How to assign a value to a cell nested in another cell

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Thang Le 2014-4-23

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评论： Thang Le 2014-4-23

Hi everyone,

I have a seemingly simple problem but can't seem to figure out. I have something like this P={'Face1','Face2','Scene1','Scene2'}. What I would like to do is to assign a value to each of the element in P and still preserve the element's identity. For instance, the values could be assigned like this: Face1=4*5, Face2=23*6, etc.

However, when I do P{1,1}=4*5 then P becomes {20,'Face2','Scene1','Scene2}.This is not what I want since I've lost Face1. I'd like to keep the identity of each cell so when I call D{1,1} I'll get Face1, and when I call Face1, I'll get 20.

I hope the question is clear. Does anyone have any suggestions?

Thanks!

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Answer 1

Jan 2014-4-23

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This seems to be a magic question. What about this:

P     = {'Face1','Face2','Scene1','Scene2'}
Face1 = 4*5

Or perhaps you want to use the string dynamically. Then using dynamic field names with structs is neat:

S.(P{1,1}) = 4*5;
disp(S)
S.Face1

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Thang Le 2014-4-23

Thank you, Jan. This is what I was looking for.

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Answer 2

Image Analyst 2014-4-23

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I don't understand why you want this. Why do you? After all, the row and column are already numbers that uniquely identify every single element in your cell array . If you want just one number you could use sub2ind(). But I still don't know why .

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Thang Le 2014-4-23

My rationale for doing this is that the actual P has 72 elements. Also depending on the version of the experiment I have, the order of these elements may change from one subject to another. So I thought I could specify the order of the element with P={'Face1','Face2','Scene1' etc.} for each version. Next, I'd do the caculation later for each of the elements. And since there are 72 elements, I thought a loop might be appropriate. Thus, instead of specify Face1=4*5, Face2=etc. I could do something like this:

for i=1:length(P)

P{i,1}= whatever calculation is to be done

end

At the end, I'd like to get the mean of all the Face elements, mean of all the Scene elements.

Image Analyst 2014-4-23

Not sure I understand quite yet, but let me ask this first: Do you want P to be a 1-D array of cells, or a 2-D matrix of cells? You seem to have used it both ways.

And regarding your subject line about "a cell nested in another cell", does any of the cells in the array contain another cell ? Because to me, that's what nested means. If so, what's in the nested cell. Or do all the cells simply contain single, simple strings (character arrays)?

Have you read the FAQ on cells? http://matlab.wikia.com/wiki/FAQ#What_is_a_cell_array.3F I think it gives a good intuitive explanation of cells and cell arrays.

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