The problem is
x-T
here, x is a range, so you need to broadcast your subtraction like
x .- T
as you’re trying to subtract T from every element of x, not from x itself. The error tells you this - there is no method for subtracting a Float64 number from a StepRangeLen object.
Incidentally, please make sure to quote your code by using triple backticks ``` to make it easier to read.