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# cast

Cast variable to different data type

## Syntax

B = cast(A,newclass)
B = cast(A,'like',p)

## Description

B = cast(A,newclass) converts A to 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 too large to map into newclass.

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

## Examples

expand all

### Convert Numeric Data Type

Convert an int8 value to uint8.

Define a scalar 8-bit integer.

a = int8(5);

Convert a to an unsigned 8-bit integer.

b = cast(a,'uint8');
class(b)
ans =
uint8

### Match Data Type and Complex Nature of p

Define a single precision vector p that is complex valued.

p = single([1+i 2]);

Define a 2-by-3 matrix of ones.

A = ones(2,3);

Convert A to the same data type and complexity (real or complex) as p.

B = cast(A,'like',p)
B =

1.0000 + 0.0000i   1.0000 + 0.0000i   1.0000 + 0.0000i
1.0000 + 0.0000i   1.0000 + 0.0000i   1.0000 + 0.0000i

Check the class of B.

class(B)
ans =

single