Whats the difference between the two statements

3 views (last 30 days)
Kaavya N on 13 Dec 2020
Commented: Walter Roberson on 13 Dec 2020
Difference between
(reshape(key,2,[])')
and
reshape(key,2,[])

Cris LaPierre on 13 Dec 2020
Explained here (with an example).
"Specify [] for the first dimension to let reshape automatically calculate the appropriate number of rows."
If you specify [] in the second dimention, it will automatically determine the appropriate number of columns for the specified number of rows.
Cris LaPierre on 13 Dec 2020
Ah, missed the transpose (the apostrophe) after the first one. That transposes the results of reshape. It's probably just easiest to test it and see:
key = magic(4);
reshape(key,2,[])'
ans = 8×2
16 5 9 4 2 11 7 14 3 10 6 15 13 8 12 1
reshape(key,2,[])
ans = 2×8
16 9 2 7 3 6 13 12 5 4 11 14 10 15 8 1
Another way is to just swap the 2 and the [].
reshape(key,[],2)
ans = 8×2
16 3 5 10 9 6 4 15 2 13 11 8 7 12 14 1

Bruno Luong on 13 Dec 2020
The second creates 2-row matrix.
The first creates 2-column matrix, since it make a transpose after reshape.
Walter Roberson on 13 Dec 2020
More specifically, a conjugate transpose.

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