How to display two non-consecutive column vectors

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m = [2 3 4; 5 6 7; 8 9 10]
I know how to display 1:3 or 2:3,
b = m(:,1:3)
but I am having difficulties when trying to display just first and third, not to mention when there are more columns.
  8 Comments
Jone Cris
Jone Cris on 16 Sep 2021
Edited: Jone Cris on 16 Sep 2021
Does my answer appropriate with your requirement?
b = m(:,1:2:3)

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Accepted Answer

Mischa Kim
Mischa Kim on 16 Sep 2016
Use
b = m(:,[1,3])
  1 Comment
luke hodder
luke hodder on 2 Feb 2021
Thanks for the answer; it would be good if the tutorial by this point had highlighted where to use [ ] over ( ), as it's not been completely clear about it so far. (I tried many solutions including yours but used ( ) instead of [ ])

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More Answers (6)

Arvind P
Arvind P on 28 Mar 2020
Try extracting the first, third, and sixth elements of density.
density=[1.4 1.8882 3.090909 4.377 5.090 6.888 7.939 8.98989 9.1225 10.36369]'
%transposed
p=density([1 3 6],:)
p
The answer is
1.4
3.090909
6.888
this is how you extract non consequtive indices in a column
  5 Comments
Steven Agee
Steven Agee on 20 Sep 2020
Thanks for the help, I was getting pretty frustrated with this part.
This would have been nice for the tutorial to explain rather than just tell you to do it.
luke hodder
luke hodder on 2 Feb 2021
Agreed - at this point the course has not actually distinguished between the purposes of ( ) vs [ ], I tried all the combinations of the above but not using square brackets. Very frustrating.

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Khom Raj Thapa Magar
Khom Raj Thapa Magar on 10 Sep 2020
Indices can be non-consecutive numbers. Try extracting the first, third, and sixth elements of density.
Indices can be non-consecutive numbers. Try extracting the first, third, and sixth elements of density.
y = density([1 3 6],:)

KAMOOSH BABA SHAIK
KAMOOSH BABA SHAIK on 1 Apr 2021
Indices can be non-consecutive numbers. Try extracting the first, third, and sixth elements of density.
p = density([1,3,6])
for non-consecutive numbers
  1 Comment
Martin Whybrow
Martin Whybrow on 2 Apr 2021
As density is a vector, this seems to be the correct solution, it certainly worked for me.

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madhanmohan nj
madhanmohan nj on 26 May 2020
density=[1.4 1.8882 3.090909 4.377 5.090 6.888 7.939 8.98989 9.1225 10.36369]'
p = density([1,3,6], end)
p = density([1,3,6], :)
basically what is diff between line 2 & 3 ?
  1 Comment
Marianna Nido
Marianna Nido on 17 Oct 2020
I think the diff between line 2 and three is:
-in line 2 you are extracting the 1st, the 3rd and the 6th element of the last column of density
-in line 3, you are extracting the 1st, the 3rd and the 6th element of all columns in density
In this case, the result doesn't change, since density is a vector and not a matrix.
I'm not sure about this, but i think this is the diff.

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ved prakash
ved prakash on 1 Oct 2020
b = density([1,3,6],:)

Kevin Hedrick
Kevin Hedrick on 5 Jan 2021
I used:
y = density(1:2:6)
Then I did a Google search to see how everyone else solved this Further Practice question and it seems I went a whole different route.
  1 Comment
Othmane CHLAIKHY
Othmane CHLAIKHY on 10 Feb 2021
no thats wrong i think your commande will create a vector named Y and containing the first, 3th and the 5th elements and not the 6th
to resolve the probleme, you need to use this type of commande
y = density([1 3 6]);
good luck

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