Index in position 1 exceeds array bounds (must not exceed 1).

Hi Every one I am trying to run the follow grdeint but it give me Index in position 1 exceeds array bounds (must not exceed 1). please can you help me to find the problem and how i can fix it.

>> [x,y]=meshgrid(-2*pi:0.1:2*pi,-2*pi:0.1:2*pi);
>> z=acos(cos(sqrt(x^2 +x^2)))+acos(sin(x));
>> mesh(x,y); axis image;
>> options={,'interpreter','latex','fontSize',14};% Use LATEX for labeling
>> options={,'interpreter','latex','fontSize',14};% Use LATEX for labeling
>> title('Asecent',options{:});
>> hold on
>> p=[-1.5,-6];
>> plot(p(1,1),p(1,2),'or','MarkerSize',10);
>> for i=1:71
x=p(1,size(p,2));
y=p(2,size(p,2));

[Walter Roberson]

p=[-1.5,-6];

makes p a 1 x 2 vector. indexing at (2,anything) is going to fail on a 1 x something array.

[Yousif Hamzah]

so what is your suggestion please

[the cyclist]

I can't tell what you intend to do with the code

for i=1:71
    x=p(1,size(p,2));
    y=p(2,size(p,2));
end

so I can't make a suggestion on how to fix it. Maybe you can explain what you want those lines of code to do?

[the cyclist]

Yousif wrote the following as an answer, instead of a comment:

"I just put iot randamlly no idea which code should I put"

[the cyclist]

You do not know what code to put. That is OK.

But what are you trying to do? What are you trying to add to your figure? We can help with the code, but not if we don't know what you are trying to DO.

[Walter Roberson]

Your for i=1:71 is not suggestive to us, since your x and y and z are 126 x 126.

Are you trying to loop through all (x,y) pairs?

xy = [x(:), y(:)];
for i = 1 : size(xy,1)
    thisx = xy(i,1); thisy = xy(i,2);
end