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How to compare in matlab

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Sukumar Palo
Sukumar Palo 2011-2-10
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)

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回答（5 个）

Vieniava
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
Sukumar Palo 2011-2-10
my array is of 201111111*2
in that how to find whether a 1 is returned or not in TestA.
Vieniava
Vieniava 2011-2-10
use TestVec - TestVec would consist of indices of matched values ( A(1, TestVec) = k ).

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Sukumar Palo
Sukumar Palo 2011-2-10
my array is of 2*201111111 in that how to find whether a 1 is returned or not in TestA.
Walter Roberson
Walter Roberson 2011-2-13
ismember(k, TestA(1,:))
Andreas Goser
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
Jan 2011-2-13
What about "2 * eps(k)" to consider k'th magnitude?

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Bo
Bo 2011-2-13
Any(A(1,:)==k)

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