How to change the axis location for multiple subplots ?

I try to change the axis location for 2 subplots

when I entered this code

 n = [-5:5];
x = 2*impseq(-2,-5,5) - impseq(4,-5,5);
subplot(2,2,1);
stem(n,x);
ax=gca;
ax.XAxisLocation = 'origin';
ax.YAxisLocation = 'origin';
title('Sequence in Problem 2.1a');
xlabel('n'); ylabel('x(n)');
ax.Box = 'off';
ax.Layer = 'top';
n = [0:20]; 
x1 = n.*(stepseq(0,0,20)-stepseq(10,0,20));
x2 = 10*exp(-0.3*(n-10)).*(stepseq(10,0,20)-stepseq(20,0,20));
x = x1+x2;
subplot(2,2,3); 
stem(n,x);
ax.XAxisLocation = 'origin';
ax.YAxisLocation = 'origin';
title('Sequence in Problem 2.1b');
xlabel('n'); ylabel('x(n)');

It changes it for the first subplot only ..why is this?

Answer 1

[Jan]

Because your

ax.XAxisLocation = 'origin';
ax.YAxisLocation = 'origin';

concerns the same object "ax". Try this:

ax2 = subplot(2,2,3); 
stem(n,x);
ax2.XAxisLocation = 'origin';
ax2.YAxisLocation = 'origin';

Note that

ax = subplot(2,2,1);

is safer than;

subplot(2,2,1);
stem(n,x);
ax=gca;

If the user clicks around in the GUI during stem works, the current axes replied by gca is changed. Better catch the handles directly from the function, which creates the objects instead of searching them afterwards by gca or gcf.

[omar khater]

It doesn't change the result

[Jan]

@omar: I cannot guess what you have done. I tried to guess what "I try to change the axis location for 2 subplots" means already, but perhaps you meant something else. Maybe you made a type when implementing my suggestion.

Please explain the problem more specifically.

[omar khater]

As you see in the attached image

I want the subplot 2,3 to be as 1

and here is the code

 n1 = -5:5;
x1 = 2*impseq(-2,-5,5) - impseq(4,-5,5);
ax=subplot(2,2,1);
stem(n1,x1);
ax.XAxisLocation = 'origin';
ax.YAxisLocation = 'origin';
title('Sequence in Problem 2.1a');
xlabel('n1'); ylabel('x(n1)');
ax.Box = 'off';
ax.Layer = 'top';
n2 = 0:20; 
x_1 = n2.*(stepseq(0,0,20)-stepseq(10,0,20));
x_2 = 10*exp(-0.3*(n2-10)).*(stepseq(10,0,20)-stepseq(20,0,20));
x2 = x_1+x_2;
ax2 = subplot(2,2,3);
stem(n2,x2);
ax2.XAxisLocation = 'origin';
ax2.YAxisLocation = 'origin';
title('Sequence in Problem 2.1b');
xlabel('n2'); 
ylabel('x(n2)');
n3 = 0:50; 
x3 = cos(0.04*pi*n3)+0.2*randn(size(n3));
ax3=subplot(2,2,2);
stem(n3,x3);
ax3.XAxisLocation='origin';
ax3.YAxisLocation = 'origin';
title('Sequence in Problem 2.1c')
xlabel('n3');
ylabel('x(n3)');

[Jan]

@omar khater: While "I want the subplot 2,3 to be as 1" is clear to you, the readers have to guess, what this means. Remember that I do not have the faintest idea about what you want.

 As you see in the attached image, I want...

The image shows, what you get, but not what you want instead.

The posted code does exactly, what is expected. The locations of the axes are moved to the corresponding origins - this is on the left for the upper right axes, and on the left bottom corner for the lower axes. So please explain exactly what does not appear as you want.

[omar khater]

I want the axis of plots 2,3 to be in the middle of the graph as in plot 1

The image shows that the axis in the plot 3 doesn't change as I expect