Different outputs when using { : }

Question

Daniya Zafar 2022-1-7

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1624580-different-outputs-when-using

评论： Kevin Holly 2022-1-7

采纳的回答： Kevin Holly

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Hi,

I am new to MATLAB and have a very basic question.

Say I have a 2x2 string:

>> str = ["Jan" "Feb"; "Mar" "Apr"]
str = 
  2×2 string array
    "Jan"    "Feb"
    "Mar"    "Apr"
    

Why are the following two different?

str{:};
A = str{:};

Thanks in advance

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Stephen23 2022-1-7

编辑：Stephen23 2022-1-7

"Why are the following two different?"

Because in one case you allocate to a variable, and in other you don't.

As an aside, using curly-braces on a string array creates a comma-separated list:

https://www.mathworks.com/help/matlab/matlab_prog/comma-separated-lists.html

Note that the comma-separated list constitutes the content of the container array, i.e. character vectors and not string scalars.

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Answer 1

Kevin Holly 2022-1-7

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https://ww2.mathworks.cn/matlabcentral/answers/1624580-different-outputs-when-using#answer_870400

编辑：Kevin Holly 2022-1-7

When you used the braces the way you did, it turned the string array into a character array.

I would look at the following:

Text in String and Character Arrays

What is a Cell Array?

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Stephen23 2022-1-7

编辑：Stephen23 2022-1-7

@Kevin Holly: so string arrays are really just cell arrays of character vectors?

Otherwise what is the relevance of the page "What is a Cell Array?" ?

Kevin Holly 2022-1-7

@Stephen Cell arrays can also include numeric values and other arrays. When I first mentioned Daniya's use of braces caused the string array to become a character array, I didn't want Daniya to get confused and think the use of braces will always make a character array. For instance if you place braces around the variable, it creates a cell array. Also, it is good to know the differences. Then I decided to make the above comment to make things clear.

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