string join does not work for char arrays?
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I have a column list of numbers like the below
M = [2; 3; 5; 7; 16];
What I want is to create a string array like this
"2, 3, 5, 7, 16"
Why can't I use the below to get what I want? What is the correct way to do this?
b = join(num2str(M), ', ')
Here is the error:
"First argument must be a string array, character vector, or cell array of character vectors."
采纳的回答
Star Strider
2020-8-28
One approach:
M = [2; 3; 5; 7; 16];
M2Str = sprintf("%d, ",M(1:end-1)) + string(M(end))
producing:
M2Str =
"2, 3, 5, 7, 16"
.
更多回答（3 个）
Walter Roberson
2020-8-28
strjoin(string(M),', ')
or
strjoin(cellstr(num2str(M)),', ')
You could also consider
num2str(M.', '%g, ')
but that will leave an extra trailing comma
Steven Lord
2020-8-28
>> M = [2; 3; 5; 7; 16];
>> join(string(M), ", ")
ans =
"2, 3, 5, 7, 16"
num2str on M makes a char matrix which is not a "string array, character vector, or cell array of character vectors" and so is not a valid input to join. [Technically the error message should probably state 'character row vector', actually.]
Jeremy Perez
2020-8-28
编辑：Jeremy Perez
2020-8-28
Hi Leon,
Type:
help num2str
> num2str: Convert numbers to character representation.
You're not using strings but character arrays, which are different datatypes in MATLAB.
Try not to use character arrays as much as possible when you mean to use strings.
You can use:
join(string(M), ', ')
strjoin(string(M), ', ')
You can also test this:
sprintf('%d, ', M)
It'll add a comma at the end of your string that you can remove but it's a very useful function.
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