On Saturday, January 27, 2018 at 10:29:22 PM UTC-6, oldk1331 wrote:
>
> On Sun, Jan 28, 2018 at 12:22 PM, 'Nasser M. Abbasi' via FriCAS -
> computer algebra system <[email protected] <javascript:>> wrote:
> > I could not find, or know what to search for, to turn on tracing in
> Fricas.
> >
> > For example, Fricas hangs on this
> >
> > integrate((4*x^4+3)^(1/4)/x^2,x)
> >
> > And was just curious why that is.
>
> First, if you use "setSimplifyDenomsFlag(true)",
> then this integral returns in 2 seconds.
>
>
The problem is that I do not know when to turn the above on or off.
If I do "setSimplifyDenomsFlag(true)" at start of the script, then now this
integral hangs
integrate((A*x+B)/(5*x^2-18*x+17)/(10*x^2-22*x+13)^(1/2),x)
But integrate((4*x^4+3)^(1/4)/x^2,x) does not hang (it takes about 20
seconds
to finish on my Linux, but I am running VBox).
And If I do "setSimplifyDenomsFlag(false)" then now
integrate((A*x+B)/(5*x^2-18*x+17)/(10*x^2-22*x+13)^(1/2),x)
does not hang any more, but integrate((4*x^4+3)^(1/4)/x^2,x) hangs.
How is a user supposed to know what to set it to? Given I have no idea
what this flag does also. I have to decide at top of the script what to set
it to.
> > I see there is a )trace command, but did not know how to use it
> > for the above. Is possible to give simple example of how to use
> > )trace to see the call flow for the above integrate command?
> >
> > Using 1.3.2
> >
> > Thanks
> > --Nasser
>
>
> You can see the help of ')trace' by ')help trace'.
>
> It is more difficult to use because you need to know which
> Domain/Package/functions to trace. And it can generate
> a lot of output.
>
> On the other hand, you can use 'Ctrl-C' to interrupt and
> check its backtrace, by using ')set break break' first.
> The backtrace may also be long and difficult to read.
>
Ok, thanks
--Nasser
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