1x100 vector of all -1

I can't find how to create a vector with dimensions 1x100 where all the values should be -1... i know you can use "zeroes" and "ones" but how do I do this for -1? I also need to make one for the value 2.00049. Thanks!

[Tushar Chauhaan]

ok

Answer 1

[Jan]

x = -ones(1, 100);  % Faster than -1*ones(1, 100);

Inside repmat this happens:

a = -1;
x = a(ones(1, 100));

If x does not exist before or is not larger than the wanted result, this works also:

x(1:100) = -1;

But I recommend not to use this, because it depends on the history:

x = rand(11, 11);
...
x(1:100) = -1   % Still a [11 x 11] matrix!

Answer 2

[Wayne King]

x = -1*ones(1,100);
y = 2.00049*ones(1,100);

Answer 3

[Walter Roberson]

Alternative:

x = repmat(-1, 1, 100);
y = repmat(2.00049, 1, 100);