base2dec
Convert text representation of base-n
integer to double value
Syntax
Description
converts the base-D
= base2dec(baseStr
,n
)n
integer represented by
baseStr
to the equivalent decimal number and returns it as a
double-precision floating-point value.
If baseStr
represents an integer greater than or equal to
flintmax
, then base2dec
might not represent it
exactly as a floating-point value.
Examples
Convert Text Representing Base-12 Value
Convert a character vector that represents a base-12 value to a decimal number.
baseStr = '1B';
D = base2dec(baseStr,12)
D = 23
Return Numeric Array
Create a string array that represents multiple octal, or base-8, values.
baseStr = ["1777" "172" "16"]
baseStr = 1x3 string
"1777" "172" "16"
Convert the octal values and return a numeric array.
D = base2dec(baseStr,8)
D = 1×3
1023 122 14
Input Arguments
baseStr
— Text representing base-n
numbers
character array | cell array of character vectors | string array
Text representing base-n
numbers, specified
as a character array, cell array of character vectors, or string array.
baseStr
represents base-n
digits using numeric characters and, when n
is
greater than 10, letters. For example, if n
is
12, then baseStr
represents the numbers 9, 10, and 11 using the
characters 9
, A
, and B
, and
represents the number 12 as the character sequence 10
. Letters can be
either uppercase or lowercase.
If
baseStr
is a character array with multiple rows or a cell array of character vectors, then the output is a numeric column vector.If
baseStr
is a string array, then the output is a numeric array that has the same dimensions.
baseStr
cannot represent a negative number.
n
— Base of input representation
integer between 2 and 36
Base of input representation, specified as an integer between 2 and 36. For example,
if n
is 8, then baseStr
represents base-8
numbers.
Extended Capabilities
Thread-Based Environment
Run code in the background using MATLAB® backgroundPool
or accelerate code with Parallel Computing Toolbox™ ThreadPool
.
This function fully supports thread-based environments. For more information, see Run MATLAB Functions in Thread-Based Environment.
Version History
Introduced before R2006aR2020b: Issue warning when input values are greater than or equal to flintmax
The base2dec
function issues a warning when input values are greater than or equal to flintmax
. In previous releases, base2dec
did not issue this warning.
base2dec
now issues a warning because inputs representing
integers greater than or equal to flintmax
might not be represented
exactly as double-precision floating-point values.
To convert values greater than flintmax
exactly, consider one of
these alternatives:
In place of scalar text inputs, use hexadecimal or binary literals representing the same values. When you write a value as a literal, MATLAB® stores it as an integer that represents the value exactly. For more information, see Hexadecimal and Binary Values.
To convert hexadecimal inputs greater than
flintmax
, you can use thesscanf
function with the%lx
operator. When you use%lx
, the converted values are integers that have theuint64
data type. These integers have enough storage to represent values greater thanflintmax
exactly..
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