Text in String Arrays
When you are working with text, enclose sequences of characters in double quotes. You can assign text to a variable.
t = "Hello, world";
If the text includes double quotes, use two double quotes within the definition.
q = "Something ""quoted"" and something else."
q = "Something "quoted" and something else."
q are arrays, like all MATLAB® variables. Their class or data type is
Name Size Bytes Class Attributes t 1x1 174 string
To add text to the end of a string, use the plus operator,
f = 71; c = (f-32)/1.8; tempText = "Temperature is " + c + "C"
tempText = "Temperature is 21.6667C"
Similar to numeric arrays, string arrays can have multiple elements. Use the
strlength function to find the length of each string within an array.
A = ["a","bb","ccc"; "dddd","eeeeee","fffffff"]
A = 2×3 string array "a" "bb" "ccc" "dddd" "eeeeee" "fffffff"
ans = 1 2 3 4 6 7
Data in Character Arrays
Sometimes characters represent data that does not correspond to text, such as a DNA sequence. You can store this type of data in a character array, which has data type
char. Character arrays use single quotes.
seq = 'GCTAGAATCC'; whos seq
Name Size Bytes Class Attributes seq 1x10 20 char
Each element of the array contains a single character.
ans = 'A'
Concatenate character arrays with square brackets, just as you concatenate numeric arrays.
seq2 = [seq 'ATTAGAAACC']
seq2 = 'GCTAGAATCCATTAGAAACC'
Character arrays are common in programs that were written before the introduction of string arrays. All MATLAB functions that accept
string data also accept
char data, and vice versa.