Why the other value are not getting incremented in an array?

a=[1,2,3,4]
b=[1,2,3,4]
for i=1:4
for j=1:4
if(j>i||j~=i)
c(i)=p(j-i)
end
end
end
c =11     0     0     0
c =22     0     0     0
c =33     0     0     0

Subscript indices must either be real positive integers or logicals.

Answer 1

[Guillaume]

Probably, you meant

c(i,j) = p(j-i); %or maybe c(j,i), use better variable names like row, col

Rather than having a for loop going over all values and only using the valid ones with an if, use a for loop that go over only the valid ones:

for row = 1:3 
  for col = row+1:4
     c(row, col) = p(row-col);
  end
end

Answer 2

[Thorsten]

The error is due to the if-clause

 if (j>i||j~=i)

which is equivalent to

if j~=i

which is true also if j<=i, and in this case you use an invalid index <=0 in the expression

c(i)=p(j-i)