How can variables be passed to a function

If I define a function in F.m file with the following:

function zp=F(x,z)
zp=zeros(2,1);
zp(1)=z(2);
zp(2)=a*sqrt(1+z(2)^2)+kx;

That is a function I want to evaluate by using:

[x,z]=ode45('F',[x0,xf],[z10,z20]);

I'm not sure how I can pass a and kx to that function before it is evaluated.

Answer 1

[Azzi Abdelmalek]

function zp=F(x,z,a,kx)
zp=zeros(2,1);
zp(1)=z(2);
zp(2)=a*sqrt(1+z(2)^2)+kx;

% ---------------------------------------------

[x,z]=ode45(@(x,z),F(x,z,a,kx),[x0 xf],[z10;z20]);

[Jared]

I'm not quite sure on the syntax but it appears that there is something a bit off, possibly the comma in between (x,z) and F.

[Azzi Abdelmalek]

Yes, remove a comma

[x,z]=ode45(@(x,z) F(x,z,a,kx),[x0 xf],[z10;z20]);