How can I write a function that replaces all of the multiples of eight or nine in a vector with seven, unless the multiple of eight or nine is also a multiple of seven.

How can I write a function that replaces all of the multiples of eight or nine in a vector with seven, unless the multiple of eight or nine is also a multiple of seven.

Answer 1

[Ameer Hamza]

Something like this

x = 1:1000;

mul7 = mod(x, 7)==0;
mul8 = mod(x, 8)==0;
mul9 = mod(x, 9)==0;
mask = (mul8 | mul9) & (~mul7);
x(mask) = 7;