accessing cell data using brace indexing,

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Tijjani Aminu Kuda 2020-1-27

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评论： Walter Roberson 2021-8-29

Hi everyone,

I am tring to access the content of multiple cell in a loop. I have used the code:

for k = 1:length(predictors)
    usg = predictors{k};
end

But it doesn't work. Instead I'm getting error that reads: Brace indexing not supported for this variable type. Could someone help please?

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Walter Roberson 2020-1-28

在 MATLAB Online 中打开

What shows up for

class(predictors)

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Answer 1

Catalytic 2020-1-28

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You need to check what predictors really is. It is not a cell array, as you believe.

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Answer 2

Image Analyst 2020-1-28

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The error is saying it's not a cell array like you think. It's something else, like a double or something. Where did it come from? Did some other function create it? If so, what?

See the FAQ for a good discussion of cell arrays. This should give you a good idea of where and when to use braces, parentheses, and brackets. Granted, it can be confusing. But I think reading the FAQ will help.

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Answer 3

Abdul Rof V 2021-8-29

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编辑：Abdul Rof V 2021-8-29

在 MATLAB Online 中打开

PI=ones(10,10);
p0=0;
for i=1:5
p{i}=PI{i}
end

anything wrong in indexing

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Walter Roberson 2021-8-29

You cannot use {} indexing with numeric arrays such as PI is assigned. {} indexing is reserved for container datatypes such as cell arrays or tables or strings.

You need () indexing for numeric datatypes.

Note: your PI is 2 dimensional, but you are using a single index for it. That does have meaning and can be valid, but please make sure it is what you want to do.

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