I am trying to make a piecewise vector and have 10001 input values and should be getting 10001 output values, but am only getting one output value

I am making a piecewise vector. I have 10001 t values and want to have the corresponding 10001 position values, but for some reason when I run the script I only get one position value. Does anyone know why this is happening and what I should do to fix it?

Here is my script:

t=-5:0.001:5; %time in milliseconds (ms)
if t<=-1; %ms
    position=-t; %position in feet
elseif (t>-1)&(t<=1); %ms
    position=t.^2; %ft
else 1<t; %ms
    position=sin(t-1)/(t-1);%ft
end

Answer 1

[Walter Roberson]

t = vector
position = zeros(size(t)) 
mask = t<=-1
position(mask) = -t(mask) ;
mask = t>-1&t<=1;
position(mask) = t(mask).^2 ;

And so on