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+--- Thread: Variable e not usable for local-variable (/thread-4621.html)
Variable e not usable for local-variable - Arno K - 09-01-2015 10:01 PM
The program mentioned in the other thread needed some local variables, as I am lazy I usually take short names and came up with e, as it should hold the result of euler(n), the editor refused to take it. So I used the cas to find out that e cannot be taken as a variable at all although I think to have read that all small letters are available. That is not very serious but can be changed if the system used another symbol, perhaps a fat printed e, for 2.718..., just like it does with i.
Maybe more meaningful error messages, especially in cas-programs where no debugger is available would be helpful, too. Errors like this take more time to find than writing the whole program.
Arno
RE: Variable e not usable for local-variable - Joe Horn - 09-02-2015 03:22 AM
(09-01-2015 10:01 PM)Arno K Wrote: The program mentioned in the other thread needed some local variables, as I am lazy I usually take short names and came up with e, as it should hold the result of euler(n), the editor refused to take it. So I used the cas to find out that e cannot be taken as a variable at all although I think to have read that all small letters are available.
Neither e nor i can be used as variables in Home or in CAS.
(09-01-2015 10:01 PM)Arno K Wrote: That is not very serious but can be changed if the system used another symbol, perhaps a fat printed e, for 2.718..., just like it does with i.
Even though i is often displayed as a stylized i, it can be keyed in by the user as a plain i, so i must still remain a reserved PPL word. So even if they started calling e "e", it wouldn't stop e from being a reserved PPL word.
RE: Variable e not usable for local-variable - Arno K - 09-02-2015 08:12 AM
(09-02-2015 03:22 AM)Joe Horn Wrote:(09-01-2015 10:01 PM)Arno K Wrote: The program mentioned in the other thread needed some local variables, as I am lazy I usually take short names and came up with e, as it should hold the result of euler(n), the editor refused to take it. So I used the cas to find out that e cannot be taken as a variable at all although I think to have read that all small letters are available.
Neither e nor i can be used as variables in Home or in CAS.
(09-01-2015 10:01 PM)Arno K Wrote: That is not very serious but can be changed if the system used another symbol, perhaps a fat printed e, for 2.718..., just like it does with i.
Even though i is often displayed as a stylized i, it can be keyed in by the user as a plain i, so i must still remain a reserved PPL word. So even if they started calling e "e", it wouldn't stop e from being a reserved PPL word.
Well, that is correct and perhaps ok, but contrary to e i can be used as a local variable and this is what I am interested in.
Arno