Problem with the function fnzeros

Hi I'm a new Matlab user and I have some difficulties with the function fnzeros. I've create a function called Temp

function y = Temp (x,m2,t2,p2,cp,Rd)
y = 1.61*m2*p2*(x/t2).^(cp/Rd)-611*.10^(7.5*(t2-273.15)/(t2-35.85));
end

but when i try to run the command

z = fnzeros (Temp)

to find the solution of the equation y=0 i have this message of error:

Error using fnbrk (line 127)
Input is of unknown (function) form.

Error in fnzeros (line 69)
if fnbrk(f,'var')>1

Can someone explain me why? Thank you very much

Answer 1

[Walter Roberson]

You need to pass a spline to fnzeros. Instead you are passing the result of executing the function Temp with no inputs. Notice that the examples in the documentation involve calling spmak()

http://www.mathworks.com/help/curvefit/fnzeros.html

[Gianluca lubelli]

so how can i modify the code to find that solution? How can i make a spline of that function? Sorry I'm really new on this software, I have a lot of things to learn :-)

Answer 2

[Gianluca lubelli]

so how can i modify the code to find that solution? How can i make a spline of that function? Sorry I'm really new on this software, I have a lot of things to learn :-)