Calculation does not work, and it says "Index exceeds the number of array elements"

I am trying to calculate temperature, with an imput of "h". And based on the input it would use a certain value for a. It is not working properly and is saying "Index exceeds the number of array elements." I am also trying to make this I can call in another code, and I am not sure if this is the correct way to go about doing that

function [h, a] = Temperature(T)

prompt = 'Altitude (m) ';

h = input(prompt);

if (h <= 11000)

a = -6.5e-3;

elseif (h <= 25000)

a = 1;

elseif (h <= 47000)

a = 3e-3;

elseif (h <= 53000)

a = 1;

elseif (h <= 79000)

a = -4.5e-3;

elseif (h <= 90000)

a = 1;

elseif (h <= 110000)

a = 4e-3;

end

T = 273.15 + a(h)

Answer 1

[Cris LaPierre]

The error is caused by this code at the bottom of your function: a(h)

Your variable a only contains a single number, so there is no reason to index it using h. Try just adding a.

T = 273.15 + a