Logical Manipulation of Vector

I require a logical vector with 'a' number of rows =1 and followed by 'b' rows =0. How can I create this without if statements?

I know a and b.

[Paulo Silva]

not easy to understand, please provide one simple example, rows=0 is something like this: []

[Oleg Komarov]

He intended b rows of logical zeros.

[Paulo Silva]

thanks Oleg :) now I understand.

Answer 1

[Oleg Komarov]

a  = 10;
b  = 20;
lg = [true (a,1)
      false(b,1)];

Answer 2

[Daniel Shub]

[true(a, 1); false(b, 1)]

Answer 3

[Walter Roberson]

Something like,

kron([true;false],[a;b])

Unfortunately I cannot reach my server today to test this.

[Oleg Komarov]

It could have been the most elegant, although with some overhead but the result is:

ans =

10

15

0

0

[Walter Roberson]

I usually get kron() wrong the first few times... :(