CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutSign UpSign In

Real-time collaboration for Jupyter Notebooks, Linux Terminals, LaTeX, VS Code, R IDE, and more,
all in one place.

| Download

GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it

Views: 418346
Tweet
Share
Share
1
  

2
  1 Introduction

3
  

4
  HomalgToCAS  is  one of the core packages of the homalg project [hpa10]. But

5
  as  one  of  the  rather  technical packages, this manual is probably not of

6
  interest  for  the  average  uers.  The average user will usually not get in

7
  direct contact with the operations provided by this package.

8
  

9
  Quoting  from  the  Appendix  'homalg: The Core Packages and the Idea behind

10
  their Splitting' of the homalg package manual (--> 'homalg: HomalgToCAS'):

11
  

12
  The  package  HomalgToCAS (which needs the homalg package) includes all what

13
  is  needed to let the black boxes used by homalg reside in external computer

14
  algebra  systems.  So  as mentioned above, HomalgToCAS is the right place to

15
  declare   the  three  GAP  representations  external  rings,  external  ring

16
  elements,  and external matrices. Still, HomalgToCAS is independent from the

17
  external  computer  algebra  system  with  which  GAP  will  communicate and

18
  independent of how this communication physically looks like.

19
  

20
  

21
  1.1 HomalgToCAS provides ...

22
  

23
      Declaration and construction of

24
  

25
            external   objects  (which  are  pointers  to  data  (rings,ring

26
              elements, matrices, ...) residing in external systems)

27
  

28
            external rings (as a new representation for the GAP4-category of

29
              homalg rings)

30
  

31
            external   ring  elements  (as  a  new  representation  for  the

32
              GAP4-category of homalg ring elements)

33
  

34
            external matrices (as a new representation for the GAP4-category

35
              of homalg matrices)

36
  

37
      LaunchCAS:  the  standard  interface used by homalg to launch external

38
        systems

39
  

40
      TerminateCAS:  the  standard  interface  used  by  homalg to terminate

41
        external systems

42
  

43
      homalgSendBlocking:  the  standard  interface  used  by homalg to send

44
        commands to external systems

45
  

46
      External  garbage  collection: delete the data in the external systems

47
        that became obsolete for homalg

48
  

49
      homalgIOMode: decide how much of the communication you want to see

50
  

51


52