matlab version problem in dec2bin function

hai matlab experts , this is a line of code in my matlab program

reqBinData = dec2bin(newImg2);

when i am run this snippet in matlab 7.6.0 R2008a , it does not give any error.

but when i run it in matlab 7.8.0.347 R2009a it gives the following error:

??? Operands to the and && operators must be convertible to logical scalar values.

Error in ==> dec2bin at 31 if any(d < 0) any(~isfinite(d)) reqBinData = dec2bin(newImg2);

Error in ==> sampic2abb at 122

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i have attached the entire code for the reference: ------------------------------------------------------------------------------

clear;
clc;
a = imread('file.bmp'); %Reading Input File
% stochastic resonance begins here
% D=size(a);
%  M=D(1,1);
%  N=D(1,2);
%  a=double(a);
%  
% %sigma=1;
% a=quant(a,4);
% a=a+randn(M,N);
% a=uint8(a);
% stochastic resonace ends here
b = bitand(a,240); %Extracting First 4 Bits from the MSB
% The following code will push 7,6,5,4th bit to right side; since i am not okay with rotation operatoin i did like this 
for i = 1:size(a,1)
    for j = 1:size(a,2)
        if(b(i,j)== 240)
            b1(i,j)=15;
          elseif(b(i,j)== 224)
            b1(i,j)=14;
            elseif(b(i,j)== 208)
            b1(i,j)=13;
          elseif(b(i,j)== 192)
            b1(i,j)=12;
          elseif(b(i,j)== 176)
            b1(i,j)=11;
          elseif(b(i,j)== 160)
            b1(i,j)=10;
          elseif(b(i,j)== 144) 
            b1(i,j)=9;
          elseif(b(i,j)== 128)
            b1(i,j)=8;
          elseif(b(i,j)== 112)
            b1(i,j)=7;
          elseif(b(i,j)== 96)
            b1(i,j)=6;
          elseif(b(i,j)== 80)
            b1(i,j)=5;
          elseif(b(i,j)== 64)
            b1(i,j)=4;
          elseif(b(i,j)== 48)
            b1(i,j)=3;
          elseif(b(i,j)== 32)
            b1(i,j)=2;
            elseif(b(i,j)== 16)
            b1(i,j)=1;
          elseif(b(i,j)== 0)
            b1(i,j)=0;
           end
end
end

% This is gray code coversion for 7,6,5,4th bit; since i am not okay with gray code operation i did like thi
% i am aware that both these operatoins inbuilt functions are available, but still i used
% logic for that 
for i = 1:size(a,1)
    for j = 1:size(a,2)
        if(b1(i,j)== 15)
            b2(i,j)=8;
          elseif(b1(i,j)== 14)
            b2(i,j)=9;
          elseif(b1(i,j)== 13)
            b2(i,j)=11;
          elseif(b1(i,j)== 12)
            b2(i,j)=10;
          elseif(b1(i,j)== 11)
            b2(i,j)=14;
          elseif(b1(i,j)== 10)
            b2(i,j)=15;
          elseif(b1(i,j)== 9)
            b2(i,j)=13;
          elseif(b1(i,j)== 8)
            b2(i,j)=12;
          elseif(b1(i,j)== 7)
            b2(i,j)=4;
          elseif(b1(i,j)== 6)
            b2(i,j)=5;
          elseif(b1(i,j)== 5)
            b2(i,j)=7;
          elseif(b1(i,j)== 4)
            b2(i,j)=6;
          elseif(b1(i,j)== 3)
            b2(i,j)=2;
          elseif(b1(i,j)== 2)
            b2(i,j)=3;
         elseif(b1(i,j)== 1)
            b2(i,j)=1;
         elseif(b1(i,j)== 0)
            b2(i,j)=0;
         end
end
end

c = bitand(a,15);   %Extracting Last 4 Bits from the LSB
n = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0];
cntval = n;
disp('Size of the Image: ')
disp(size(a));
for i = 1:size(a,1)
    for j = 1:size(a,2)
        n(c(i,j)+1) = n(c(i,j)+1) + 1;
    end
end
maxn = max(n);
disp('0\t1\t2\t3\t4\t5\t6\t7\t8\t9\t10\t11\t12\t13\t14\15');
disp(n);
disp('Total Value of the Pixels from 0 to 7');
disp(sum(n(:)));
for i = 1:16
    if n(i) ~= maxn
        n(i) = 0;
    end
end
indn = find(n);
indn = indn - 1; %Index Stores the most frequently occuring value in the last 4 bits
disp('Maximum Value Index');
disp(indn);
  newImg2 = b2;
reqBinData = dec2bin(newImg2);
% reqBinData1 = dec2bin(b);
reqBinData = reqBinData';

singlArr = [reqBinData(4,:),reqBinData(3,:),reqBinData(2,:),reqBinData(1,:)];

dlmwrite('1.txt',singlArr, 'delimiter',' ','newline','pc');
reqMetrics = [size(a), indn];  %Metrics Required to Decode the file
disp(reqMetrics);
dlmwrite('metrics.txt',reqMetrics, 'delimiter',' ','newline','pc');

[Ryan]

What is the size/class off newImg2/b2? Does it contain negative or non-integers?

Answer 1

[Walter Roberson]

In some releases, dec2bin() does not accept arrays but does accept vectors.

In my opinion, failing on arrays is not a bug, since dec2bin is only documented to work on scalars. But Mathworks counted it as a bug and fixed it in later releases.

The workaround is to reshape the array into a vector.