Variable Conversion

Question

RDG 2011-10-23

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for i=1:10
A=zeros(100,4);
A(:,1)=randi(100,100,1)    %Course(1)
A(:,2)=randi(5,100,1)      %Day(2)
A(:,3)=randi(10,100,1)     %Timeslot(3)
A(:,4)=randi(17,100,1)     %Room(4)
chr(:,:,i)=A
end

Referring to the code snippet above, may I know if there is a way to convert chr(:,:,i) into a simple variable,say A(i) where i is the loop index)? The output has to be similar to chr(:,:,i).

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Answer 1

the cyclist 2011-10-23

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If I am correctly interpreting what it is you want to do, then I think the best way is to use "cell arrays". Here is an example that is like yours:

A = cell(10,1);
for i=1:10
    A{i}=zeros(100,4);
    A{i}(:,1)=randi(100,100,1);    %Course(1)
    A{i}(:,2)=randi(5,100,1);      %Day(2)
    A{i}(:,3)=randi(10,100,1);     %Timeslot(3)
    A{i}(:,4)=randi(17,100,1);     %Room(4)
end

Now each element of the cell array, for example A{1}, is the "simple variable" you want. It is like naming them A1, A2, etc, only better.

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RDG 2011-10-23

If I may ask further, referring to the previous code which you gave me,

X = [1 2 3 4 5 5 5 1];

uniqueX = unique(X);

countOfX = hist(X,uniqueX);

indexToRepeatedValue = (countOfX~=1);

repeatedValues = uniqueX(indexToRepeatedValue)

numberOfAppearancesOfRepeatedValues = countOfX(indexToRepeatedValue)

Now that I'm using cell array to represent my variable, how do I denote it in the form of uniqueX = unique(X)? I tried a few ways but I got some "Dimension Error" message.

P/S I read from your profile that you're a researcher? A pleasure to meet you!

the cyclist 2011-10-23

You might want to start a fresh question, rather than tucking this in the comments. More people will see it. Your question is a bit vague, but maybe this will be helpful. Think of a cell array A as a container, where each element A{i} can be operated on in the usual way. For example, uniqueX{i} = unique(X{i}) would operate exactly like that other statement did. It can be a bit tricky to get used to the notation. Specifically, A(i) refers to the cell, but A{i} refers to the CONTENTS of the cell (e.g. the array).

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