cast

Convert variable to different data type

Description

example

B = cast(A,newclass) converts A to the data type (class) newclass, where newclass is the name of a built-in data type compatible with A. The cast function truncates any values in A that are outside the range of newclass to the nearest endpoint.

When converting a floating-point number to an integer, the cast function rounds the number to the nearest integer. If the floating-point number has a fractional part of exactly 0.5, then it rounds away from zero to the integer with larger magnitude.

example

B = cast(A,'like',p) converts A to the same data type, sparsity, and complexity (real or complex) as the variable p. If A and p are both real, then B is also real. Otherwise, B is complex.

Examples

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Convert int8 values to uint8.

Define a vector of 8-bit integers.

a = int8([-5 5]);

Convert a to unsigned 8-bit integers. The –5 value outside the range of uint8 is truncated to 0.

b = cast(a,'uint8')
b = 1x2 uint8 row vector

0   5

Create a 1-by-3 vector of 32-bit signed integers.

A = int32([-12 34 56])
A = 1x3 int32 row vector

-12    34    56

Create a complex number of the data type double.

p = 1+2i
p = 1.0000 + 2.0000i

Convert A to the same data type and complexity as the variable p.

B = cast(A,'like',p)
B = 1×3 complex

-12.0000 + 0.0000i  34.0000 + 0.0000i  56.0000 + 0.0000i

Create a 2-by-3 matrix of zeros whose elements are 32-bit unsigned integers.

A = zeros(2,3,'uint32')
A = 2x3 uint32 matrix

0   0   0
0   0   0

Create a 2-by-2 sparse matrix of the data type double.

p = sparse(2,2,pi)
p =
(2,2)       3.1416

Convert A to the same data type and sparsity as the variable p.

B = cast(A,'like',p)
B =
All zero sparse: 2x3

Input Arguments

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Input array, specified as a scalar, vector, matrix, or multidimensional array.

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | logical | char | fi | sym
Complex Number Support: Yes

New class, specified as 'single', 'double', 'int8', 'int16', 'int32', 'int64', 'uint8', 'uint16', 'uint32', 'uint64', 'logical', 'char', 'fi', or 'sym'.

Prototype, specified as a scalar, vector, matrix, or multidimensional array.

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | logical | char | fi | sym
Complex Number Support: Yes

Compatibility Considerations

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Behavior changed in R2021b