Change Array Name In Each Loop

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Matthew 2017-10-9

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评论： Matthew 2017-10-9

I'm writing a For loop and want to create an array each loop, with the name changed according to the loop counter; e.g., Coll1, Coll2, Coll3, etc. Before folks slaughter me for asking...I've already read on here where folks have asked the question and "experts" recoil sharply against them saying it's a very bad newbie idea. Instead they should use the same array name but use indexing. I get that. But in this case I don't think I can do that because in each iteration of the loop, the newly created array has different dimensions each time. So I don't want the largest one creating a slew of zero cells in the smaller ones just for the sake of using a single array name. Any tips on how I can do this?

Thanks in advance, M Ridzon

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per isakson 2017-10-9

编辑：per isakson 2017-10-9

Possibilities

Assign "newly created array has different dimensions each time" to a new cell in a cell array
Assign each array to a new field in a structure. Better alternative if you have descriptive names for the arrays. Its easier to remember good names than numbers. Your code will be easier to read.

If you present good reasons for not using one of these two, I will answer questions on eval.

Matthew 2017-10-9

#1 sounds like a great idea. I hadn't thought of that. Thanks!

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Answer 1

Steven Lord 2017-10-9

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As per suggested, use a cell array.

C = cell(1, 10);
for n = 1:10
  C{n} = rand(n); % size(C{n}) is [n n]
end

Each cell in C has a different sized matrix.

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Matthew 2017-10-9

I didn't think of this. Great idea! Thanks!

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Answer 2

Image Analyst 2017-10-9

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So? Simply have 3 for loops and create a new array in each one. What's the problem?

for k = 1 : whatever1
    Coll1(k) = whatever2;
end
for k = 1 : whatever3
    Coll2(k) = whatever4;
end
for k = 1 : whatever5
    Coll3(k) = whatever6;
end

There's absolutely nothing wrong with that - no shame. Just go ahead and do it.

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Matthew 2017-10-9

Thanks, but this won't work. I do not know beforehand how many times FOR will run; i.e., the ending iteration changes. Therefore, Coll<end#> is unknown.

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