#89 Improperly defined

[Daniel Volinski]

Hi All,

The following code was copied from the EXCALC user guide:

%% Example 20, Page 468

load_package "excalc"$
coframe e t=d t,e x=d x,e y=d y with signature -1,1,1;  
pform f(k,l)=0$
antisymmetric f$
f(-t,-x):=ex$
f(-x,-y):=b$
f(-t,-y):=0$  
on nero$
f(k,-l):=f(k,-l);  

I get the message "f(-t,-t) improperly defined in terms of itself", the documentation says otherwise.
What is wrong?

Thanks,

Daniel

[Eberhard Schruefer]

Thanks for reporting this. It is another case of not updated documentation. The example code should read

load_package "excalc"$
coframe e t=d t,e x=d x,e y=d y with signature -1,1,1;
pform f(k,l)=0$
antisymmetric f$
f(k,l) := 0$
f(-t,-x):=ex$
f(-x,-y):=b$
f(-t,-y):=0$
on nero$
f(k,-l);

Apologies. The documentation will be adjusted in the next snapshot.
Eberhard

[Daniel Volinski]

Got it, thanks.

[Rainer Schöpf]

Documentation updated