bitconcat

Concatenate bits of fi objects

Syntax

y = bitconcat(a)

y = bitconcat(a, b, ...)

Description

y = bitconcat(a) concatenates the bits of the elements of fixed-point fi input array, a.

y = bitconcat(a, b, ...) concatenates the bits of the fixed–point fi inputs.

Examples

Concatenate the Elements of a Vector

Create a fixed-point vector.

a = fi([1,2,5,7],0,4,0);
disp(bin(a))

0001   0010   0101   0111

Concatenate the bits of the elements of a.

y = bitconcat(a)

y = 
        4695

          DataTypeMode: Fixed-point: binary point scaling
            Signedness: Unsigned
            WordLength: 16
        FractionLength: 0

disp(bin(y))

0001001001010111

The word length of the output, y, equals the sum of the word lengths of each element of a.

Concatenate the Bits of Two fi Objects

Create two fixed-point numbers.

a = fi(5,0,4,0);
disp(bin(a))

0101

b = fi(10,0,4,0);
disp(bin(b))

1010

Concatenate the bits of the two inputs.

y = bitconcat(a,b)

y = 
    90

          DataTypeMode: Fixed-point: binary point scaling
            Signedness: Unsigned
            WordLength: 8
        FractionLength: 0

disp(bin(y))

01011010

The output, y, is unsigned with a word length equal to the sum of the word lengths of the two inputs, and a fraction length of 0.

Perform Element-by-Element Concatenation of Two Vectors

When a and b are both vectors of the same size, bitconcat performs element-wise concatenation of the two vectors and returns a vector.

Create two fixed-point vectors of the same size.

a = fi([1,2,5,7],0,4,0);
disp(bin(a))

0001   0010   0101   0111

b = fi([7,4,3,1],0,4,0);
disp(bin(b))

0111   0100   0011   0001

Concatenate the elements of a and b.

y = bitconcat(a,b)

y = 
    23    36    83   113

          DataTypeMode: Fixed-point: binary point scaling
            Signedness: Unsigned
            WordLength: 8
        FractionLength: 0

disp(bin(y))

00010111   00100100   01010011   01110001

The output, y, is a vector of the same length as the input vectors, and with a word length equal to the sum of the word lengths of the two input vectors.

Perform Element-by-Element Concatenation of Two Matrices

When the inputs are both matrices of the same size, bitconcat performs element-wise concatenation of the two matrices and returns a matrix of the same size.

Create two fixed-point matrices.

a = fi([1,2,5;7,4,5;3,1,12],0,4,0);
disp(bin(a))

0001   0010   0101
0111   0100   0101
0011   0001   1100

b = fi([6,1,7;7,8,1;9,7,8],0,4,0);
disp(bin(b))

0110   0001   0111
0111   1000   0001
1001   0111   1000

Perform element-by-element concatenation of the bits of a and b.

y = bitconcat(a,b)

y = 
    22    33    87
   119    72    81
    57    23   200

          DataTypeMode: Fixed-point: binary point scaling
            Signedness: Unsigned
            WordLength: 8
        FractionLength: 0

disp(bin(y))

00010110   00100001   01010111
01110111   01001000   01010001
00111001   00010111   11001000

The output, y, is a matrix with word length equal to the sum of the word lengths of a and b.

Input Arguments

a — Input array

scalar | vector | matrix | multidimensional array

Input array, specified as a scalar, vector, matrix, or multidimensional array of fixed-point fi objects. bitconcat accepts varargin number of inputs for concatenation.

Data Types: fixed-point fi

b — Input array

scalar | vector | matrix | multidimensional array

Input array, specified as a scalar, vector, matrix, or multidimensional array of fixed-point fi objects. If b is nonscalar, it must have the same dimension as the other inputs.

Data Types: fixed-point fi

Output Arguments

y — Output array

scalar | vector | matrix | multidimensional array

Output array, specified as a scalar, vector, matrix, or multidimensional array of unsigned fixed-point fi objects.

The output array has word length equal to the sum of the word lengths of the inputs and a fraction length of zero. The bit representation of the stored integer is in two's complement representation. Scaling does not affect the result type and value.

If the inputs are all scalar, then bitconcat concatenates the bits of the inputs and returns a scalar.

If the inputs are all arrays of the same size, then bitconcat performs element-wise concatenation of the bits and returns an array of the same size.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.

HDL Code Generation

Generate VHDL, Verilog and SystemVerilog code for FPGA and ASIC designs using HDL Coder™.

For VHDL^®, generates the concatenation operator: (a & b).

For Verilog^®, generates the concatenation operator: {a , b}.

Version History

Introduced in R2007b