Closest value between two vectors

2017 11 21
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更新时间：2017 11 21
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I have two vectors k and l.
k l
1 5
9 8
12 32
203 1003
… …
I want to find for each value in k, if the closest next value is in k or l (if its in k, add + 1 to a counter, if it’s l, add +1 to another counter. Any help would be imesnsly appreciated! Thanks a lot!

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KL
KL 2017-11-21
you want to compare every element in k with k and l? if so, the next element in k and the current element in l? for the above example of yours, what should be the output?
numnum
numnum 2017-11-21
Yes. compare very k element with k and l and find zhere the value closest and superior is, in k or l. The output should be for k(1)= 1, closest value > is l(1)=5. Countl=0+1 for k(2)= 9, closest value > is k(3)=12. Countk=0+1 for k(3)= 12, closest value > is l(3)=32. Countl=1+ 1 for k(4)= 203, closest value > is l(4)=1003. Countl=2+1
KL
KL 2017-11-21
I do not understand when you say ... closest value > is...
What does it mean?
...for k(2)= 9, closest value > is k(3)=12...
l(2) is 8, which is closer to 9 than 12.
and what happens to the last value of k? would you only compare it with l's last value (since there's no next element in k)?
numnum
numnum 2017-11-21
the closest value that is superior. 8 < 9 so it would be rejected
KL
KL 2017-11-21
did you read my whole comment?
numnum
numnum 2017-11-21
for the last value of k, z=we don't care about it.

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回答（1 个）

Andrei Bobrov
Andrei Bobrov 2017-11-21
编辑：Andrei Bobrov 2017-11-21

1 个投票

kl =[1 5
9 8
12 32
203 1003];
z = randi([1 1003],8,1);
[~,ii] = min(abs(kl - reshape(z,1,1,[])),[],2);
out = accumarray(ii(:),1);
for numel(K) ~= numel(L):
K = randi([-45 120],12,1);
L = randi([-15 300],18,1);
z = randi([-45 300], 8 ,1);
[~,ii] = min(abs([K(:);L(:)] - z(:)'));
adds = accumarray((ii(:) > numel(K)) + 1,1);

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numnum
numnum 2017-11-21
Thanks ! But k is a vector, and l is a seperate vector, and i want to co;pare the two together.
Image Analyst
Image Analyst 2017-11-21
Then just create kl.
kl = [k, l];
If k and l are different lengths, then please say so. Also say WHY you are wanting to do this.
numnum
numnum 2017-11-21
Yes, but i want to keep information about whether the value comes from k or l. They are of differemt lengths, i should've mentionned that. Each value in an array represents the time at which an event happened. The goal is to find out the number of events that are consequentive in k vs the number of events that happen in k then in l.

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numnum
numnum
2017-11-21

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Andrei Bobrov
Andrei Bobrov
2017-11-21

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