why I'm getting error " Array indices must be positive integers or logical values."

%% Atmospheric Pressure

%P=Patm(1+((B*Z)/Tatm))^(g/(R*B))

R = 287;

g = 9.81; % m/s^2

B = .0065; % K/m

Patm = 101325; % Pa

Tatm = 288.15; % K

P = 88200; % Pa

%Creating equation for atmospheric presure at height Z for solution

func_atm_pressure=@(Z) P-Patm(1+((B*Z)/Tatm))^(g/(R*B));

%Solving for Z using fzero function

fzero(func_atm_pressure, 1000)

Answer 1

[the cyclist]

You need the multiplication sign after Patm:

func_atm_pressure=@(Z) P-Patm*(1+((B*Z)/Tatm))^(g/(R*B));