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how can i make a general matrix?

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arian hoseini
arian hoseini 2022-1-8
评论： arian hoseini 2022-1-9
i asked this question many times but still have a problem....someone help me please i need answer as soon as possible...
  2 个评论
John D'Errico
John D'Errico 2022-1-8
编辑：John D'Errico 2022-1-8
I see you still have problem. However, the issue is you need to EXPLAIN clearly what you need. If you cannot explain what your goal is, how can you expect help?
Is this matrix symmetric? That is, is it true that x(i,j) == x(j,i) always? The rule for x12 that you show would seem to say that is true.
Would x(2,2) be the sum of 5 elements? Thus... sum(L([1 4 5 6 7],4))?
Finally, it really helps if you post actual code, rather than a PICTURE of code. For example, while I can look at the matrix L, I cannot paste it into MATLAB.
arian hoseini
arian hoseini 2022-1-8
thats on me and im sorry for my explanation
L =[1 2 0.1 0.2 0.02
1 4 0.05 0.2 0.02
1 5 0.08 0.3 0.03
2 3 0.05 0.25 0.03
2 4 0.05 0.1 0.01
2 5 0.1 0.3 0.02
2 6 0.07 0.2 0.025
3 5 0.12 0.26 0.025
3 6 0.02 0.1 0.01
4 5 0.2 0.4 0.04
5 6 0.1 0.3 0.03]
%-------------------------------Program strat her--------------------------
nl = L(:,1); nr = L(:,2); R = L(:,3);
X = L(:,4); Bc = j*L(:,5);
nbr=length(L(:,1)); nbus = max(max(nl), max(nr));

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采纳的回答

Torsten
Torsten 2022-1-8
编辑：Torsten 2022-1-8
function main
L = [1 2 0.1 0.2 0.02; ...
1 4 0.05 0.2 0.02; ...
1 5 0.08 0.3 0.03; ...
2 3 0.05 0.25 0.03; ...
2 4 0.05 0.1 0.01; ...
2 5 0.1 0.3 0.02; ...
2 6 0.07 0.2 0.025; ...
3 5 0.12 0.26 0.025; ...
3 6 0.02 0.1 0.01; ...
4 5 0.2 0.4 0.04; ...
5 6 0.1 0.3 0.03];
nl = L(:,1);
nr = L(:,2);
x = L(:,4);
n = numel(x);
Nb = 6;
mat = zeros(Nb,Nb);
n = numel(x);
for i = 1:Nb
for j = 1:Nb
logic = zeros(n,1);
if i==j
for k = 1:n
logic(k) = nl(k)==i || nr(k)==i;
end
else
for k = 1:n
logic(k) = (nl(k)==i && nr(k) ==j) || (nl(k)==j && nr(k)==i);
end
end
mat(i,j) = sum(x(logic==1));
end
end
mat
end
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更多回答（1 个）

Cris LaPierre
Cris LaPierre 2022-1-8
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Cris LaPierre
Cris LaPierre 2022-1-8
That's not really how Answers works.
arian hoseini
arian hoseini 2022-1-8
x = zeros(Nb);
for i=1:Nb
for j=1:Nb
rowsToSum = L(:,1) == i & L(:,2) == j;
x(i,j) = sum(L(rowsToSum, 4));
end
end
disp(x)
i dont expect you to write the whole code for me so help me with this...i tried the top code but i get this
0 0.2000 0 0.2000 0.3000 0
0 0 0.2500 0.1000 0.3000 0.2000
0 0 0 0 0.2600 0.1000
0 0 0 0 0.4000 0
0 0 0 0 0 0.3000
0 0 0 0 0 0
for x11 i added this % x(i) = sum(L(rowsToSum, 4));
but still not working and as you see x21 should be like x12 but...the others are like this too

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