Whats the difference between the two statements

Difference between

(reshape(key,2,[])')

and

reshape(key,2,[])

Answer 1

[Cris LaPierre]

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]

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

Answer 2

[Bruno Luong]

The second creates 2-row matrix.

The first creates 2-column matrix, since it make a transpose after reshape.

[Walter Roberson]

More specifically, a conjugate transpose.