specifying an array size

clear

count=1

A =randi([1,9999],10,31)

[row,col]=size(A)

for i=1: row

for j =1:col

%%to check if this number appears and then store than index in another

%%array

if A(i,j)==4000

b=[i,j]

count = count+1;

%% I would like to have the count as the amount of rows, and two columns for i and j

b=[,count;,;]

end

end

end

Answer 1

[Chunru]

count=0;
b = [];

%A =randi([1,9999],10,31);  
A =randi([1,60],10,31);  

[row,col]=size(A);
for i=1: row
    for j =1:col
        %if A(i,j)==4000
        if A(i,j)==10
            count = count+1;
            b=[b; count i,j];
        end
    end
end

b

b = 7×3

1 3 4 2 5 21 3 5 27 4 6 2 5 7 25 6 9 6 7 9 14