About matrix: how to make matrix binary (0 and 1)

JRC
2012 12 17
1 个回答
更新时间：2021 8 15
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I need write the matrix (0 0 0 0 0), (1 0 0 0 0), (1 1 0 0 0), (1 1 1 0 0),..., (1 1 1 1 1) with 32 possibilities of zero and one using the matlab, and don´t hand.
Thanks.

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回答（1 个）

Matt Fig
Matt Fig 2012-12-17
编辑：Matt Fig 2012-12-17

0 个投票

S = dec2bin((1:32).') % If a string is o.k.
N = S - '0' % If you need a numeric matrix.

9 个评论
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John Petersen
John Petersen 2012-12-17
How does the N=S-'0' work? I see that it does, very clever, but why?
JRC
JRC 2012-12-17
Thanks Matt Fig...
And it´s possible to do the matrix (-1 -1 -1 -1 -1), (-1 -1 -1 -1 1), (-1 -1 -1 1 1), (-1 -1 1 1 1),..., (1 1 1 1 1) with 32 possibilities of one and one minus using the matlab, and don´t hand.
José-Luis
José-Luis 2012-12-17
编辑：José-Luis 2012-12-17
@JRC: Add:
N(N==0) = -1;
Please accept an answer if it helps you.
Matt Fig
Matt Fig 2012-12-17
编辑：Matt Fig 2012-12-17
John, MATLAB converts both strings to doubles then subtracts. It is the same as doing:
S - 48
Image Analyst
Image Analyst 2012-12-17
编辑：Image Analyst 2012-12-17
You can also cast to logical if you want a boolean type of variable:
logicalVariable = logical(doubleVariable);
Logical variables are useful in indexing, especially in image processing. In image processing a "binary" variable is usually assumed to be of logical type ("class").
Walter Roberson
Walter Roberson 2021-8-15
Ran in:
Ran in:
S = (dec2bin((1:32)) - '0') * 2 - 1
S = 32×6
-1 -1 -1 -1 -1 1 -1 -1 -1 -1 1 -1 -1 -1 -1 -1 1 1 -1 -1 -1 1 -1 -1 -1 -1 -1 1 -1 1 -1 -1 -1 1 1 -1 -1 -1 -1 1 1 1 -1 -1 1 -1 -1 -1 -1 -1 1 -1 -1 1 -1 -1 1 -1 1 -1

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JRC
JRC
2012-12-17

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Walter Roberson
Walter Roberson
2021-8-15

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