matlab matrix from array

Question

I have large array. Now I need a matrix with 8 elements in every row. My array looks like this:

    A= Columns 1 through 18

0    0    0    0    0    0    0    0    0    0    1    1    0    1    1    1    0    0

Columns 19 through 36

0    0    0    0    0    0    0    0    0    1    0    0    0    0    1    1    0    0

and so on. How I can get [nx8] matrix? For example:

    B=[0    0    0    0    0    0    0    0
       0    0    1    1    0    1    1    1
       0    0    0    0    0    0    0    0
       0    0    0    1    0    0    0    0]

I've tried reshape, but it didn't work correctly. I get one 1 where shouldn't be.

    B=reshape(A,[],8)

8*4 = 32, not 36. The sizes aren't compatible. You can do reshape(A,[4 9]) though — Patrick
– Patrick, Commented Jan 2, 2014 at 22:36
@Patrick I'm assuming that "and so on" means it end on a multiple of 8. — chappjc
– chappjc, Commented Jan 3, 2014 at 1:16

Luis Mendo · Accepted Answer · 2014-01-03 01:48:11Z

6

You almost have it. The problem is that Matlab fills the matrix column-wise, whereas you seem to want it filled row-rise. So create an 8-row matrix and then transpose:

reshape(A,8,[]).'

edited Jan 3, 2014 at 1:48

answered Jan 2, 2014 at 22:40

Luis Mendo

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Alyafey · Accepted Answer · 2014-01-02 22:49:05Z

4

What about vec2mat vec2mat

 vec2mat(A,8)

answered Jan 2, 2014 at 22:49

Alyafey

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4 Comments

chappjc Over a year ago

Nice and simple! Why the f___ didn't I know about this function?

Robert Seifert Over a year ago

@chappjc: well, it's part of a not so common toolbox. So actually not a very general solution.

chappjc Over a year ago

@thewaywewalk That's why. I've never used or seen the communications system toolbox.

Luis Mendo Over a year ago

@chappjc That toolbox also has the very interesting (and quite new to me also) de2bi and bi2de, which are like dec2bin and bin2dec but using numeric vectors instead of strings

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