Why find doesn't work?

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!

[Jon]

It looks like your variable Assignment_L and Assignment_U, don't have the values that you think. Please provide a runnable code example that demonstrates your problem for further assistance

[Les Beckham]

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]

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.

Answer 1

[VBBV]

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,

[VBBV]

This does work if you give the values to both variables as above

[Rouyu Chen]

Thank you so much!