How to Extract Cell Arrays contained in a cell

Hello,pls i have a cell array that contains 4 cells,(i.e. 1x1 1x16 1x32 and 1x1, each of which represent an image.)How can i extract each of this cell(as a matrix) and display as an image. Thanks

Answer 1

[Jan]

C = {{1:4, 5:20}};
D1 = C{1}{1}
D2 = C{1}{2}

Answer 2

[Image Analyst]

Use braces:

image1 = cellArray{1}; % extract image #1
image2 = cellArray{2}; % and so on.
imshow(image1, []);  % the [] is important if they are double or single.

By the way, those are some very tiny images. I mean is a 1x1 array even an image at all?

[Bashir]

The first part works, but for the imshow there is an error that input should be double, single etc but what we are having is a "cell". How do i convert from cell to double? Thanks alot

[Image Analyst]

You must have done cellArray(1) instead of cellArray{1}. The braces mean to take the CONTENTS of the cell, which is some kind of numerical array (uint8, double, whatever), Parentheses mean to take that CELL ITSELF from the array, and that will be a cell. So switch from parentheses to braces and that should fix it, unless your 1x1 or whatever is a cell or cell array itself rather than a double or integer array. It is possible to have a cell or cell array inside a cell, though I think you should avoid that if you can. Hopefully you don't have that situation.

[Bashir]

That is the exact situation i am having(cells within a cell array).pls help me out.Thanks once more.

[Image Analyst]

Why? Did you make it up that way for some reason? A good reason? I know you need to if you want to store lists of strings, but for numerical arrays ....I don't see any benefit. How did you make it up and perhaps we can tell you how to avoid that? Or else use Jan's solution. Braces, parentheses, comma between the indexes, or back-to-back braces (like Jan did) between the indexes? - you can see why cell arrays can be confusing and why you should use them only when necessary.

[Bashir]

I did not make it that way, what I have is a result of curvelet transformation performed on an image and i need to work with the output. Thanks

[Jan]

Dear Bashir, does my suggestion help you? If not, I still do not understand, what you need.