Why is there no plot on my figure?

I am trying to produce a graph of cloud height against albedo. A figure appears but no plot and I can't work out why. Thank you.

%number of droplets
N= 1120e6;
%cloud height
h= [0:1:1000];
%asymmetry parameter
g=0.858;

figure
semilogx(h,a(t(N,r(N),h),g))


function albedo = a(t,g)
% returns the cloud albedo from the measure of optical depth and asymmetry
	albedo = ((1-g)*t)/(2+(1-g)*t); 
end

function radius = r(n)
%returns the effective radius of the cloud droplets given the water content 
% and droplet number
    radius= ((3e-4*3)/(1000*4*n*pi))^(1/3);
end

function optical_depth= t(n,r,h)
%returns the optical depth of a cloud from the assumptions in Twomey 1977
    optical_depth= 2*pi*n*r^2*h;
end

Answer 1

[KSSV]

YOu are generating only a point data with the functions.....So you have to use a marker.

Try:

semilogx(h,a(t(N,r(N),h),g),'*r')

Answer 2

[madhan ravi]

albedo = ((1-g)*t)./(2+(1-g)*t); 
               %  ^------ missed it   

[EmHat]

This worked! Why is the dot necessary?

[madhan ravi]

Reason: Since t is a vector each element is divided by each element.

It's called element-wise operation see https://www.mathworks.com/help/matlab/matlab_prog/array-vs-matrix-operations.html - for better learning and understanding.

[EmHat]

Amazing! Thank you!