How to convert matrix with integer values to matrix binary values in MATLAB

Question

I'm trying to create a MATLAB script that converts an 100x100 matrix of positive integers to their unsigned binary values. Example matDec=[1,2;1,2] converted to matBin=[00000001,00000010;00000001,00000010].

I tried something like:

BinI=int2bit(I,8);

where I is the initial matrix and BinI is the matrix.

But I got an 800x100 matrix as a result, meaning that the bits of each element got split into 8 elements.

"string of bits" you say, which should have length 8 right? So it is the right size? — Ander Biguri
– Ander Biguri, Commented Oct 23, 2022 at 12:50
@AnderBiguri Yes , each values varies from 0-255 , so 8 bits is the right size.The problem is that each string is divided into 8 different elements — AlexandrosS
– AlexandrosS, Commented Oct 23, 2022 at 12:53
No, a string is a "char array", an array of individual characters. — Ander Biguri
– Ander Biguri, Commented Oct 23, 2022 at 13:13
@AnderBiguri I tried to , but all i got was a single string.I also tried this command inside a for loop , for each individual element. — AlexandrosS
– AlexandrosS, Commented Oct 23, 2022 at 13:49

John Bofarull Guix · Accepted Answer · 2022-10-24 02:35:14Z

2

Let be

A1 =
     4    -2     4   -10
     5     3   -10    -8
     5    -7    -5     7

then

A2=dec2bin(A1)
A2 =
  12×8 char array
    '00000100'
    '00000101'
    '00000101'
    '11111110'
    '00000011'
    '11111001'
    '00000100'
    '11110110'
    '11111011'
    '11110110'
    '11111000'
    '00000111'

You are right, although in the command line the result looks as if each line is just one element, the type is char so each inidividual character is an actually a single element.

A way to obtain the sought matrix with same size as the input is using command string

sz1=size(A1);
reshape(string(dec2bin(A1)),sz1)
 = 
  3×4 string array
    "00000100"    "11111110"    "00000100"    "11110110"
    "00000101"    "00000011"    "11110110"    "11111000"
    "00000101"    "11111001"    "11111011"    "00000111"

Command string was introduced in MATLAB version 2016b.

There's no command string in previous versions.

answered Oct 24, 2022 at 2:35

John Bofarull Guix

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1 Comment

Wolfie Over a year ago

You can use cellstr here instead of string in any version of MATLAB, you'll end up with a cell array of chars instead of a string array

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