how to create n*n upper triangular matrix with conditions? (image attached)

Answer 1

[Andrei Bobrov]

n = 4;
[ii,jj] = ndgrid(1:n);
out = (ii == jj) - (ii < jj);

or

n = 4;
out = eye(n) - triu(ones(n),1);

[Uzair shaikh]

thanks for your help but if we want some random number or use "magic" then what we do? example : i want a n*n matrix of some numbers.. IS IT POSSIBLE?

[Andrei Bobrov]

What and where is possible?

[Uzair shaikh]

we take user define matrices

[Uzair shaikh]

forget it.... If we use conditional statement in this then what is the command in editor?

Answer 2

[Matei Roca]

m = input ('m=');

n= input('n=')

a=zeros(m,n);

for i=1:m

fprintf('Linia %g : ', i);

a ( i, :)= input ( ' ' ) ;

end

for i=1:m

for j=1:n

if i < j

a (i,j) = 0

end

end

end

fprintf(' Matrice superior triunghiulara ' )