MATLAB: How to correct for loop

for loop

sarfse

Best Answer

A = [ 1     0     0     4
     1     0     3     4
     1     2     0     4
     1     2     3     4];
D = [         0   22.2794   33.7859   45.0000
   22.2794         0   15.4008   23.0367
   33.7859   15.4008         0   14.9726
   45.0000   23.0367   14.9726         0];
d = size(A);
B = nonzeros(A');
jj = [B(1:end-1),B(2:end)];
jj = jj(diff(jj,1,2) > 0,:);
k = cumsum([true;diff(jj(:,1))<=0]);
idx = sub2ind(d,jj(:,1),jj(:,2));
t = jj(:,1) == 1;
p = 50*t;
p(~t) = 180;
result = accumarray(k,D(idx).*p);

Related Solutions

MATLAB: How to make simpler this at ‘if condition’

I am not certain this is more efficient than your code, however it takes advantage of the repeating patterns to make it simpler:

a = randi(9, 6, 9);                                                 % Create ‘a’
C1 = 4 : 4 : 32;
ahatfcn = @(k) [a(1,k),a(2,k),a(3,k),a(4,k),a(5,k),a(6,k)];         % Create Anonymous Function
for ii = 1 : 40                                                     % Loop Over ‘ii’
    if ii < 5
        ahat = ahatfcn(1);
    else
        for k1 = 1:numel(C1)
            if ((C1(k1)<ii) && (ii<(C1(k1)+5)))
                ahat = ahatfcn(k1+1);
            end
        end
    end
end
a = ahat

It runs without error. I defer to you to determine if it produces the result you want.

MATLAB: How to find non-zero indexes (or value) in row in matrix, and make taken results i and j elements of another matrix Dij

E.g., using a loop:

m = size(A,1);
result = zeros(m,1);
for k=1:m
    x = find(A(k,:));
    for n=2:numel(x)
        result(k) = result(k) + Dij(x(n-1),x(n));
    end
end

Best Answer

Related Solutions

MATLAB: How to make simpler this at ‘if condition’

MATLAB: How to find non-zero indexes (or value) in row in matrix, and make taken results i and j elements of another matrix Dij

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