How to fix "Error using > Matrix dimensions must agree" ?

How to fix the problem?

My code is like this

if load(sun,1) > pv (sun,1); POL = SUM;
    yy = load(sun,1) - pv (sun,1); % (Eksik olan Enerjinin Degeri)
    yy1(sun,1) = double (yy);
    yy2 = sum (yy1); % importanttttttttttttttttttttttttt(Eloss)
    QQS = find(yy1<640.0184);
    QQa = yy1(QQS);
    QQL = find (yy1>640.0184);
    QQb = yy1(QQL);
    TOtal = sum (QQb);
    v = pemfc(find( pemfc > QQa(:,1) , 1 ) ); % very important (Eksik olan enerjinin PEMFC'daki belirli aralikta çalismasi)
    x = v ; % (Eksik olan enerjinin - olarak gösterilmesi)
    j(sun,1) = double (x); % (toplam Eksik olan enerjinin PEMFC'daki belirli aralikta çalismasi)
    h2miktar = (j*(213.3395/640.0184));                %(depo(q,1))
    m = double (h2miktar); % (Hidrojen miktari)     (m(q,1))
    h2t = sum(m); % Toplam Hidrojen Miktari
    h2t2 = h2t - (h2+ POL);
    RemainingPower = (h2t2*640.0184)/213.3395;
    TOTALremain = RemainingPower + TOtal;
    Lossofload = TOTALremain/Load;
    Q1 =find(m>0);
    answer1 = m(Q1);
    WWW = sum(answer1);
   end
    

The error shows me the following line:

Error using > Matrix dimensions must agree.

Error in LAST (line 55)

v = pemfc(find( pemfc > QQa(:,1) , 1 ) );

Something is wrong with "QQa" variable. I want to find first maximum value from pemfc file for QQa parameter.

by the way pemfc = [0

14.6160000000000

27.2182400000000

39.5606400000000

51.4483200000000

63.2548000000000

100.1262400000000

150.7378400000000

200.8297600000000

225.743040000000]

and QQa = [60

60

60

60

3.39799267351160

205.646953910377

220.663912150683

206.033491851057 ]

For Firs value of QQa it select first maxumum values like (63.2548000000000)

For second value of QQa it select first maxumum values like (63.2548000000000)

For sixth value of QQa it select first maxumum values like (225.743040000000)

and so on

Thanks in advance.

[Walter Roberson]

pemfc has 10 rows but QQa has 9 rows. What do you intend when you use > between the two of them?

[Mohammad Sulaiman Stanekzai]

Dear Roberson thanks for your comment.

I want to find first maximum values for QQa and must be take from pemfc.

[Joel Handy]

pemfc > QQa(:,1)

This code does an elementwise comparison of pemfc and QQa(:,1). Thats why you are getting a matrix dimension error. Generally its worth avoiding for loops (hence the comment and not an official answer), but for the purposes of explaining the problem, what you are really want to do is. . .

for idx = 1:numel(QQa(:,1))
    v(idx) = pemfc(find( pemfc > QQa(idx,1) , 1 ) );
end

[Mohammad Sulaiman Stanekzai]

Thank you soo much Dear Sir. It worked perfectly