my code continuously showing undefined variable or function

Question

Shahrin Islam 2018-10-20

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/425109-my-code-continuously-showing-undefined-variable-or-function

评论： Shahrin Islam 2018-10-22

hello everyone. I am trying to run a code but it's giving me error saying 'undefined variable or function X1' and sometimes it says 'undefined variable and function X2'. i am attaching the code below. Please help me on this.

clc;clear all;close all
s=600;
V = VideoReader('2.mp4');
Is=read(V,[1 s]);
r=240;c=320;
r1=round(r*0.4);r2=round(r*0.94);
ch=160;
ri=r2-r1;
for i=1:2:s
    tic
    C=Is(:,:,:,i);
    CI=C(r1:r2,:,:);%»&reg;·Ö%»&reg;·Ö
    G=rgb2gray(CI);%±ä»Ò
    %%Ñ°ÕÒãÐÖµ
    g=G(:);
    mu=mean(g);
    g=single(g);sige=std(g);%±ê×¼²î
    %ãÐÖµ
    T=mu+3*sige;
    %Ä£°åB
    B=G>T;    
    t=0;
    for u=1:ri
        for v=ch:-1:1
            if B(u,v)
                t=t+1;
                Y1=u+r1;
                X1=v;
                break
            end
        end
    end
    t=0;
    for u=1:ri
        for v=ch:c
            if B(u,v)
                t=t+1;
                Y2=u+r1;
                X2=v;
                break
            end
        end
    end
    p1=polyfit(X1,Y1,1);
    p2=polyfit(X2,Y2,1);
    x1=1:10:ch;x2=ch:10:c;
    F1=x1.*p1(1)+p1(2);
    F2=x2.*p2(1)+p2(2);
    toc
    figure(1),imshow(C),hold on
    plot(x1',F1,'g',x2',F2,'g','LineWidth',2)
    title(i)
    hold off
    mov(i)=getframe(gca);
end
movie2avi(mov,'F1´¦Àíºó');

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Answer 1

Rik 2018-10-20

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/425109-my-code-continuously-showing-undefined-variable-or-function#answer_342430

编辑：Rik 2018-10-20

There are two main problems with the loops you have set up: you run the risk of not defining your variables (which is causing your errors) and they are very inefficient.

Replace this

t=0;
for u=1:ri
    for v=ch:-1:1
        if B(u,v)
            t=t+1;
            Y1=u+r1;
            X1=v;
            break
        end
    end
end
t=0;
for u=1:ri
    for v=ch:c
        if B(u,v)
            t=t+1;
            Y2=u+r1;
            X2=v;
            break
        end
    end
end

with this

[u,v]=deal(1:r1,ch:-1:1);
[u_ind,v_ind]=find(B(u,v))
if ~isempty(u_ind)
    [u_ind,v_ind]=deal(u_ind(end),v_ind(end));
    Y1=u(u_ind)+r1;
    X1=v(v_ind);
else
    %prevent Y1 from not being defined
    Y1=0;X1=0;
end
[u,v]=deal(1:r1,ch:c);
[u_ind,v_ind]=find(B(u,v))
if ~isempty(u_ind)
    [u_ind,v_ind]=deal(u_ind(end),v_ind(end));
    Y2=u(u_ind)+r1;
    X2=v(v_ind);
else
    %prevent Y2 from not being defined
    Y2=0;X2=0;
end

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Rik 2018-10-21

My updated code has the same functionality as your code, except for the case where they would be undefined. You will have to think about what value they should have in case the code that replaced the double loop fails.

Shahrin Islam 2018-10-22