# Base.call() in Julia 0.6
**URL:** https://discourse.julialang.org/t/base-call-in-julia-0-6/3983
**Category:** General Usage
**Created:** [May 30, 2017, 4:34am UTC](https://discourse.julialang.org/t/base-call-in-julia-0-6/3983 "2017-05-30T04:34:43Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@charlesll](https://discourse.julialang.org/u/charlesll)
#### Post date: [May 30, 2017, 4:34am UTC](https://discourse.julialang.org/t/base-call-in-julia-0-6/3983/1 "2017-05-30T04:34:44Z")
Hi All,
I can’t find information about the usage of base.call in Julia 0.6, but it breaks some code I have and that works well in Julia 0.5…
The function I am trying to run is
```julia
immutable SavitzkyGolayFilter{M,N} end
@generated function Base.call{M,N,T}(::Type{SavitzkyGolayFilter{M,N}},
data::AbstractVector{T})
#Create Jacobian matrix
J = zeros(2M+1, N+1)
for i=1:2M+1, j=1:N+1
J[i, j] = (i-M-1)^(j-1)
end
e₁ = zeros(N+1)
e₁[1] = 1.0
#Compute filter coefficients
C = J' \ e₁
#Evaluate filter on data matrix
To = typeof(C[1] * one(T)) #Calculate type of output
expr = quote
n = size(data, 1)
smoothed = zeros($To, n)
@inbounds for i in eachindex(smoothed)
smoothed[i] += $(C[M+1])*data[i]
end
smoothed
end
for j=1:M
insert!(expr.args[6].args[2].args[2].args, 1,
:(if i - $j ≥ 1
smoothed[i] += $(C[M+1-j])*data[i-$j]
end)
)
push!(expr.args[6].args[2].args[2].args,
:(if i + $j ≤ n
smoothed[i] += $(C[M+1+j])*data[i+$j]
end)
)
end
return expr
end
```
And it returns a
`LoadError: UndefVarError: call not defined`
in Julia 0.6. I think I have missed something there ?
---
### Author:  [@Gnimuc](https://discourse.julialang.org/u/Gnimuc)
#### Post date: [May 30, 2017, 4:57am UTC](https://discourse.julialang.org/t/base-call-in-julia-0-6/3983/2 "2017-05-30T04:57:36Z")
[https://github.com/JuliaLang/julia/pull/13412](https://github.com/JuliaLang/julia/pull/13412)
`Base.call` was deprecated in v0.5, it has been removed in v0.6.
I guess you could do something like this:
`@generated function (::SavitzkyGolayFilter{M,N})(data::AbstractVector{T}) where {M, N, T}`
---
### Author:  [@charlesll](https://discourse.julialang.org/u/charlesll)
#### Post date: [May 31, 2017, 5:20am UTC](https://discourse.julialang.org/t/base-call-in-julia-0-6/3983/3 "2017-05-31T05:20:12Z")
Thanks, I did not know about that.
I tried the piece of code you suggested but got an error: UndefVarError: M not defined
I don’t understand how I should declare the generated function there… Any idea?
---
### Author:  [@Gnimuc](https://discourse.julialang.org/u/Gnimuc)
#### Post date: [May 31, 2017, 6:24am UTC](https://discourse.julialang.org/t/base-call-in-julia-0-6/3983/4 "2017-05-31T06:24:00Z")
```julia
immutable SavitzkyGolayFilter{M,N} end
@generated function (::SavitzkyGolayFilter{M,N})(data::AbstractVector{T}) where {M, N, T}
#Create Jacobian matrix
J = zeros(2M+1, N+1)
for i=1:2M+1, j=1:N+1
J[i, j] = (i-M-1)^(j-1)
end
e₁ = zeros(N+1)
e₁[1] = 1.0
#Compute filter coefficients
C = J' \ e₁
#Evaluate filter on data matrix
To = typeof(C[1] * one(T)) #Calculate type of output
expr = quote
n = size(data, 1)
smoothed = zeros($To, n)
@inbounds for i in eachindex(smoothed)
smoothed[i] += $(C[M+1])*data[i]
end
smoothed
end
for j=1:M
insert!(expr.args[6].args[2].args[2].args, 1,
:(if i - $j ≥ 1
smoothed[i] += $(C[M+1-j])*data[i-$j]
end)
)
push!(expr.args[6].args[2].args[2].args,
:(if i + $j ≤ n
smoothed[i] += $(C[M+1+j])*data[i+$j]
end)
)
end
return expr
end
```
This snippet works fine in julia-v0.6. Here are some tests:
```julia
julia> sgf = SavitzkyGolayFilter{3,2}()
SavitzkyGolayFilter{3,2}()
julia> sgf(1:10)
10-element Array{Float64,1}:
0.952381
1.90476
3.0
4.0
5.0
6.0
7.0
9.04762
8.57143
6.38095
```
is this what you were looking for?
---
### Author:  [@charlesll](https://discourse.julialang.org/u/charlesll)
#### Post date: [May 31, 2017, 6:45am UTC](https://discourse.julialang.org/t/base-call-in-julia-0-6/3983/5 "2017-05-31T06:45:21Z")
> [@Gnimuc](#):
>
> immutable SavitzkyGolayFilter{M,N} end
> @generated function (::SavitzkyGolayFilter{M,N})(data::AbstractVector{T}) where {M, N, T}
> #Create Jacobian matrix
> J = zeros(2M+1, N+1)
> for i=1:2M+1, j=1:N+1
> J[i, j] = (i-M-1)^(j-1)
> end
> e₁ = zeros(N+1)
> e₁[1] = 1.0
>
> ```
> #Compute filter coefficients
> C = J' \ e₁
>
> #Evaluate filter on data matrix
>
> To = typeof(C[1] * one(T)) #Calculate type of output
> expr = quote
> n = size(data, 1)
> smoothed = zeros($To, n)
> @inbounds for i in eachindex(smoothed)
> smoothed[i] += $(C[M+1])*data[i]
> end
> smoothed
> end
>
> for j=1:M
> insert!(expr.args[6].args[2].args[2].args, 1,
> :(if i - $j ≥ 1
> smoothed[i] += $(C[M+1-j])*data[i-$j]
> end)
> )
> push!(expr.args[6].args[2].args[2].args,
> :(if i + $j ≤ n
> smoothed[i] += $(C[M+1+j])*data[i+$j]
> end)
> )
> end
>
> return expr
>
> ```
>
> end
Yes, indeed, it works in Julia V0.6, but not in v0.5.2… I got a first error:
> syntax: space before “{” not allowed in “where {”
and if I correct it by removing the space I get the error
> UndefVarError: M not defined
---
### Author:  [@Gnimuc](https://discourse.julialang.org/u/Gnimuc)
#### Post date: [May 31, 2017, 6:52am UTC](https://discourse.julialang.org/t/base-call-in-julia-0-6/3983/6 "2017-05-31T06:52:40Z")
`where` is a new syntax introduced in v0.6. In v0.5.2, your original version should work.
---
### Author:  [@charlesll](https://discourse.julialang.org/u/charlesll)
#### Post date: [May 31, 2017, 8:15am UTC](https://discourse.julialang.org/t/base-call-in-julia-0-6/3983/7 "2017-05-31T08:15:37Z")
Yes, it works in 0.5.2, but is there any chance to make it work for both 0.5.2 and 0.6?
---
### Author:  [@Gnimuc](https://discourse.julialang.org/u/Gnimuc)
#### Post date: [May 31, 2017, 8:28am UTC](https://discourse.julialang.org/t/base-call-in-julia-0-6/3983/8 "2017-05-31T08:28:12Z")
> [@Gnimuc](#):
>
> immutable SavitzkyGolayFilter{M,N} end
the corresponding version of `where` in v0.5 is `@generated function (::SavitzkyGolayFilter{M,N}){M,N,T}(data::AbstractVector{T})` which works fine in both v0.5 and v0.6 🙂