+- HP Forums (https://www.hpmuseum.org/forum)
+-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html)
+--- Forum: HP Prime (/forum-5.html)
+--- Thread: Another xCAS commands --> Prime. discussion (/thread-14192.html)
Another xCAS commands --> Prime. discussion - compsystems - 12-19-2019 02:39 PM
Hi HP-Prime Team, sorry for the electronic translation
There is a command that is not included in the latest firmware version.
with_sqrt (True / False)
it's a flag type cmd for factored in terms of irreducible factors with respect to the rational numbers. (In other words, none of the polynomials in the factored form can be factored further without introducing radicals.)
The idea is to work with the command line in the history view without going to the configuration view, for this reason, HP-Prime Team must include with_sqrt(True / False) in the next firmware improvements
sentences to enter the history view to observe the operation of with_sqrt ()
Xcas Code
PHP Code:
test_withsqrt_flag(x):={
local poly1;
purge(x);
with_sqrt( False );
poly1 := x^5 -4*x^4 -7*x^3 -41*x^2 -4*x+35;
print( factor( poly1 ) ); // (x+1) * (x^2-7*x+5) * (x^2+2*x+7)
with_sqrt( True );
print( factor( poly1 )); // (x+(-√29-7)/2) * (x+(√29-7)/2)*(x+1) * (x^2+2*x+7)
return poly1;
};
RE: Another xCAS commands --> Prime. discussion - compsystems - 12-25-2019 08:03 PM
Hello, In the symbolic environment CAS, the following mathematical expression should return euler_gamma constant
limit(Σ(1/k,k,1,n)-ln(n),n, +infinity) [enter] 0.577215664902 // current hp-prime
limit(Σ(1/k,k,1,n)-ln(n),n, +infinity) [↵] returns euler_gamma // Xcas
for which it is required to add the constant euler_gamma in a future version
euler_gamma [↵] Xcas returns euler_gamma
evalf(euler_gamma) [↵] Xcas returns 0.577215664902
%gamma -> 0.577215664902 // MAXIMA CAS
Frn info. > https://www-fourier.ujf-grenoble.fr/~parisse/giac/doc/fr/cascmd_fr/index.html#sec201
Eng info. > https://www-fourier.ujf-grenoble.fr/~parisse/giac/doc/en/cascmd_en/node4.html
Spn info > http://www.eonicasys.com/CAS/xcas/cascmd_eng_spn/6.1/constantes_matematicas_simbolicas_cmd_xcas.txt