Hi,

examining series expansion.........../run_exams: line 3: 12967 segment fault

Sorry, I cannot reproduce this. I believe it is a compiler bug. Which version do you have? gcc 3.3.1 (Debian prerelease) had some serious issues which could lead to exactly such faulty behavior. If that is your compiler, upgrade. As a general suggestion: dump your vendor's compiler. Roll your own one from the released tarballs. That procedure has always been the less troublesome. On Fri, 26 Sep 2003 anaximander@gmx.de wrote:

symbol x("x"); ex f = cos( pow(x, 2) ) - x/3; // Funktion

cout << "1. symbolische Ableitung" << endl; ex fx = f.diff(x,1); cout << fx << endl;

// Nun: Versuch, den numerischen Wert an der Stelle 1 auszugeben: // vgl. tutorial.ps S. 41 cout << "1. Ableitung an der Stelle 1" << endl; ex hilf1 = fx.subs( x == 1 ); numeric fx_n = ex_to<numeric>(hilf1);// numerischer Wert, vgl. tutorial.ps S. 38

Either use evalf() as on p. 38, upper half or check whether you really got a numeric object, as on p. 38, lower half.

/* the following command breaks the program and gives the output: "Internal error: statement in file float/misc/cl_F_digits.cc, line 30 has been reached!! Please send the authors of the program a description how you produced this error!" */ cout << fx_n << endl; // comment out to see the second error

/* the following command breaks the program and gives another output: Internal error: statement in file real/elem/cl_R_mul.cc, line 93 has been reached!! Please send the authors of the program a description how you produced this error! */ cout << evalf(fx_n) << endl;

Too late. Calling evalf on something that is already ill-defined. (Hint: sin(1) is an exact symbolic expression a pseudo function.) Regards -richy. -- Richard B. Kreckel <Richard.Kreckel@GiNaC.DE> <http://www.ginac.de/~kreckel/>