Help me generating this series of number.

White flag.

I'm trying to make a series of number like below:

1
2
5
10
20
50
100
200
500
...
...
...
1000000000
2000000000
5000000000

but i need a for-end command first

for i=1:20

because i want to use that "20" in other procedure. And the generated numbers willl also be input in another procedure which requires them to be real positive integer.

could you help me?

Answer 1

[Andrei Bobrov]

without loop for

reshape(cumprod([1 2 5;10*ones(9,3)])',[],1);

with loop for

P = zeros(30,1);
for ii = 1:20
    if rem(ii,2) == 0, 
        P(3*(ii/2)-2+(0:2)) = [1;2;5]*10^(ii/2-1);
    end
end

[Oleg Komarov]

Slightly faster alternatives:

reshape(bsxfun(@times,[1; 2; 5], 10.^(0:9)),[],1);

reshape([1; 2; 5] * 10.^(0:9),[],1);

[Albaihaqi Albaihaqi]

May I ask?

why do you use

P(3*(ii/2)-2+(0:2))= ...

instead of

P(ii)= ...

?

[Andrei Bobrov]

Because, it is necessary to fulfill your two conditions: length (P) = 30, i = 1:20

Answer 2

[Albaihaqi Albaihaqi]

Thanks dude for a lot of help... I really need this...

Could I ask you for another problem I might have in the future? Thanks