ERROR: MethodError: objects of type Tuple{} are not callable-CodePudding

I have never used Julia and I am following a tutorial. I have reached an instruction that are written below. When I tried the Lon3D, Lat3D,Depth3D =LonLatDepthGrid(lon,lat,depth) I got and error saying ERROR: UndefVarError: LonLatDepthGrid not defined I tried creating the variable using LonLatDepthGrid =() I ran the Lon3d.... command again then got the following error * MethodError: objects of type Tuple{} are not callable* What am I missing???? THanks K

Here is the order in which I am defining variables:

lat = ncread("APVC.ANT RF.Ward.2014_kmps.nc","latitude")
lon = ncread("APVC.ANT RF.Ward.2014_kmps.nc","longitude") 
depth = ncread("APVC.ANT RF.Ward.2014_kmps.nc","depth")
Vs_3D = ncread("APVC.ANT RF.Ward.2014_kmps.nc","vs")
depth = -1 .* depth
Lon3D,Lat3D,Depth3D = LonLatDepthGrid(lon, lat, depth);

I tried creating the variable using LonLatDepthGrid =() I ran the Lon3d.... command again then got the following error * MethodError: objects of type Tuple{} are not callable* What am I missing???? THanks K

CodePudding user response：

You created a tuple called LonLatDepthGrid:

julia> LonLatDepthGrid =()

julia> typeof(LonLatDepthGrid)
Tuple{}

But then you tried to use the tuple as a function:

julia> LonLatDepthGrid(...)
ERROR: MethodError: objects of type Tuple{} are not callable

Also, it's difficult to help you further without knowing what the packages you're using...

CodePudding user response：

Please read the Julia documentation about installing packages from their repositories.

GeophysicalModelGenerator.jl needs to be installed:

julia> ]add GeophysicalModelGenerator

...

julia> using GeophysicalModelGenerator

Now this should compile:

Lat         =   1.0:3:10.0;
Lon         =   11.0:4:20.0;
Depth       =   (-20:5:-10)*km;
Lon3D,Lat3D,Depth3D = LonLatDepthGrid(Lon, Lat, Depth);