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comparing floating point numbers

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Abhinav Srivastava
Abhinav Srivastava 2018-4-10
评论： Guillaume 2018-4-10
Dear all,
I have two arrays A and B consisting of floating point numbers. The size of array A is [104,1] and B is [641,1]. I want to compare each element of A with every element of B.
[A]=[0
2.527947992282320e-04
1.809924379782077e-04
....
]
[B]=[0
0.005
0.010
0.015
.....
]
Kindly help me.
Thanks in advance.
  1 个评论
Image Analyst
Image Analyst 2018-4-10
What does "compare" mean to you? Do you want to check for "equality"? Do you want to know which is greater or lesser? Do you want to know the distance (difference) between corresponding (or all) elements from each other? Please define "compare".
See the FAQ for info that will help you: http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F

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回答（3 个）

KSSV
KSSV 2018-4-10
Read about ismemebrtol
A Mackie
A Mackie 2018-4-10
编辑：Guillaume 2018-4-10
A-B'
will generate a 104x641 matrix where each row is a value of A minus each individual value of B.
The ' operator takes the transpose of the vector B, allowing you to use implicit expansion. This will only work with later versions of MATLAB I believe.
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Abhinav Srivastava
Abhinav Srivastava 2018-4-10
Yes I am trying to find index of k of B for which A(i) lies between B(k) and B(k+1). I think for that we need to check whether A(i) lies between B(k) and B(k+1)
Guillaume
Guillaume 2018-4-10
"Yes I am trying to find index..."
Then I have answered that...

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Guillaume
Guillaume 2018-4-10
编辑：Guillaume 2018-4-10
If you're trying to find at which k index of B the value A(i) is between B(k) and B(k+1), then:
[~, idx] = histc(A, B) %in R2013. Newer versions of matlab have much better functions for that

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