A method to control on a certain variable n is present in a column (left or right) of a matrix

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Marco Camozzi 2020-4-28

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编辑： darova 2020-4-28

Hi,

Someone could help me find a method to check on a certain variable n is present in a column (left or right) of a matrix.

The matrix presents with these dimensions:

Edge = [1 2;
        2 3;
        3 4;
        2 6;
        3 7;
        5 6;
        6 7;
        7 8];
[i,j]=size(Edge);

Thank you so much!

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Sriram Tadavarty 2020-4-28

在 MATLAB Online 中打开

For example, if you want to find value 1. Try,

[i,j] = find(Edge == 1);

Hope this helps.

Marco Camozzi 2020-4-28

Thanks a lot for the answer, I am looking for a function that certifies me if my variable n is present in the first left column, because the left column corresponds to all the starpoints of a grid of segments

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Answer 1

Tommy 2020-4-28

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编辑：Tommy 2020-4-28

在 MATLAB Online 中打开

Possibly this?

>> any(Edge==2)
ans =
  1×2 logical array
   1   1 % 2 is present in both
>> any(Edge==1)
ans =
  1×2 logical array
   1   0  % 1 is present in first column
>> any(Edge==9)
ans =
  1×2 logical array
   0   0 % 9 is present in neither column

(edit) Then how about this?

any(Edge(:,1)==n)

For exampe,

>> any(Edge(:,1)==9)
ans =
  logical
   0

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Marco Camozzi 2020-4-28

Thanks a lot for the answer, I am looking for a function that certifies me if my variable n is present in the first left column, because the left column corresponds to all the starpoints of a grid of segments

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