Re: matlab random object

Not quite.

If you have an array A, then A(:) means the same as reshape(A,[],1)
-- that is, the values of A all considered together as a single column
vector. This is not the same as A(1:end) or A(1:length(A))
as those forms will result in a row vector if A is not a column vector.

Similarily, if C is a multidimensional cell array, C{:} means
the same as forming a comma seperated list of all the contents
of the cell column array reshape(C,[],1)

The "All elements in this dimension" meaning only applies if
at least two dimensions are given in the indexing. For example,
A(:,:) is the same shape as A, but A(:) is always a column vector.

It means the line extends, and is wrapped at that point.
When you copy into the editor, you can leave out the dots AND the
carriage return after them. It makes the code easier to read here, with
short lines.

"All elements in this dimension"
For example,

a = [1,2; 3,4];
gives you a 2x2 array or matrix,
1 2
3 4

a(1,:) gives you the first row only, or 1, 2.

a(2,:) would give you the second row, or 3, 4.

a(:,1) gives you the first column,
1
3

a(:,2) gives you the second column,
2
4

Dave

cheers for that * crying with tears*..

can i have a couple of basic question please?

I've always seen these dots ... , what are these dots mean?

and what is {:} means?

Sorry, I couldn't find them in the matlab help.

Thanks a lot.

[data, speed] = wavread(file1);
samples{1} = {data, speed};
[data, speed] = wavread(file2);
samples{2} = {data, speed};
[data, speed] = wavread(file3);
samples{3} = {data, speed};

uicontrol('Style','pushbutton','String','Play Randomly', ...
 'Units', 'normal', 'Position', [1/2 1/2 1/4 1/4], ...
 'Callback', @(src, evt) wavplay(samples{ceil(length(samples)*rand)}{:}) );

I'm so sorry, but that's not very clear...

I'm quite new in matlab, basically, I need to make sure the
file can be played randomly when i click the Play button in
the gui........

possible to do that?

"ching l":
<SNIP wants to randomize the rest of the world...

one of the solutions

% the data
    lst={
         'unique.m'
         'whos.m'
         'figure.m'
    };
% the engine
% - randomly select a file for editing...
    ix=ceil(size(lst,1)*rand);
    edit(lst{ix});

us

does rand in matlab only applicable for numbers?

What can I do if I want to randomise the files?

for examples:

wavread (file1);
wavread (file2);
wavread (file3);

wavplay rand(file); - the wavplay randomly choose from the
                      wavread

is it possible to do that?

Thanks in advance.