*A);
              
            end
        end
    end
end

Command Window

>> verkefni1

ans =

verkefni1 with no properties.

>>

How do I get the program to print out the graf/plot.

Thank you

Explanation / Answer

These are some changes required to be made to the code:

The matlab code is pasted below:

classdef verkefni1

methods (Static)
function heimadami1
clf;  
global A alpha
A=0.5;
alpha=1;
  
f=@(x) verkefni1.gefid_fall(x);
a=@(n) verkefni1.a_f(n);
b=@(n) verkefni1.b_f(n);
x=linspace(-3*pi,5*pi,1001);
y=f(x);
N1=2; y1=verkefni1.hlutsumma(a,b,x,N1);
N2=4; y2=verkefni1.hlutsumma(a,b,x,N2);
N3=8; y3=verkefni1.hlutsumma(a,b,x,N3);
figure(1)
plot(x,y,x,y1,x,y2,x,y3)
hold on
legend('y=f(x)=max(1-|x-1|/0.5,0)',['y=s_{'-int2str(N1) '}(x)'],...
['y=s_{' int2str(N2) '}(x)'],...
['y=s_{' int2str(N3) '}(x)'])
title('Fall f og hlutsummur Fourier-raðar þess')
axis([-10,16,-0.2,1.8])   
end
end
methods (Static)
function y=hlutsumma(a,b,x,N)
M=length(x);
y=0.5*a(0)*ones(1,M);
for n=1:N
y=y+a(n)*cos(n*x)+b(n)*sin(n*x);
end
end
  
function y=gefid_fall(x)
global A alpha
y=max(1-abs(mod(x,2*pi)-alpha/A),0);
end
function y=a_f(n)
global A alpha
if n==0
y=A/pi;
else
y=2*cos(alpha*n)*(1-cos(A*n))/(pi*n^2*A);
  
end
end
function y=b_f(n)
global A alpha
if n==0
y=A/pi;
else
y=2*cos(alpha*n)*(1-cos(A*n))/(pi*n^2*A);
  
end
end
end
end

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