MATLAB: Populating a matrix with user input

diagonalmatrixeasyhelpinfinite matrixmatrixnanpopulating

answer=inputdlg({'nodes'});
nodes=str2double(answer(1,1));
nodematrix=Inf(nodes);
A=1;
B=0;
answer=[];
while A < nodes 
    B = B+1;
    while B < nodes
       B = B+1;
       answer = str2double(inputdlg(['Enter resistance between ',num2str(A),' and ',num2str(B)]));
       nodematrix(A,B) = str2double(answer)
       nodematrix(B,A) = str2double(answer)
    end 
    A = A+1;
    B = 1; 
end 
disp(nodematrix)
OUTPUT: 
 Inf   NaN   NaN   NaN   NaN
   NaN   Inf   NaN   NaN   NaN
   NaN   NaN   NaN   NaN   NaN
   NaN   NaN   NaN   NaN   NaN
   NaN   NaN   NaN   NaN   Inf
I was wondering why these are showing up as NaN?? And I also am trying to fill this where it does not ask to fill the diagonal.. The diagonal should always be zero. I don't know why its asking for those values..

Best Answer

See the example:
Get the data from inputdlg;
Say any number 3, 4,5,6 ........
Then 
>> str2double(4)
ans =
   NaN
>> str2double(7)
ans =
   NaN
I have removed the str2double in answer statement, str2double convert strings to double precision values, not numeric data
answer=inputdlg({'nodes'});
nodes=str2double(answer(1,1));
nodematrix=nodes6;
A=1;
B=0;
answer=[];
while A < nodes 
    B = B+1;
    while B < nodes
       B = B+1;
       answer =inputdlg(['Enter resistance between ',num2str(A),' and ',num2str(B)]);
       nodematrix(A,B) = str2double(answer)
       nodematrix(B,A) = str2double(answer)
    end 
    A = A+1;
    B = 1; 
end
##
nodematrix =
     6     5     6     7     8     3
     5     0     6     7     8     2
     6     6     4     7     3     6
     7     7     7     8     5     0
     8     8     3     5     5     6
     3     2     6     0     6     0
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