[julia-users] Getting length of step range in function.

[Ben Ward]

Hi,

You can get the length of a StepRange:

*julia> **length(2:1:9)*

*8*

But if I try to do so inside a function I get an error about not finding a 
call method:

*julia> **function myfun(width::Int, step::Int, length::Int)*

       *    clip = Int(floor(width / 2))*

       *    start = 1 + clip*

       *    stop = length - clip*

       *    range = StepRange(start, step, stop)*

       *    return length(range)*

       *end*

*myfun (generic function with 1 method)*



*julia> **myfun(3, 1, 10)*

*ERROR: MethodError: `call` has no method matching call(::Int64, 
::StepRange{Int64,Int64})*

Closest candidates are:

  BoundsError()

  BoundsError(*::Any...*)

  DivideError()

  ...

 in myfun at none:6

I don't know why this is, the range constructed with the function call 
`myfun(3,1,10` should be the same range as 2:1:9. Why is this happening?

Thanks,
Ben.