Can anyone tell me what is wrong in this code?

% success trial for small matrix

clc
clear all
close all

% Read matrix
X=pascal(3);
disp(X);
[r c]=size(X);
i=1;
%while i==c
for j=1:c
    z=[X(i,j);X(i+1,j);X(i+2,j)];
    disp(z);
end
i=i+1;
%end
breaks=[0 4 8 12];
pp=mkpp(breaks,X);
%ppn=vertcat(pp);
ppn=cell2mat(struct2cell(pp));
a=polyvalm(X,pp);

Answer 1

[KSSV]

coefs = pp.coefs ;
breaks = pp.breaks ; 
peices = pp.pieces ; 
order = pp.order ; 
dim = pp.dim ;

[Avinash Bhatt]

After this code execution I am using polyval() to calculate the piecewise polynomial using

clc
clear all
close all

% Read matrix
X=pascal(3);
disp(X);
[r c]=size(X);
i=1;
while i ~= 4
for j=1:c
    z=X(i,j);
    disp(z);
end
i=i+1;
end
breaks=[0 4 8 12];
pp=mkpp(breaks,X);
coefs = pp.coefs ;
breaks = pp.breaks ; 
peices = pp.pieces ; 
order = pp.order ; 
dim = pp.dim ;
%ppn=vertcat(pp);
%ppn=cell2mat(struct2cell(pp));
a=polyval(pp,4);
disp(pp);

Code not working. Please tell me what to do.