How to write comments defining the elements in a 2d array?

Question

catarina 2012-1-4

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/25280-how-to-write-comments-defining-the-elements-in-a-2d-array

Hello,

    I want to write text defining the elements of my matrice but can't figure out how to do it. I need to write a matrice that has element 1 if An <= Yj <= An+1 ; 0 otherwise.
I don't know how to put these instruction about the elements into the matrice. Hope I'm making sense!
    Anyone that can help?
    Thanks 
    Catarina

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Answer 1

Dr. Seis 2012-1-4

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https://ww2.mathworks.cn/matlabcentral/answers/25280-how-to-write-comments-defining-the-elements-in-a-2d-array#answer_33178

在 MATLAB Online 中打开

>> Yj = rand(3,4)
Yj =
    0.5447    0.4239    0.1753    0.2433
    0.2167    0.8710    0.1654    0.1209
    0.8463    0.2685    0.3614    0.5910
>> Zj = (Yj>=0.3).*(Yj<=0.7)
Zj =
     1     1     0     0
     0     0     0     0
     0     0     1     1

Note the ".*" used for element-by-element multiplication. Just substitute the 0.3 and 0.7 for your values associated with An and An+1.

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Dr. Seis 2012-1-5

It should work. I just showed an example of Yj (since I don't know what those values actually are), but as long as you substitute "An" and "An+1" for "0.3" and "0.7", respectively, then you should get the correct result.

Fnj = (An<=Yj).*(Yj<=(An+1))

You did want Fnj to be the same sized matrix as Yj, right?

Dr. Seis 2012-1-5

Also, you can copy my example above and paste into your Matlab command window to see how things work. For example:

A = (Yj>=0.3)

will produce a logical matrix the same size as Yj, but will have values of 1 for elements of Yj that are >= to 0.3 and values of 0 otherwise.

B = (Yj<=0.7)

will produce a logical matrix the same size as Yj, but will have values of 1 for elements of Yj that are <= 0.7 and values of 0 otherwise. By multiplying each element in A by the corresponding element in B you essentially get the intersection of A and B (i.e., where A and B both equal 1).

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