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Konvertierung von Datentypen

Konvertieren zwischen numerischen Arrays, String und Character Arrays, Datum und Uhrzeit, Zellenarrays, Strukturen oder Tabellen

MATLAB® besitzt viele Funktionen, um Werte für eine Nutzung in unterschiedlichem Kontext von einem Datentyp in einen anderen zu konvertieren. Beispielsweise können Sie Zahlen in Text konvertieren und dann anhängen, um Beschriftungen oder Dateinamen grafisch darzustellen. Sie können Zahlen als hexadezimale oder binäre Werte darstellen. MATLAB liefert Funktionen für Konvertierungen zwischen numerischen Arrays, String- und Character Arrays sowie categorical, datetime und duration-Arrays. Sie können auch Konvertierungen zwischen Datentypen vornehmen, die Daten in Containern gruppieren, wie Zellenarrays, Strukturen, Tabellen und Timetables. In diesen Fällen bleiben die Datenwerte identisch, aber das Speichern und der Zugriff erfolgen in einer anderen Art von Container.

Funktionen

alle erweitern

Konvertieren von Zahlen in Text

stringString array
charCharacter array
cellstrConvert to cell array of character vectors
int2strConvert integers to characters
mat2strConvert matrix to characters
num2strConvert numbers to character array

Konvertieren von Text in Zahlen

str2doubleConvert strings to double precision values
str2numConvert character array or string to numeric array
native2unicodeConvert numeric bytes to Unicode character representation
unicode2nativeConvert Unicode character representation to numeric bytes
base2decConvert text representation of base-n integer to double value
bin2decConvert text representation of binary integer to double value
dec2baseConvert decimal integer to its base-n representation
dec2binConvert decimal integer to its binary representation
dec2hexConvert decimal integer to its hexadecimal representation
hex2decConvert text representation of hexadecimal integer to double value
hex2numConvert IEEE hexadecimal format to double-precision number
num2hexConvert single- and double-precision numbers to IEEE hexadecimal format

Konvertieren von Werten in Datum und Uhrzeit

datetimeArrays that represent points in time
durationLengths of time in fixed-length units
matlab.datetime.compatibility.convertDatenumConvert inputs to datetime values in a backward-compatible way (Seit R2022a)

Konvertieren von Datum und Uhrzeit in Text

stringString array
charCharacter array
cellstrConvert to cell array of character vectors

Kategorie-Arrays

categoricalArray that contains values assigned to categories

Tabellen

table2arrayConvert table to homogeneous array
table2cellConvert table to cell array
table2structConvert table to structure array
array2tableConvert homogeneous array to table
cell2tableConvert cell array to table
struct2tableConvert structure array to table

Timetables

array2timetableConvert homogeneous array to timetable
table2timetableConvert table to timetable
timetable2tableConvert timetable to table
cell2matKonvertieren eines Zellenarrays in ein gewöhnliches Array des zugrunde liegenden Datentyps
cell2structConvert cell array to structure array
mat2cellConvert array to cell array whose cells contain subarrays
num2cellConvert array to cell array with consistently sized cells
struct2cellConvert structure to cell array

Themen

  • Convert Text to Numeric Values

    Convert text to arrays of numeric values. Text can represent floating-point values, dates and times, and hexadecimal and binary numbers. If text represents dates and times, then you can convert the text to datetime or duration values.

  • Convert Numeric Values to Text

    Convert numeric values to text. Text can represent floating-point values, either with or without exponential notation, or hexadecimal or binary digits. Use these conversions to add numbers to text such as plot labels or titles.

  • Unicode and ASCII Values

    MATLAB stores all characters as Unicode characters. Both strings and character vectors use the same encoding. You can convert characters to their Unicode code values, and numbers to characters.

  • Hexadecimal and Binary Values

    Specify hexadecimal and binary values either as literals or as text. Hexadecimal and binary literals are stored as integers. You can convert text representing hexadecimal and binary values to numbers, and numbers to text representations.

  • Convert Between Text and datetime or duration Values

    The datetime and duration data types are the recommended data types for working with dates and times. You can convert these data types to text by using the string function, and you can convert text to these data types by using the datetime and duration functions. When you read text representing dates and times from spreadsheets and text files you can automatically convert the text to datetime or duration arrays.

  • Convert Text in Table Variables to Categorical

    This example shows how to convert a variable in a table from a cell array of character vectors to a categorical array.

  • Valid Combinations of Unlike Classes

    If you include elements of unlike classes in a matrix, MATLAB converts some elements so that all elements of the resulting matrix are of the same type. Data type conversion is done with respect to a preset precedence of classes.