How NOT remove zeros from binary number?

Hello,

i've a problem: when i have read binary data from device and when i have store this data in differents variables, MATLAB removed automaticly the first zero from every variable if this one starts with zero. If not starts with zero, all it's ok. I think that MATLAB made this for spare memory...

How could i made for matlab preserve this first zero of each variables?

For example: 

Device gives me: 110101 and MATLAB stores 110101

but... if Device gives me: 010101 Matlab stores 10101

Remove the first zero.

Could you help me?

Thanks!

[Image Analyst]

How are you capturing these numbers into MATLAB? What's the code? Are you capturing them as numbers? Can't you tell it to store the data into character strings?

[Alberto Fernandez]

Well..

first i've receive all this values in "dec" format. Then, i convert to "binary". And is in this step when i "loose" zero.

That's the code:

    s = serial('COM5');      %crear objeto serial
    set(s, 'BaudRate', 9600)
    set(s, 'DataBits', 8)
    set(s, 'InputBufferSize', 4096);
    set(s, 'Parity','none')
    set(s, 'StopBits', 1)
    set(s, 'Terminator', 'LF/CR')
    set(s, 'FlowControl', 'none')
    %set(s, 'TimeOut', 5)
    %POLL ALMANAC DATA%

    fopen(s);

    DataToSend = ['A0';'A2';'00';'02';'92';'00';'00';'92';'B0';'B3'];
    DataDec = hex2dec(DataToSend);

    fwrite(s,DataDec,'uint8');

    DataReceive = fread(s);
    DataHex = dec2hex(DataReceive);
    fclose(s);   
    delete(s);
    clear s

    nel = numel( DataReceive);
    valorsTrama = [];
    x = 0;
    i=1;
    m=33;
    j=1;
    checksumTrama = [];
    for i=m:nel
    %     var = DataReceive(i);
        if DataReceive(i) == hex2dec(('A0'))
            fprintf('Match 1')
            if DataReceive(i+1) == hex2dec(('A2'))
                fprintf('Match 2')
                if DataReceive(i+2) == hex2dec(('00'))
                    fprintf('Match 3')
                    if DataReceive(i+3) == hex2dec(('1E'))
                        fprintf('Match 4')
                        if DataReceive(i+4) == hex2dec(('0E')) 
                            fprintf('Match 5')
                            valorsTrama(:,j) = DataReceive(i + 4: i + 4 + 29);
                            checksumTrama(:,j) = DataReceive(i + 4 + 30 : i + 4 + 30+ 1);
                            i=i+m;
                            j=j+1;
                        end
                    end
                end
            end
        end
    end

    for i=1:30
        for j=1:32
         valorsTramaHex{i,j} = dec2hex(valorsTrama(i,j));
        end
    end

    Message_ID = [];
    SV_ID = [];

    for t=1:32
        Message_ID = dec2hex(valorsTrama(1,:));
        SV_ID = valorsTrama(2,:);
    end

    valorsTramaBin_1 = dec2bin(valorsTrama(3,:));
    valorsTramaBin_2 = dec2bin(valorsTrama(4,:));
    valorsTramaBin_3 = strcat(valorsTramaBin_1,valorsTramaBin_2);
    valorsWeek = [];

    for i=1:10
        for j=1:32
            valorsWeek = strcat(valorsTramaBin_1,valorsTramaBin_3(1,9),valorsTramaBin_3(1,10));
            Week = bin2dec(valorsWeek);

        end
    end

    Status = [];
    for i=1:32
        for j=1:7
            valorsStatus = strcat('0',valorsTramaBin_2(1,2),valorsTramaBin_2(1,3),'0',valorsTramaBin_2(1,4),'0',valorsTramaBin_2(1,5),'0',valorsTramaBin_2(1,6),'0',valorsTramaBin_2(1,7));
            Status{i,1} = bin2dec(valorsStatus);
        end
    end

    valorsTramaBin_5 = dec2bin(valorsTrama(5,:));
    valorsTramaBin_6 = dec2bin(valorsTrama(6,:));
    valorsTramaBin_7 = dec2bin(valorsTrama(7,:));
    valorsTramaBin_8 = dec2bin(valorsTrama(8,:));
    valorsTramaBin_9 = dec2bin(valorsTrama(9,:));
    valorsTramaBin_10 = dec2bin(valorsTrama(10,:));
    valorsTramaBin_11 = dec2bin(valorsTrama(11,:));
    valorsTramaBin_12 = dec2bin(valorsTrama(12,:));
    valorsTramaBin_13 = dec2bin(valorsTrama(13,:));
    valorsTramaBin_14 = dec2bin(valorsTrama(14,:));
    valorsTramaBin_15 = dec2bin(valorsTrama(15,:));
    valorsTramaBin_16 = dec2bin(valorsTrama(16,:));
    valorsTramaBin_17 = dec2bin(valorsTrama(17,:));
    valorsTramaBin_18 = dec2bin(valorsTrama(18,:));
    valorsTramaBin_19 = dec2bin(valorsTrama(19,:));
    valorsTramaBin_20 = dec2bin(valorsTrama(20,:));
    valorsTramaBin_21 = dec2bin(valorsTrama(21,:));
    valorsTramaBin_22 = dec2bin(valorsTrama(22,:));
    valorsTramaBin_23 = dec2bin(valorsTrama(23,:));
    valorsTramaBin_24 = dec2bin(valorsTrama(24,:));
    valorsTramaBin_25 = dec2bin(valorsTrama(25,:));
    valorsTramaBin_26 = dec2bin(valorsTrama(26,:));
    valorsTramaBin_27 = dec2bin(valorsTrama(27,:));
    valorsTramaBin_28 = dec2bin(valorsTrama(28,:));

    Eccentricity = (bin2dec(strcat(valorsTramaBin_6, valorsTramaBin_7)))*2^(-21);

    Time_of_Applicability = (bin2dec(strcat('0',valorsTramaBin_8)))*2^(12);

    Orbital = (strcat(valorsTramaBin_9, valorsTramaBin_10));
    val = [];
    value = [];
    Orbital_Inclination = [];
    for i=1:32

    val = bin2dec(Orbital(i,:)); 
    y = sign(2^(16-1)-val)*(2^(16-1)-abs(2^(16-1)-val)); 
        if ((y == 0) && (val ~= 0)) 
            value{i} = -val; 
        else 
            value{i} = y; 
        end 
    end
    dates = (cell2mat(value));
    Orbital_Inclination = (dates*2^(-19)+0.30)*pi;

    Rate_of_Right_Ascen = [];
    RateAscen = (strcat(valorsTramaBin_11, '0',valorsTramaBin_12));
    for i=1:32

    val = bin2dec(RateAscen(i,:)); 
    y = sign(2^(16-1)-val)*(2^(16-1)-abs(2^(16-1)-val)); 
        if ((y == 0) && (val ~= 0)) 
            value{i} = -val; 
        else 
            value{i} = y; 
        end 
    end
    dates = (cell2mat(value));
    Rate_of_Right_Ascen = (((dates*2^(-38)))*pi);

    Raiz = bin2dec(strcat(valorsTramaBin_13,valorsTramaBin_14,'0000',valorsTramaBin_15,valorsTramaBin_16));
    Raiz_A = Raiz*2^(-11);

    Right_Ascen_at_Week = [];
    RightAscenWeek = (strcat(valorsTramaBin_17,valorsTramaBin_18,valorsTramaBin_19));
    for i=1:32

    val = bin2dec(RightAscenWeek(i,:)); 
    y = sign(2^(24-1)-val)*(2^(24-1)-abs(2^(24-1)-val)); 
        if ((y == 0) && (val ~= 0)) 
            value{i} = -val; 
        else 
            value{i} = y; 
        end 
    end
    dates = (cell2mat(value));
    Right_Ascen_at_Week = (((dates*2^(-23)))*pi);

    Argument_of_Perigee = [];
    omega = (strcat(valorsTramaBin_20,valorsTramaBin_21,valorsTramaBin_22));
    for i=1:32

    val = bin2dec(omega(i,:)); 
    y = sign(2^(24-1)-val)*(2^(24-1)-abs(2^(24-1)-val)); 
        if ((y == 0) && (val ~= 0)) 
            value{i} = -val; 
        else 
            value{i} = y; 
        end 
    end
    dates = (cell2mat(value));
    Argument_of_Perigee = (((dates*2^(-23)))*pi);

    Mean_Anom = [];
    Mean = (strcat(valorsTramaBin_23,valorsTramaBin_24,valorsTramaBin_25));
    for i=1:32

    val = bin2dec(Mean(i,:)); 
    y = sign(2^(24-1)-val)*(2^(24-1)-abs(2^(24-1)-val)); 
        if ((y == 0) && (val ~= 0)) 
            value{i} = -val; 
        else 
            value{i} = y; 
        end 
    end
    dates = (cell2mat(value));
    Mean_Anom = (((dates*2^(-23)))*pi);

    Af0 = [];
    fo = (strcat(valorsTramaBin_26,valorsTramaBin_27));

for example:

valorsTramaBin_15 = 1101 (32x4)

I want the four 0's before. Like 32x8 00001101

Answer 1

[Walter Roberson]

valorsTramaBin_15 = dec2bin(valorsTrama(15,:), 8);   %force 8 bits output

[Alberto Fernandez]

Ooh!! i'm really appreciate the answer!!

thanks!

Answer 2

[Arthur]

Hi!

Try convert the data to a string array before you store in a variable

Answer 3

[Walter Roberson]

How exactly is the data being received? You say it is binary. Does that mean that for the value 0, it is sending 8 bits (one character) all filled with 0 bits, and for the value 1, it is sending 8 bits with the last of them 1? Or does it mean that for the value 0, it is sending the character '0' (decimal value 48) and for the value 1, it is sending the character '1' (decimal value 49) ?

At some point you appear to be trying to store the number in decimal form. You probably shouldn't be doing that.

If the difficulty you are running into is that there are not enough digits when you display the number or send it somewhere else, and the number is in decimal form, then use

sprintf('%08d', TheNumber')