randi size inputs not scalar issue?

I have an issue when I want a variable length I decided to give two inputs max_length and min_length. I then chose the length in the loop by choosing a random integer between these two. Although when I run it says:

*Error using randi

Size inputs must be scalar.

Could anyone tell me what the problem is.

Answer 1

[Azzi Abdelmalek]

randi(length(characters ), 1, (passwd_length-1))

passwd_length-1 should be a scalar not a vector