Could anyone help me to get the sum of an array to a fixed value

Question

jaah navi 2018-10-23

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编辑： Bruno Luong 2018-10-23

A=[1 2 3 4;
 5 6 7 8]
how to get the sum of A to be fixed to a 
value of 20 such that all the values in A needs
 to be  changed according to it.

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madhan ravi 2018-10-23

Give an example of your desired output

jaah navi 2018-10-23

There is no fixed logic A=[1 2 3 4; 4 3 2 1] When I sum the above A it gives 20 the value in A needs to be changed such that the sum of A needs to be 20. the values in A can be negative,or it can be repeated more than once,twice,thrice and so on.

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Answer 1

KSSV 2018-10-23

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在 MATLAB Online 中打开

A=[1 2 3 4;
 5 6 7 8] ;
A = A(:) ;
iwant = cell([],1) ;
count = 0 ;
for i = 1:length(A)
    B = nchoosek(A,i) ;
    thesum = sum(B,2) ;
    idx = thesum==20 ;
    if any(idx)
        count = count+1 ;
        iwant{count} = B(idx,:) ;
    end
end
iwant

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jaah navi 2018-10-23

What i actually need is the sum of A should be 20 and the values in A needs to be changed according to it,but when i run the above code it gives 36.could you please help me on this.

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Answer 2

Bruno Luong 2018-10-23

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https://ww2.mathworks.cn/matlabcentral/answers/425524-could-anyone-help-me-to-get-the-sum-of-an-array-to-a-fixed-value#answer_342846

在 MATLAB Online 中打开

"There is no fixed logic"

OK that's easy then

A(:) = 0;
A(1) = 20;

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jaah navi 2018-10-23

if i use the above command i am getting value only in the first place and the rest of the place is 0. But i need to have values in places where A already has values, provided no fixed logic is that the values of A can be changed .

Kevin Chng 2018-10-23