Tnx! srange does the tric. Maybe srange (instead of range) should be promoted far more for this reason! Roland
On 6 sep, 00:52, "Timothy Clemans" <[EMAIL PROTECTED]> wrote: > srange gives a list of Sage integers and follows the syntax of range. > > On Fri, Sep 5, 2008 at 5:41 PM, Harald Schilly <[EMAIL PROTECTED]> wrote: > > > hello roland > > > I cross posted this on the sage-support mailing list > >http://groups.google.com/group/sage-support > > > regarding your bugreport: > >http://spreadsheets.google.com/pub?key=pCwvGVwSMxTzT6E2xNdo5fA > > >> In loop "/' operand incorrect > >> Hi. Please view worksheet which is publicly viewable > >> athttp://75.75.6.176:80/home/pub/0 > >> In a loop, and only then, suddenly 583/2 becomes 291 ...? > >> Roland, sage 3.1.1 on Windows/VMWare > > > the "problem" is, that range is a native python command and all this > > happens because it is python "only". > > if you just enter numbers, sage preparses them as "Integer(n)" .. then > > they are more complex objects. > > > there is not much to do about this, either convert to sage integers or > > well, someone has to break python - but that's extremely dangerous. > > > so, as long as i understood your lengthy example correct, here are two > > commands, run in "pure" python to clarify: > > >>>> for i in range(1,6): print i/2 > > ... > > 0 > > 1 > > 1 > > 2 > > 2 > > >>>> for i in range(1,6): print float(i)/2 > > ... > > 0.5 > > 1.0 > > 1.5 > > 2.0 > > 2.5 > > > ----- > > in sage > > > sage: preparse("for i in range(1,6): print i/2") > > 'for i in range(Integer(1),Integer(6)): print i/Integer(2)' > > > above, division by an integer! > > > sage: for i in range(1,6): print i/2 > > ....: > > 1/2 > > 1 > > 3/2 > > 2 > > 5/2 > > > also, you can use the "type" command to get the objects type. native > > integers are "int" and sage's "Integer" > > > h --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
