Foreword
When formatting the output with sprintf (), I found that formatSpec can be a string array created with single quotes or a string created with string ('str'). So I was wondering, what is the difference between the two, and where does each apply?
Official documents
Character arrays and string arrays provide storage for text data in MATLAB®.
A character array is a sequence of characters, just as a numeric array is a sequence of numbers. A typical use is to store short pieces of text as character vectors, such as c = 'Hello World'.
A string array is a container for pieces of text. String arrays provide a set of functions for working with text as data. Starting in R2017a, you can create strings using double quotes, such as str = "Greetings friend". To convert data to string arrays, use the string function.
Code
str=sprintf('pi = %.5f',pi); %输出类型为char
str1=sprintf(string('pi = %.5f'),pi); %输出类型为string
Output result:
%测试字符串数组
>> class(str)
ans =
char
>> str(1)
ans =
p
>> size(str)
ans =
1 12
%测试string
>> class(str1)
ans =
string
>> size(str1)
ans =
1 1
>> str1(1)
ans =
string
"pi = 3.14159"
to sum up
It can be seen from the documentation:
- A string array is equivalent to a matrix (vector) of data type char. Created with single quotes. Can be indexed.
- string is equivalent to a class. Use the string () function to create an instance object. So there are functions that can operate on strings. The size is 1 * 1.
