Whats the difference between the two statements

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Kaavya N
Kaavya N 2020-12-13
评论： Walter Roberson 2020-12-13
Difference between
(reshape(key,2,[])')
and
reshape(key,2,[])

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回答（2 个）

Cris LaPierre
Cris LaPierre 2020-12-13
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.
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Cris LaPierre
Cris LaPierre 2020-12-13
Ran in:
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

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Bruno Luong
Bruno Luong 2020-12-13
The second creates 2-row matrix.
The first creates 2-column matrix, since it make a transpose after reshape.

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