Determine amount of items in Dataset

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Cory Dinkle 2022-2-18

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https://ww2.mathworks.cn/matlabcentral/answers/1653145-determine-amount-of-items-in-dataset

回答： Cory Dinkle 2022-4-21

Hello, I am trying to write a simple script that removes all but the final "item" in a Dataset. Not sure if this would be called an element, so it's "item" in quotes. Attached is an image of a Dataset with 9+ of these items. When I try numel or size, I simply get "1". How do I find the number of items? Thanks in advance!

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Answer 1

Cory Dinkle 2022-4-21

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https://ww2.mathworks.cn/matlabcentral/answers/1653145-determine-amount-of-items-in-dataset#answer_947490

numElements()

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Answer 2

Esha Chakraborty 2022-2-21

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Hi Cory,

I understand that you are trying to find the number of elements in a dataset array, say A, and numel(A) returns 1. To find the number of elements, n, in the dataset array A, use prod(size(A)) or numel(A,':',':').

However, the MATLAB “table” data type is recommended to work with heterogenous data instead of the “dataset” data type.

You can refer to the documentation for “numel” here.

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Cory Dinkle 2022-2-24

编辑：Cory Dinkle 2022-2-24

Hello Esha, thank you for the response. I am working with very large Simulink files and the option of using a table instead of a dataset is not available. The datasets are the "out.xFinal" of a simulation.

Also, this returns a value of "1", not the number of items within the Dataset. Please test your answer in a test case for verification first. I would recommend creating a simple simulation and looking at "out.xFinal" to see what I am referring to.

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