For example, I write a simple script in Mathematica like this: x = 4; y = 5; x*y. I want to get the output of x*y.
I saved it as an .m file. But when I opened the file, it showed
(* ::Package:: *)
(* ::Input:: *)
(*x=4;y=5;x*y*)
Why there is (**)?
If there is (**) in the code, the inner script will not run, right?
I assume you created a notebook, wrote something in it, then used File -> Save As... and chose "m. file"?
First of all, if you are looking for create a plain text Mathematica script (.m file or .wl file), it is best not to use notebooks at all. Create an .m file directly, and edit that.
That said, if you need to save a notebook as an .m file, only "initialization cells" will be included. Cells may be marked as "initialization cell" individually, or in groups. Check Cell -> Cell Properties. Some cell types, such as Code cells, have the "initialization cell" property by default. Input cells do not.
A simple way to add the initialization property to many cells at once is to place them under a Section heading (add a Section cell type above them), select the cell group, and add the "initialization group" property to it.
