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%utworzyc macierz kwadratową w wymiarze 3x3 na podstawie której wyznaczycie
%zmienne utworzyc zmienna k która jest 2wystepuje w 3wierszu 1 kolumnie.
%wyznaczoną zmienna zapisac do pliku tekstowego. nastepnie utworzyc program
%który bedzie wywoływal z dysku twardego funkcję . który po wpisaniu
%funkcji obliczającej pole koła

clc
clear
disp('program oblicza pole na podstawie zmiennej k która znajduje sie w macierzy 3x3 na miejscu(3,1) która jest odczytana z pliku ')
A=input('Podaj podaj macierz wartości macierzy 3x3:');
disp(A)
[pk]=wejsc5f(A(3,1));
pk=round(pk,4);
disp(['zmienna k wynosi ',num2str(A(3,1))])
obj=1;
fid=fopen('pliczek.txt','w');
fprintf(fid, '%fn', pk);
fclose(fid);
save wyniki.txt pk -ascii
save wyniki.mat pk -ascii
clear pk
mid2=fopen('pliczek.txt','r');
a = fscanf(mid2, '%f2n');
fclose(mid2);
disp(['pole koła wynosi ',num2str(a)])

%drugi plik
function[pk] = wejsc5f(r)
pk=pi()*r.^2;
     
 
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