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

Zahlen und Text

Konvertieren von Zahlen in Text

`string`	String array
`char`	Character array
`cellstr`	Convert to cell array of character vectors
`int2str`	Convert integers to characters
`mat2str`	Convert matrix to characters
`num2str`	Convert numbers to character array

Konvertieren von Text in Zahlen

`str2double`	Convert strings to double precision values
`str2num`	Convert character array or string to numeric array
`native2unicode`	Convert numeric bytes to Unicode character representation
`unicode2native`	Convert Unicode character representation to numeric bytes

Hexadezimale und binäre Zahlen

`base2dec`	Convert text representation of base-`n` integer to double value
`bin2dec`	Convert text representation of binary integer to double value
`dec2base`	Convert decimal integer to its base-`n` representation
`dec2bin`	Convert decimal integer to its binary representation
`dec2hex`	Convert decimal integer to its hexadecimal representation
`hex2dec`	Convert text representation of hexadecimal integer to double value
`hex2num`	Convert IEEE hexadecimal format to double-precision number
`num2hex`	Convert single- and double-precision numbers to IEEE hexadecimal format

Datum und Uhrzeit

Konvertieren von Werten in Datum und Uhrzeit

`datetime`	Arrays that represent points in time
`duration`	Lengths of time in fixed-length units
`matlab.datetime.compatibility.convertDatenum`	Convert inputs to `datetime` values in a backward-compatible way (Seit R2022a)

Konvertieren von Datum und Uhrzeit in Text

`string`	String array
`char`	Character array
`cellstr`	Convert to cell array of character vectors

Kategorie-Arrays, Tabellen und Timetables

Kategorie-Arrays

categorical Array that contains values assigned to categories

Tabellen

`table2array`	Convert table to homogeneous array
`table2cell`	Convert table to cell array
`table2struct`	Convert table to structure array
`array2table`	Convert homogeneous array to table
`cell2table`	Convert cell array to table
`struct2table`	Convert structure array to table

Timetables

`array2timetable`	Convert homogeneous array to timetable
`table2timetable`	Convert table to timetable
`timetable2table`	Convert timetable to table

Zellenarrays und Strukturen

`cell2mat`	Konvertieren eines Zellenarrays in ein gewöhnliches Array des zugrunde liegenden Datentyps
`cell2struct`	Convert cell array to structure array
`mat2cell`	Convert array to cell array whose cells contain subarrays
`num2cell`	Convert array to cell array with consistently sized cells
`struct2cell`	Convert 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.