Populating a matrix with user input

Question

Emma Sellers 2019-11-5

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/489318-populating-a-matrix-with-user-input

评论： KALYAN ACHARJYA 2019-11-5

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..

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Answer 1

KALYAN ACHARJYA 2019-11-5

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/489318-populating-a-matrix-with-user-input#answer_399942

编辑：KALYAN ACHARJYA 2019-11-5

在 MATLAB Online 中打开

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 =
   5     6     7     8     3
   0     6     7     8     2
   6     4     7     3     6
   7     7     8     5     0
   8     3     5     5     6
   2     6     0     6     0