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edited Apr 13, 2017 at 12:55

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Mathematica packages are isolated, in the sense that A`Sub` need not necessarily be a "sub-package" of A` , unless you explicitly make it so. Note that when you call BeginPackage["A`Sub`"], the context path is temporarily changed to just {"A`Sub`", "System`"}, meaning it has no idea about functions in A` . To fix this, you need to load A` in your sub-package as:

BeginPackage["A`Sub`"] Needs["A`"] ... EndPackage[]

Now as you note, there is another way to load it and that is via BeginPackage["A`Sub`",{"A`"}]. These two ways of loading are not equivalent, as mentioned in this answer this answer. Be sure to read that and use what best suits your needs.

Mathematica packages are isolated, in the sense that A`Sub` need not necessarily be a "sub-package" of A` , unless you explicitly make it so. Note that when you call BeginPackage["A`Sub`"], the context path is temporarily changed to just {"A`Sub`", "System`"}, meaning it has no idea about functions in A` . To fix this, you need to load A` in your sub-package as:

BeginPackage["A`Sub`"] Needs["A`"] ... EndPackage[]

Now as you note, there is another way to load it and that is via BeginPackage["A`Sub`",{"A`"}]. These two ways of loading are not equivalent, as mentioned in this answer. Be sure to read that and use what best suits your needs.

Mathematica packages are isolated, in the sense that A`Sub` need not necessarily be a "sub-package" of A` , unless you explicitly make it so. Note that when you call BeginPackage["A`Sub`"], the context path is temporarily changed to just {"A`Sub`", "System`"}, meaning it has no idea about functions in A` . To fix this, you need to load A` in your sub-package as:

BeginPackage["A`Sub`"] Needs["A`"] ... EndPackage[]

Now as you note, there is another way to load it and that is via BeginPackage["A`Sub`",{"A`"}]. These two ways of loading are not equivalent, as mentioned in this answer. Be sure to read that and use what best suits your needs.

answered Mar 1, 2013 at 15:29

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Mathematica packages are isolated, in the sense that A`Sub` need not necessarily be a "sub-package" of A` , unless you explicitly make it so. Note that when you call BeginPackage["A`Sub`"], the context path is temporarily changed to just {"A`Sub`", "System`"}, meaning it has no idea about functions in A` . To fix this, you need to load A` in your sub-package as:

BeginPackage["A`Sub`"] Needs["A`"] ... EndPackage[]

Now as you note, there is another way to load it and that is via BeginPackage["A`Sub`",{"A`"}]. These two ways of loading are not equivalent, as mentioned in this answer. Be sure to read that and use what best suits your needs.