@dharr I want to suppress the warning in the title. I use 

interface(warnlevel = 0)

but I still get the warning messages. How can I suppress them?

@dharr Thank you!

@acer Thank you!

@Preben Alsholm Thank you but this doesn't answer my question. How do I declare the variable j in

f≔x↦seq(x,j=1..5)

?