Reshaping a matrix and binding two values together

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Rupert Steinmeier
Rupert Steinmeier 2020-7-28
评论： KSSV 2020-7-28
Hello dear Matlab Community!
Since I am a total novice in Matlab I'm stuck with the following, probably easily solvable, problem.
I have a matrix in the following arrangement:
20 9
12 4
3 15
6 7
. .
. .
and so forth, the integers of each column reach from 1 to 20 and are paired with an integer from the other column. The same integers cannot be paired, so for example 14 14 would be impossible.
I want to present randomized pairings of stimuli.
So, firstly I need to rearrange my two columns to this from: 20 9 12 4 3 15 6 7...
Does anybody know how to do this?
And secondly, I want to bind every 2 integers and then shuffle them. For example, 20 and 9 are bound, 12 and 4 are bound, 3 and 15 are bound and so forth. And then shuffle them, so a new arrangement might be: 12 4 20 9 3 15...
I would very much appreciate any help!
Thanks in advance and best Regards!

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回答（1 个）

KSSV
KSSV 2020-7-28
iwant = reshape(randperm(20),10,2) ;
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Rupert Steinmeier
Rupert Steinmeier 2020-7-28
Yeah, when I do this "A = A' ; A = A(:)' ;", I have my integers listed in a 40-digit row.
So, from this:
12 20
9 4
2 17
. .
. .
to this:
12 20 9 4 2 17...
Which is exactly what I wanted!
But now, I want to bind 12 and 20 together as well as 9 and 4, 2 and 17 and so forth.
And then shuffle the row. One possible outcome would be 9 4 2 17 12 20....
Do you know, what I mean?

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