Why the loop return only the last element ?

Question

Luiz Felippe 2013-4-10

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/71494-why-the-loop-return-only-the-last-element

I'm trying to change the size of subplots using a for loop.So what I really want to do is this:

 clear
n=9;
pos=cell(1,n);
for i=1:n
    a(i)=subplot(n,1,i);
    pos{i}= get(a(i),'position');
    if i<9
        set(gca,'xtick',[])
    end
    pos{i}(1,4)=(pos{i}(1,4))/2;
    set(a(i),'position',pos{i});
end
pos{8}(1,2)=(pos{8}(1,2)) -  0.045;
pos{7}(1,2)=(pos{7}(1,2)) -  0.09;
pos{6}(1,2)=(pos{6}(1,2)) -  0.1350;
pos{5}(1,2)=(pos{5}(1,2)) -  0.18;
pos{4}(1,2)=(pos{4}(1,2)) -  0.2250;
pos{3}(1,2)=(pos{3}(1,2)) -  0.2700;
pos{2}(1,2)=(pos{2}(1,2)) -  0.3150;
pos{1}(1,2)=(pos{1}(1,2)) -  0.3600;
set(a(8),'position',pos{8});
set(a(7),'position',pos{7});
set(a(6),'position',pos{6});
set(a(5),'position',pos{5});
set(a(4),'position',pos{4});
set(a(3),'position',pos{3});
set(a(2),'position',pos{2});
set(a(1),'position',pos{1});

But,I want to do this in a easier way .So I tried make all this using just a for loop :

 clear
n=9;
pos=cell(1,n);
 for i=1:n
    a(i)=subplot(n,1,i);
    pos{i}= get(a(i),'position');
    if i<9
        set(gca,'xtick',[])
    end
    pos{i}(1,4)=(pos{i}(1,4))/2;
    for d=8:-1:0
    y(d+1)=0.045*d;
    t=fliplr(y);
    end
    pos{i}(1,2)=(pos{i}(1,2))-t(i);
    set(a(i),'position',pos{i});
   end

The point is that this code return only the last element.I mean,just the subplot(9,1,9).

How can I solve this ?

Thanks, Luiz

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Answer 1

Ahmed A. Selman 2013-4-10

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/71494-why-the-loop-return-only-the-last-element#answer_81802

It is a little tricky how loops are working in any program, aren't they? You used subplot and set and get within the same loop, this seems confusing matlab, and honestly I do not know exactly why. Also you calculated the values of (t) for 9 times.. which is needed only once.

So, try the code below, it may solve the problem:

clear
n=9;
pos=cell(1,n);
for d=8:-1:0
    y(d+1)=0.045*d;
    t=fliplr(y);
    end
for i=1:n
    a(i)=subplot(n,1,i);
    pos{i}= get(a(i),'position');
end 
for i=1:n
    if i<9
        set(gca,'xtick',[])
    end
    pos{i}(1,4)=(pos{i}(1,4))/2;
    set(a(i),'position',pos{i});
    pos{i}(1,2)=(pos{i}(1,2)) -  t(i);
    set(a(i),'position',pos{i});
end