Not enough Input Arguments

Hello,

I am trying to solve following code:

function dCb = buffer1(pH,Cb,Cw,Kws, Ca, Ka)
phspan = [2,13];
Cb0 = [0.02; 0];
Cw = 55.5;
pKw= 14;
Kw = 10^(-pKw);
Kws = Kw/Cw;
Ca= 0.01;
Ka= 2*10^-5;

dCb = 2.303*(10^(-pH)+(Ca*Ka*10^(-pH)/(10^(-pH)+Ka)^2)+(Cw*Kws*10^(-pH)/(10^(-pH)+Kws)^2));  %HIGHLIGHT HERE

ode = @(ph, Cb) buffer1(ph, Cw, Kws, Ca, Ka)

[ph. Cb] = ode45(ode, phspan, Cb0)

But i am getting error of NOT ENOUGH INPUT ARGUMENTS(at line 11-highlighted) I don't understand what is missing. Can anybody help me plz.

Thanks in advance:

Zia

Answer 1

[Walter Roberson]

Your function handle "ode" accepts two input arguments, ignores the second of them (Cb), and calls buffer1() with 5 arguments.

function buffer1 expects 6 input arguments, not 5; in particular it expects its second input argument to be Cb, which your "ode" function handle does not pass to it.