Error using fscanf ???

Question

Khoirunnisya Zawawi 2016-10-16

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/307540-error-using-fscanf

评论： Bagus Adhi 2021-6-22

Hi to all. Please help. I'm new in Matlab, so i don't really understnad why i get this error.

"Error using fscanf
Invalid file identifier. Use fopen to generate a valid file identifier. Error in gaspp (line 22)
num = fscanf(fid, '%d', [1,1]);  % Number of nodes"

i found a code related to my project so i tried it and it was running. but when i finish input then it shows an error.

this is my code

disp('==============================');
disp('Masukkan Parameter Program'); 
disp('==============================');
f_input = input('>> Nama Input File : ','s'); % Contains network info 
startNode = input('>> Node sumber : ');    % Source node 
endNode = input('>> Node tujuan : ');  % Destination node
nind = input('>> Ukuran populasi : ');  % Population size
Pc = input('>> Probabilitas crossover : '); % Crossover probability 
Pm = input('>> Probabilitas mutasi : ');    % Mutation probability 
ngener = input('>> Batas generasi : ');  % Generations limit
% -------------------------------------------------------------
% NETWORK BUILDING
% -------------------------------------------------------------
fid = fopen(f_input,'r');
*num = fscanf(fid, '%d', [1,1]);% Number of nodes* 
edges = fscanf(fid, '%d', [1,1]);% Number of edges 
source_node = zeros(1,edges);% Set of source nodes 
dest_node = zeros(1,edges);% Set of end nodes 
link_cost = zeros(1,edges);% Set of link cost 
unlink_cost = 1000;% Set of unlink cost

thanks before

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Answer 1

Walter Roberson 2016-10-16

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/307540-error-using-fscanf#answer_239240

When you are prompted for Nama Input, you need to type in the name of an existing file.

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Khoirunnisya Zawawi 2016-10-20

编辑：Walter Roberson 2016-10-21

Hi Walter. i found another error in this code, its about horzcat. can you help me about it? this is my new question https://www.mathworks.com/matlabcentral/answers/308260-how-to-solve-this-error-error-using-horzcat-dimensions-of-matrices-being-concatenated-are-not-cons

i really appreciate it if you could help, thank you so much :)

Bagus Adhi 2021-6-22

I'm sorry maybe its to late for asking about this question now. I want to ask is "is there any code that should be changed to clear the error", cause i cannot find the answer by reading all the aswer between Ms. Khoirunnisya and Mr. Walter. I really need your help, this answer will help me for my Presentation. Thank You

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