Matlab循环不工作 [英] Matlab Loop not working

问题描述

有人可以告诉我，为什么downRight中的r总是会达到5，当我已经说过记录它的价值，一旦downRight被赋予一个值？

  A = [5,16,18,4,9; 
 9,10,14,3,18; 
 2,7,9,11,21; 
 3,7,2,19,22; 
 4,9,10,13,8] 
 
 for r = 1：5 
 normal = strfind（A（r，:)，[7,9,11] ）; 
如果isempty（正常）== 0; 
 rowOfFirstNum = r; 
 columnOfFirstNum = normal; 
 end 
 end 
 for diags = -5：5 
 downRight = strfind（diag（A，diags）'，[10,9,19]）; 
 ifempty（downRight）== 0; 
 rowOfFirstNum = downRight（1）+ max（-diags，0）; 
 columnOfFirstNum = downRight（1）+ max（diags，0）; 
 end 
 downLeft = strfind（diag（rot90（A），diags）'，[11,2,9]）; 
如果isempty（downLeft）== 0; 
 rowOfFirstNum = downLeft（1）+ max（-diags，0）; 
 columnOfFirstNum = downLeft（1）+ max（diags，0）; 
 end 
 end 
  

r对于downRight中的cOfFirstNum，但它总是5，也就是说for循环已经达到了最终值，然后它的值已经被赋值给cOfFirstNum，为什么这样呢？

解决方案

基本上，你的错误是嵌套两个循环，内部循环检查对角线，并与检查行的外部循环无关：

  A = [5,16,18,4,9; 
 9,10,14,3,18; 
 2,7,9,11,21; 
 3,7,2,19,22; 
 4,9,10,13,8] 
 
 for r = 1：5 
 normal = strfind（A（r，:)，[7,9,11] ）; 
如果isempty（正常）== 0; 
 rowOfFirstNum = r; 
 columnOfFirstNum = normal; 
 end 
 end 
 for diags = -5：5 
 downRight = strfind（diag（A，diags）'，[10,9,19]）; 
 ifempty（downRight）== 0; 
 rowOfFirstNum = downRight（1）+ max（-diags，0）; 
 columnOfFirstNum = downRight（1）+ max（diags，0）; 
 end 
 end 
  

请仔细检查 rowOfFirstNum 和 columnOfFirstNum ，如果我的解决方案是正确的，则不能保证。

Can someone please tell me why r in downRight is always going up to 5 when I have said to record it's value as soon as downRight is given a value?

A = [5,16,18,4,9;
9,10,14,3,18;
2,7,9,11,21;
3,7,2,19,22;
4,9,10,13,8]

for r = 1:5
   normal = strfind(A(r,:), [7,9,11]);
    if isempty(normal) == 0;
        rowOfFirstNum = r;
        columnOfFirstNum = normal;
    end
end
for diags = -5:5
    downRight = strfind(diag(A,diags)', [10,9,19]);
    if isempty(downRight) == 0;
        rowOfFirstNum = downRight(1)+max(-diags,0);
        columnOfFirstNum = downRight(1)+max(diags,0);
    end
    downLeft = strfind(diag(rot90(A),diags)', [11,2,9]);
    if isempty(downLeft) == 0;
        rowOfFirstNum = downLeft(1)+max(-diags,0);
        columnOfFirstNum = downLeft(1)+max(diags,0);
    end
end

r should be 2 not 5 for cOfFirstNum in downRight, but it is always 5 i.e. the for loop has reached the end before it's value has been assigned to cOfFirstNum, why is this?

解决方案

Basically, your error was to nest both loops, the inner loop checks for diagonals and has nothing to do with the outer loop which checks for rows:

A = [5,16,18,4,9;
    9,10,14,3,18;
    2,7,9,11,21;
    3,7,2,19,22;
    4,9,10,13,8]

for r = 1:5
    normal = strfind(A(r,:), [7,9,11]);
    if isempty(normal) == 0;
        rowOfFirstNum = r;
        columnOfFirstNum = normal;
    end
end
for diags = -5:5
    downRight = strfind(diag(A,diags)', [10,9,19]);
    if isempty(downRight) == 0;
        rowOfFirstNum = downRight(1)+max(-diags,0);
        columnOfFirstNum = downRight(1)+max(diags,0);
    end
end

Please double-check rowOfFirstNum and columnOfFirstNum, not shure if my solution is correct.

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