How to combine two functions into a single expression?

There are two functions: function xa, function a. The output of function xa is the input to function a. How do I combine the two functions so that I don't have to enter in two separate functions?

function xa= ZvalueXA(FPave, Vavenew, Vstdnew, N)
xa=(FPave-Vavenew)/((Vstdnew)/(N.^0.5));
% function xa is the output and then is imputed into function a
% FPave, Vavenew, Vstdnew, N are imputed (experimental)values from the normal distribution plots at a certain temperature. 
% FPave is the Flag Point Ave. Vavenew is the SOL Average V
% Vstdnew is the Standard Deviation of the Average V and N is the
% number of C
function a= ProbabilityPXnew(xa)
a= 1-0.5*erfc(-(xa)/sqrt(2));
% function a calculates the standard normal distribution plot using the calculate Zvalue.

... a(f(xa))

Answer 1

[Wayne King]

You can always write one function inside the other function as a "local" function

Ex:

     function [out] = outerfunction(input)

     tmp = innerfunction(input)

     function [out] = innerfunction(input)
      line 1
      line 2
     end
     end

Otherwise if you have two functions on the path, then you can compose them:

   mean(randn(100,1))

[mitra rokni]

is it possible to give it with example, i did not get that.

i need to write the integration like this integral consum( velocityy(x, distance_routeX, speed_routeX))

i need to put one function as input of another function and get the intergration .

my first function is this:

function [c] = consum(v)

load('elbilTesla'); % inserting the dataset

% initilizing the x_values and y_va;ues

x = speed_kmph;

y = consumption_Whpkm;

%curvfitting

p = polyfit(x,y,2);

c = polyval(p,v);

my second fuction is this :

function [v] = velocityy(x, distance_routeX, speed_routeX)

v= NaN;

if (x<min(distance_routeX))

disp('your selected dostance is out of range ');

elseif(x> max(distance_routeX))

disp('your selected dostance is out of range ');

else

v = spline(distance_routeX, speed_routeX,x);

end

Answer 2

[per isakson]

Passing input arguments:

>> a = ProbabilityPXnew( FPave, Vavenew, Vstdnew, N );

where

    function a = ProbabilityPXnew( varargin )
        xa = ZvalueXA( varargin{:} );
        your_code
    end

    function xa = ZvalueXA( FPave, Vavenew, Vstdnew, N )
        more_code
    end