i want all the combinations for [abc]...like abc, ab, ac, bc, a, b, c. can anyone help..Plz...

I need all combinations....of k elements with n elements choosen..where n=k, k-1, n,.....1.

[Omar Ahmed]

|AB|

[Omar Ahmed]

I want to knowe that comand

[Omar Ahmed]

haw I can to use this comand |AB| in MATLAB

[Walter Roberson]

abs(A*B)

?? Or maybe

abs(AB)
abs(A.*B)
length(A)+length(B)

Answer 1

[Jos (10584)]

Take a look at my NCHOOSE function on the File Exchange as it does exactly what you're after.

S = nchoose('abc')
% S = {'a' 'b' 'ab' 'c' 'ac' 'bc' 'abc'}

http://www.mathworks.com/matlabcentral/fileexchange/20011

[biri arun]

i executed nchoose(s) but output is kind of weird...see this >> s=nchoose([1 2 3])

s =

    [         1]
    [         2]
    [1x2 double]
    [         3]
    [1x2 double]
    [1x2 double]
    [1x3 double]

What has gone wrong....Can't fix...any correction plz????

[Jos (10584)]

Nothing is wrong … no fix or correction needed … Welcome to the world of cell arrays!

s is a cell array . Each element of s holds an single array. Since these arrays are not equally long they cannot be stored simply as rows in a rectangular matrix, unless you pad them (e.g. using PADCAT, also on the File Exchange).

To access such a single array in s you use curly brackets x = s{3} % -> x now holds [1 2]