How can I use a function on a series of values?

So I've got a function y=f(x), where y=roots([1 0 x]).

I have a matrix n, which is:

    -1     0     0
    -2     0     0
    -3     0     0
    -4     0     0
    -5     0     0
    -6     0     0
    -7     0     0
    -8     0     0
    -9     0     0
   -10     0     0

I'm trying to have columns 2 and 3 be the solutions to the function.

Here's what I tried:

   >> n(:,2:3)=f(n(:,1))

It keeps saying 'error using horzcat'.

But if I do it manually, one by one, it works, for example:

   >> n(1,2:3)=f(n(1,1))

This would make row 1 of n (-1, -1, 1), which is correct.

How can I make it work for all of the rows at once?

Answer 1

[David Barry]

a = arrayfun(f, n(:,1), 'UniformOutput', false);
n(:,2:3) = [a{:}]';

Answer 2

[Walter Roberson]

You cannot. roots() only works with one row at a time.

However, you are working with a simple quadratic so you can easily construct the quadratic solution formula and vectorize that. A moment of thought shows that the solutions will be +/- sqrt(-x)