what it does mean?

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Nyam Jargalsaikhan
Nyam Jargalsaikhan 2021-1-12
评论： David Hill 2021-1-12
If index(1,1)==1
S1=0;
S2=1;
end

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回答（2 个）

Cris LaPierre
Cris LaPierre 2021-1-12
See MATLAB Onramp, in particular Chs 2, 5, 8, 12 & 13.
David Hill
David Hill 2021-1-12
If the matrix 'index' indexed at (1,1) equals 1, then assign S1 =0 and S2 = 0.
if index(1,1)==1
S1=0;
S2=1;
end
  2 个评论
Nyam Jargalsaikhan
Nyam Jargalsaikhan 2021-1-12
编辑：Nyam Jargalsaikhan 2021-1-12
A=[1 5 7 8 4 2 6 3];
[~, index]=sort(A);
if index(1,1)==1
S1=0;
S2=0;
end
if index(1,1)==2
S1=0;
S2=0;
end
if index(1,1)==3
S1=0;
S2=0;
end
what about this one?
David Hill
David Hill 2021-1-12
Matlab has good documentation. You should look at the sort() function.
help sort
You will see that the index array contains the index numbers for rearraigning A to sort it.
A(index)==sort(A);
The code above seems poorly written. First, index is only one dimension, so you only need to index at (1). Second, all if statements do the same thing so combining them into a single statement would be better.
A=[1 5 7 8 4 2 6 3];
[~, index]=sort(A);
if ismember(index(1),[1 2 3])
S1=0;
S2=0;
end

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