Passing arrays to MathLink

[gganapat]

Hi, while trying out MathLink.jl for Wolfram/Mathematica, I'm stuck on passing on arrays to be evaluated.

In Pluto;

a = 10;

weval(W`Sqrt[$a]`) gives right answer but if I do

a = collect(10:30)

weval(W`Sqrt[$a]`),

I get

Part::partd: Part specification Sqrt[[10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30]] is longer than depth of object. Part::partd: Part specification Sqrt[[10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30]] is longer than depth of object.

I tried different things, but stuck on how to proceed. Basically Mathematica/Wolfram Engine is looking for lists in the form {10,11,12,..} but $a passes [10,11,12..]

I'm finding MathLink.jl really neat but some sticking points exist.

Thanks!

[fremling]

Hi,

The problem with your approach is that $a is creating a table that will have valid julia syntax, whereas you want somethings that will have valid mathematica syntax.

The way around this is to use that MathLink can construct Mathematica functions the same way as Mathematica varaibles, using the W"<var>" command. There for try this code:

a = collect(10:30)
weval(W"Sqrt"(a))

Here the W"Sqrt" will handle the vector a = collect(10:30) correctly.

[gganapat]

Thank you! This worked perfectly well.

gani -