How to fix "Subscripted assignment dimension mismatch" in For loop with min/sort functions, (or other)

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Sean 2014-7-3

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https://ww2.mathworks.cn/matlabcentral/answers/140115-how-to-fix-subscripted-assignment-dimension-mismatch-in-for-loop-with-min-sort-functions-or-othe

评论： Star Strider 2014-7-7

In the following code F(:,i) is being assigned different column sizes for each iteration i. The Dmin sort was my attempt at taking the smallest 2 values (I only want 2 rows for all i in F composed of the min distance (x,y) locations in X), but for instance with [1 2], [0 1], and [1 0] in pts they are all equal distance from point i=1 in X (1,1). Is there a way with the find command (or other method) to only take 2 values for F?

 clc
  clear all
  close all
  x=[1 2 3 4 5 6 7 8 9 10];
  y=[1 2 3 4 5 6 7 8 9 10];
  X=[x y];
pts=[0 0
     3 5 
     1 2
     0 1
     1 0];
for i=1:10
D      = sqrt((x(i)-pts(:,1)).^2+(y(i)-pts(:,2)).^2);
     sort_minD   = sort(D);
     Dmin(1:2,i) = sort_minD(1:2,1);
F(:,i) = find(D<=Dmin(2,i));
end

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Answer 1

Star Strider 2014-7-3

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‘Is there a way with the find command (or other method) to only take 2 values for F?’

Yes. Change the find call to:

F(:,i) = find(D<=Dmin(2,i), 2);

Adding the ‘2’ as a second argument will return only two values from find. You can further specify whether these are the 'first' or 'last' two, depending on what you want to do. See the documentation on find for details. (This has been the behaviour of find for the last several MATLAB versions, but not always, so check the documentation for your version.)