How to compare in matlab
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Hi,
I have an array with 2*100 size. i want to check that a variable k with the 1st row of the array that k is equal or not to any value in the 1st row.
A=[3 4 6 3 5 4 2 56 7 7; 56 34 2 4 6 7 7 78];
variable k=3;
so i want to check k with A(1,1);A(1,2);A(1,3);......;A(1,n)
回答（5 个）
Vieniava
2011-2-10
Try this:
TestA=( A(1,:) == k);
TestA is a logic vector or this
TestVec=find( A(1,:) == k);
TestVec - is a vector containg positions of matched values
2 个评论
Sukumar Palo
2011-2-10
Vieniava
2011-2-10
use TestVec - TestVec would consist of indices of matched values ( A(1, TestVec) = k ).
Walter Roberson
2011-2-13
ismember(k, TestA(1,:))
Andreas Goser
2011-2-10
I suggest comparing the difference of A in k with a very small number:
f=abs(k-A(1,:))<2*eps
This avoids a couple of numerical surprises...
1 个评论
Jan
2011-2-13
What about "2 * eps(k)" to consider k'th magnitude?
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