Merging row elements into single numbers

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Aleem Andrew
Aleem Andrew 2021-10-31
编辑： Chris 2021-10-31
If you have the 3*3 matrix
C = [3 4 5
6 7 9
1 5 8]
and you want to change it to the 3*1 matrix
C = [345
679
158]
so that you can for example sort it in descending order of the rows, how would you do this? Thank you.

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Chris
Chris 2021-10-31
编辑：Chris 2021-10-31
Ran in:
Edit: Use Star Strider's answer. It's faster.
C = [3 4 5
6 7 9
1 5 8]
C = 3×3
3 4 5 6 7 9 1 5 8
C = double(string(C).join(''))
C = 3×1
345 679 158
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Star Strider
Star Strider 2021-10-31
Ran in:
Another approach —
C = [3 4 5
6 7 9
1 5 8]
C = 3×3
3 4 5 6 7 9 1 5 8
C*10.^[2;1;0]
ans = 3×1
345 679 158
Just thought I’d add that for fun!
.
Chris
Chris 2021-10-31
Interesting. This was probably the most obvious method before strings? Easily generalized for an array of single-digit integers:
C*10.^[size(C,2)-1:-1:0]'

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