how do I implement matlab coding which has its own function????

function [t] = statxture(I, scale)

%STATXURE Compute statistical measure of texture in an image.

%T = STATXURE (F, SCALE) computes six measure of texture from an

%image (reagion) F. Parameter SCALE is a 6-dim row vector whose

%elements multiply the 6 corresponding elements of T for scaling

%purposes. if SCALE is not provided it defaults o all 1s. the

%output T is 6-by-1 vector with the following elements:

% T(1) = average gray level

% T(2) = average contrast

% T(3) = Measure of smoothness

% T(4) = Thrid moment

% T(5) = Measure of uniformity

% T(6) = Entropy

if nargin == 1

scale(1:6) = 1;

else % make sure it's a row vector

scale = scale(:)';

end

%Obtain histogram and normalize it.

p = imhist(f);

p = p./numel(f);

L = length(p);

% Compute the three moments. we need the unnormalized ones

%from function statemoments. those are in vector mu.

[v, mu] = statmoments(p,3);

%compute the six texture measure:

average gray level.

t(1) = mu(1);

%standard deviation.

t(2) = mu(2).^0.5;

%smoothness.

%first normalized the variance to [0 1] by

%dividing it by (L-1)^2.

varn = mu(2)/(L-1)^2;

t(3) = 1 - 1/(1 + varn);

%thrid moment (normalized by (L-1)^2 also).

t(4) = mu(3)/(L-1)^2;

%uniformity.

t(5) = sum(p.^2);

%entropy.

t(6) = -sum(p.*(log2(p + eps)));

%scale the values.

t=t.*scale;