# Error in setting a for loop
**URL:** https://discourse.julialang.org/t/error-in-setting-a-for-loop/50891
**Category:** New to Julia
**Tags:** question
**Created:** [November 28, 2020, 7:34am UTC](https://discourse.julialang.org/t/error-in-setting-a-for-loop/50891 "2020-11-28T07:34:31Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Luigi\_Marongiu](https://discourse.julialang.org/u/Luigi_Marongiu)
#### Post date: [November 28, 2020, 7:34am UTC](https://discourse.julialang.org/t/error-in-setting-a-for-loop/50891/1 "2020-11-28T07:34:31Z")
Hello,
I am setting a for loop but I am getting an error:
```julia
epsilon = 1
omega = 0.05
tau = 2.392731385751533
mu = 0.72
p = [epsilon, omega, tau, mu]
for x in [0.0:0.1:1.0e9]
println(x)
y = ε * exp( ω * (ϑ-x) + (ω/μ) * (exp( -μ * (ϑ-x) ) - 1) )
println(y)
end
0.0:0.1:1.0e9
ERROR: MethodError: no method matching -(::Float64, ::StepRangeLen{Float64,Base.TwicePrecision{Float64},Base.TwicePrecision{Float64}})
For element-wise subtraction, use broadcasting with dot syntax: scalar .- array
Closest candidates are:
-(::ChainRulesCore.DoesNotExist, ::Any) at /home/gigiux/.julia/packages/ChainRulesCore/UayCG/src/differential_arithmetic.jl:25
-(::Float64, ::Float64) at float.jl:403
-(::Float64) at float.jl:393
...
Stacktrace:
[1] top-level scope at ./none:3
```
Why is x not given as 0.0?
What is the error about?
It looks is a type of varibale error, so I checked the kind of x is generated during the executin:
```julia
for x in [0.0:0.1:1.0e9]
println(typeof(x))
y = ε * exp( ω * (ϑ-x) + (ω/μ) * (exp( -μ * (ϑ-x) ) - 1) )
push!(Y, x)
end
StepRangeLen{Float64,Base.TwicePrecision{Float64},Base.TwicePrecision{Float64}}
ERROR: MethodError: no method matching -(::Float64, ::StepRangeLen{Float64,Base.TwicePrecision{Float64},Base.TwicePrecision{Float64}})
For element-wise subtraction, use broadcasting with dot syntax: scalar .- array
Closest candidates are:
-(::ChainRulesCore.DoesNotExist, ::Any) at /home/gigiux/.julia/packages/ChainRulesCore/UayCG/src/differential_arithmetic.jl:25
-(::Float64, ::Float64) at float.jl:403
-(::Float64) at float.jl:393
...
Stacktrace:
[1] top-level scope at ./none:3
```
It looks like x is not extracted from the generator and also has a type different from the variables, since it should be of type Float64 (or even less since I don’t need so much precision after all).
I also tried to define the iterator with `linspace` but
```julia
?linspace
search: LinSolveGPUFactorize
Couldn't find linspace
Perhaps you meant isspace or isinplace
No documentation found.
Binding linspace does not exist.
```
Is there a new version of it?
Thank you
---
### Author:  [@sijo](https://discourse.julialang.org/u/sijo)
#### Post date: [November 28, 2020, 7:41am UTC](https://discourse.julialang.org/t/error-in-setting-a-for-loop/50891/2 "2020-11-28T07:41:14Z")
> [@Luigi\_Marongiu](#):
>
> `for x in [0.0:0.1:1.0e9]`
This is looping on an array that contains a range. You want to loop on the range itself: `for x in 0.0:0.1:1.0e9`.
---
### Author:  [@Luigi\_Marongiu](https://discourse.julialang.org/u/Luigi_Marongiu)
#### Post date: [November 28, 2020, 7:42am UTC](https://discourse.julialang.org/t/error-in-setting-a-for-loop/50891/3 "2020-11-28T07:42:22Z")
I see, it works! Thank you!
---
### Author:  [@stevengj](https://discourse.julialang.org/u/stevengj)
#### Post date: [November 28, 2020, 1:58pm UTC](https://discourse.julialang.org/t/error-in-setting-a-for-loop/50891/4 "2020-11-28T13:58:33Z")
> [@Luigi\_Marongiu](#):
>
> I also tried to define the iterator with `linspace` but `Binding linspace does not exist.` Is there a new version of it?
Yes, it is nowadays called `range(start, stop, length=n)`.