Convert a decimal number to a character vector that represents its hexadecimal value.

D = 1023;
hexStr = dec2hex(D)

hexStr = 
'3FF'

Specify the number of hexadecimal digits that dec2hex returns. If you specify more digits than are required, then dec2hex pads the output with leading zeros.

D = 1023;
hexStr = dec2hex(D,6)

hexStr = 
'0003FF'

If you specify fewer digits, then dec2hex still returns as many hexadecimal digits as required to represent the input number.

hexStr = dec2hex(D,1)

hexStr = 
'3FF'

Create a numeric array.

D = [1023 122 14];

To represent the elements of D as hexadecimal values, use the dec2hex function. Each row of hexStr corresponds to an element of D.

hexStr = dec2hex(D)

hexStr = 3x3 char array
    '3FF'
    '07A'
    '00E'

The dec2hex function returns a character array padded with leading zeros. Starting in R2016b, the compose function is recommended for converting numeric arrays to hexadecimal representations. It returns a string array whose elements do not have leading zeros. To represent the elements of D as hexadecimal values, use either the %X or %x formatting operator.

hexStr = compose("%X",D)

hexStr = 1x3 string
    "3FF"    "7A"    "E"

Starting in R2020a, the dec2hex function converts negative numbers using their two's complement binary values.

For example, these calls to dec2hex convert negative numbers.

dec2hex(-1)

ans = 
'FF'

dec2hex(-16)

ans = 
'F0'