Different outputs when using { : }

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Daniya Zafar
Daniya Zafar 2022-1-7
评论： Kevin Holly 2022-1-7
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
  1 个评论
Stephen23
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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Kevin Holly
Kevin Holly 2022-1-7
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
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
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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