MATLAB Programming Fundamentals - MathWorks

ans =

"Hello, "

Insert a substring after empty strings using the insertAfter function. Because there

are empty strings between each pair of characters, insertAfter inserts substrings

between each pair.

insertAfter(str,"","-")

ans =

"-H-e-l-l-o-,- -w-o-r-l-d-"

In general, string functions that replace, erase, extract, or insert substrings allow you to

specify empty strings as the starts and ends of the substrings to modify. When you do so,

these functions operate on the start and end of the string, and between every pair of

characters.

Test for Missing Values

You can test a string array for missing values using the ismissing function. The missing

string is the string equivalent to NaN for numeric arrays. It indicates where a string array

has missing values. The missing string displays as <missing>.

To create a missing string, convert a missing value using the string function.

str = string(missing)

str =

<missing>

You can create a string array with both empty and missing strings. Use the ismissing

function to determine which elements are strings with missing values. Note that the

empty string is not a missing string.

str(1) = "";

str(2) = "Gemini";

str(3) = string(missing)

str = 1x3 string array

"" "Gemini" <missing>

ismissing(str)

ans = 1x3 logical array

6 Characters and Strings