Hi Yared, Please see below,,
On Thursday, July 21, 2016 at 11:19:44 AM UTC-4, Yared Melese wrote: > Hi Islam, > > Thanks for your input > > I was able to find all windowing functions; however, there is nothing > about PSD ( power spectral density). In python and matlab, there is > function pwelch which does both windowing and FFT and wondering if there is > the same function in Julia. > Did you take a look at `welch_pgram` function? http://dspjl.readthedocs.io/en/latest/periodograms.html#welch_pgram > Here is simple trial I had but it is complaining about type mismatch > > fb= fb[:]*hamming(length(fb)) > fb = fft(fb) # take FFT of signal > > LoadError: MethodError: `*` has no method matching > *(::Array{Complex{Float64},1}, ::Array{Float64,1}) > Closest candidates are: > *(::Any, ::Any, !Matched::Any, !Matched::Any...) > > *{T<:Union{Complex{Float32},Complex{Float64},Float32,Float64},S}(!Matched::Union{DenseArray{T<:Union{Complex{Float32},Complex{Float64},Float32,Float64},2},SubArray{T<:Union{Complex{Float32},Complex{Float64},Float32,Float64},2,A<:DenseArray{T,N},I<:Tuple{Vararg{Union{Colon,Int64,Range{Int64}}}},LD}}, > > ::Union{DenseArray{S,1},SubArray{S,1,A<:DenseArray{T,N},I<:Tuple{Vararg{Union{Colon,Int64,Range{Int64}}}},LD}}) > > *{TA,TB}(!Matched::Base.LinAlg.AbstractTriangular{TA,S<:AbstractArray{T,2}}, > ::Union{DenseArray{TB,1},DenseArray{TB,2},SubArray{TB,1,A<:DenseArray{T,N},I<:Tuple{Vararg{Union{Colon,Int64,Range{Int64}}}},LD},SubArray{TB,2,A<:DenseArray{T,N},I<:Tuple{Vararg{Union{Colon,Int64,Range{Int64}}}},LD}}) > ... > in include_string at loading.jl:282 > in include_string at C:\Users\melese\.julia\v0.4\CodeTools\src\eval.jl:32 > in anonymous at C:\Users\melese\.julia\v0.4\Atom\src\eval.jl:84 > in withpath at C:\Users\melese\.julia\v0.4\Requires\src\require.jl:37 > in withpath at C:\Users\melese\.julia\v0.4\Atom\src\eval.jl:53 > [inlined code] from C:\Users\melese\.julia\v0.4\Atom\src\eval.jl:83 > in anonymous at task.jl:58 > while loading D:\userdata\melese\Desktop\fft.jl, in expression starting on > line 23 > > This particular error seems to be occurring at the `fb= fb[:]*hamming(length(fb))` line. It looks like you are multiplying an _vector_ of complex doubles with a _vector_ of doubles, which is not mathematically defined because of the dimension mismatch, since both vectors are of dimension Nx1. Instead, my guess is that you meant element-wise multiplication using `.*`. But again, I think the `welch_pgram` function should meet your needs. -Islam > > On Wednesday, July 20, 2016 at 9:15:40 AM UTC-5, Yared Melese wrote: > >> Hello >> >> Would you please let me know the package available to do windowing, FFT >> and PSD? >> >> Currently, I have bin file that I have processed in Julia and need to >> window it and take preferably PSD but FFT work as well >> >> Thanks >> Yared >> >> >> >>
