How to use sortrows command in java.math.BigInteger?

Question

Ammy 2022-10-13

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1824818-how-to-use-sortrows-command-in-java-math-biginteger

回答： David Hill 2022-10-13

Let A be BigInteger array (mx2)

I want to apply sortrows on A,

but it is not compatible with it .

import java.math.BigInteger.*;

e.g

A = [2 1; 2 2; 3 5; 3 6; 8 6; 8 4];

B = sortrows(A)

But when I used sortrows on BigInteger data, then the following error occur

Error using sort

Unknown command option.

Error in sortrows>sortBackToFront (line 119)

[~,ind] = sort(A(I,abs(ck)),directions{(ck < 0) + 1},opts{:});

Error in sortrows (line 73)

I = sortBackToFront(A, col, nanflag, compareflag);

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Answer 1

David Hill 2022-10-13

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1824818-how-to-use-sortrows-command-in-java-math-biginteger#answer_1073618

在 MATLAB Online 中打开

import java.math.*
%load sample BigInteger Array (100x2)
for k=1:100
  J(k,:)=[BigInteger(repmat(num2str(randi(1e14,1)),1,3)),BigInteger(repmat(num2str(randi(1e14,1)),1,3))];
end
%have to do sort manually, any sort algorithm will work but need to use
%compareTo() for BigIntegers
c=0;
while c~=size(J,1)-1
    c=0;
    for k=1:size(J,1)-1
        if J(k,1).compareTo(J(k+1,1))==0&&J(k,2).compareTo(J(k+1,2))==1
            temp=J(k+1);
            J(k+1)=J(k);
            J(k)=temp;
        elseif J(k,1).compareTo(J(k+1,1))<1
            c=c+1;
        else
            temp=J(k+1);
            J(k+1)=J(k);
            J(k)=temp;
        end
    end
end