Why find doesn't work?

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Rouyu Chen
Rouyu Chen 2023-4-10
评论： Rouyu Chen 2023-4-10
Dear experts,
I am trying to use the find to find the value satisfies the constraints:
K=[1 2 3 4 5]
K(K>=2.7 & K<3.1) % this works, matlab gives 3
Assignment_L(12,1) % this equals 2.7
Assignment_U(12,1) % this equals 3.1
K(K>=Assignment_L(12,1) & K<Assignment_U(12,1)) %% this does not work, give me empty result
I was wondering why the last line does not work and give me empty result?
Many thanks!
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Les Beckham
Les Beckham 2023-4-10
Apparently your assertions about the contents of Assignment_L(12,1) and Assignment_U(12,1) aren't true. You need to verify the contents of those arrays. See below.
K = [1 2 3 4 5]
K(K>=2.7 & K<3.1) % this works, matlab gives 3
Assignment_L(12,1) = 2.7; % this equals 2.7 << Obviously, in your real Assignment_L array, this isn't true
Assignment_U(12,1) = 3.1; % this equals 3.1 << Obviously, in your real Assignment_U array, this isn't true
K(K>=Assignment_L(12,1) & K<Assignment_U(12,1)) %% this does not work, give me empty result << yes it does
If you are still having trouble, save those arrays to a mat file and attach it to your question using the paperclip icon.
Rouyu Chen
Rouyu Chen 2023-4-10
Thank you Jon and Les Beckham! I am a beginner of matlab community and not sure how to reply comments. You are right, there is a typo in my variables that's why matlab gives empty results.

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采纳的回答

VBBV
VBBV 2023-4-10
K=[1 2 3 4 5]
K(K>=2.7 & K<3.1) % this works, matlab gives 3
Assignment_L(12,1)=2.7; % this equals 2.7
Assignment_U(12,1)=3.1; % this equals 3.1
K(K>=Assignment_L(12,1) & K<Assignment_U(12,1)) %%this does work,
  2 个评论
VBBV
VBBV 2023-4-10
编辑：VBBV 2023-4-10
This does work if you give the values to both variables as above
Rouyu Chen
Rouyu Chen 2023-4-10
Thank you so much!

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