having error "Attempt to execute SCRIPT plot as a function: C:\Azam\no​n-linear\f​iles\plot.​m" in matlab when I want to plot

Hi every one.

I want to plot s/th in matlab, I don't know why it plots sometimes and some time it doesn't plot and give me this error"

"Attempt to execute SCRIPT plot as a function:

C:\Azam\non-linear\files\plot.m

Error in goal11 (line 44)

plot(ys(:,1),ys(:,2))"

I will be pleased if every one can help me. because this probmel occurs for me very much recently in different mfiles.

Thanks

My code is:
clear all; close all; clc
%f = @(t,V) [-1-V(1).^2; -V(2)];
%f = @(t,V) [10*V(2);0];
%f= @(t,V) [1.5*V(1)+2*V(2);-2*V(1)-0.5*V(2)];
f1=@(t,V)[-1.5*V(1)+V(2);(V(1)+V(2))*sin(V(1))-3*V(2)];
f2=@(t,V)[-2*V(1)-V(2).^3;(V(1)-V(2))];
v1 = linspace(-10,10,50);
v2 = linspace(-10,10,50);
[x,y] = meshgrid(v1,v2);
size(x)
size(y)
u = zeros(size(x));
v = zeros(size(y));
s = zeros(size(x));
z = zeros(size(y));
t=0; % we want the derivatives at each point at t=0, i.e. the starting time
for i = 1:numel(x)
    Yprime = f1(t,[x(i); y(i)]);
    Yprim = f2(t,[x(i); y(i)]);
    u(i) = Yprime(1);
    v(i) = Yprime(2);
    s(i)= Yprim(1);
   z(i) = Yprim(2);
end
 figure(1)
 quiver(x,y,u,v,'r'); 
hold on;
 quiver(x,y,s,z,'b');
 
%figure(gcf)
xlabel('V1')
ylabel('V2')
axis tight equal;
 figure(2)
 for y10=[-2 5 10 16 20]
for y20 = [-4 1 7 13 20]
   [ts,ys] = ode45(f1,[0,13],[y10;y20]);
   [ts1,ys1] = ode45(f2,[13,16],[y10;y20]);
   [ts2,ys2] = ode45(f1,[16,20],[y10;y20]);
   [ts3,ys3] = ode45(f2,[20,22],[y10;y20]);
   [ts4,ys4] = ode45(f1,[22,35],[y10;y20]);
   [ts5,ys5] = ode45(f1,[35,40],[y10;y20]);
  
    plot(ys(:,1),ys(:,2))
     hold on;
    plot(ys(1,1),ys(1,2),'bo') % starting point
     hold on;
     plot(ys(end,1),ys(end,2),'ks') % ending point
    hold on;
%     plot(ys1(:,1),ys1(:,2))
%     plot(ys1(1,1),ys1(1,2),'bo') % starting point
%      plot(ys1(end,1),ys1(end,2),'ks') % ending point   
%      hold on;
%     plot(ys2(:,1),ys2(:,2))
%       hold on;
%     plot(ys3(:,1),ys3(:,2))
%       hold on;
%     plot(ys4(:,1),ys4(:,2))
%     
%       hold on;
%     plot(ys5(:,1),ys5(:,2))
    end
end

Answer 1

[Steven Lord]

Rename the file C:\Azam\non-linear\files\plot.m to something else. While it exists in the current directory or in a directory on the MATLAB search path with that name, you will not be able to use the built-in plot function.

[azam ghamari]

Thank you .

[Hakan Özhan]

Thank you both of you :)