Help with accessing variables outside a function
9 visualizzazioni (ultimi 30 giorni)
Mostra commenti meno recenti
I am trying to create a function with two inputs: input_data(a,b). The input 'a' will indicate the sampling rate and input 'b' indicates the value. So if it was input_data(30,400), the data will be written to a text file with the value 400 from indexes 1-30. As an example:
1 400
2 400
3 400
4 400
. 400
. 400
. 400
How do i make the function so that everytime i call the function, it appends to the previous list in the text file? I want it to continue incrementing the index values from the previous entry. Thank you.
0 Commenti
Risposta accettata
Bandar
il 2 Giu 2014
Modificato: Bandar
il 3 Giu 2014
This is my code for your question
function [] = input_data(a, b)
file = fopen('data.txt', 'a+'); % append data to an existing txt file (Note: 'a' for appending)
A = textread('data.txt');
if (isempty(A))
i = 1;
for i = i:1:a
fprintf( file, '%i %f ', i, b);
i = i + 1;
end
else
start = A( size(A,2) - 2) + 1;
for j = start:1:a+start-1
fprintf( file, ' %i %f ', j, b);
j = j + 1;
end
end
fclose(file);
end
in the main,
>> input_data(2, 400)
>> input_data(2, 400)
>> input_data(3, 300)
In the txt file
1 400.000000 2 400.000000 3 400.000000 4 400.000000 5 300.000000 6 300.000000 7 300.000000
Hope this helps.
5 Commenti
Bandar
il 5 Giu 2014
I suggest you to make another question that suits your needs. The answer is for your first question.
Più risposte (0)
Vedere anche
Categorie
Scopri di più su Matrix Indexing in Help Center e File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!