#include "constant.h"
#include "numeric.h"
#include "power.h"
+#include "relational.h"
+#include "symbol.h"
+#include "utils.h"
+
+#ifndef NO_GINAC_NAMESPACE
+namespace GiNaC {
+#endif // ndef NO_GINAC_NAMESPACE
//////////
// exponential function
//////////
-ex exp_evalf(ex const & x)
+static ex exp_evalf(ex const & x)
{
BEGIN_TYPECHECK
TYPECHECK(x,numeric)
return exp(ex_to_numeric(x)); // -> numeric exp(numeric)
}
-ex exp_eval(ex const & x)
+static ex exp_eval(ex const & x)
{
// exp(0) -> 1
if (x.is_zero()) {
- return exONE();
+ return _ex1();
}
// exp(n*Pi*I/2) -> {+1|+I|-1|-I}
- ex TwoExOverPiI=(2*x)/(Pi*I);
+ ex TwoExOverPiI=(_ex2()*x)/(Pi*I);
if (TwoExOverPiI.info(info_flags::integer)) {
- numeric z=mod(ex_to_numeric(TwoExOverPiI),numeric(4));
- if (z.is_equal(numZERO()))
- return exONE();
- if (z.is_equal(numONE()))
+ numeric z=mod(ex_to_numeric(TwoExOverPiI),_num4());
+ if (z.is_equal(_num0()))
+ return _ex1();
+ if (z.is_equal(_num1()))
return ex(I);
- if (z.is_equal(numTWO()))
- return exMINUSONE();
- if (z.is_equal(numTHREE()))
+ if (z.is_equal(_num2()))
+ return _ex_1();
+ if (z.is_equal(_num3()))
return ex(-I);
}
// exp(log(x)) -> x
return x.op(0);
// exp(float)
- if (x.info(info_flags::numeric) && !x.info(info_flags::rational))
+ if (x.info(info_flags::numeric) && !x.info(info_flags::crational))
return exp_evalf(x);
return exp(x).hold();
-}
+}
-ex exp_diff(ex const & x, unsigned diff_param)
+static ex exp_diff(ex const & x, unsigned diff_param)
{
- ASSERT(diff_param==0);
+ GINAC_ASSERT(diff_param==0);
+ // d/dx exp(x) -> exp(x)
return exp(x);
}
// natural logarithm
//////////
-ex log_evalf(ex const & x)
+static ex log_evalf(ex const & x)
{
BEGIN_TYPECHECK
TYPECHECK(x,numeric)
return log(ex_to_numeric(x)); // -> numeric log(numeric)
}
-ex log_eval(ex const & x)
+static ex log_eval(ex const & x)
{
if (x.info(info_flags::numeric)) {
- // log(1) -> 0
- if (x.is_equal(exONE()))
- return exZERO();
- // log(-1) -> I*Pi
- if (x.is_equal(exMINUSONE()))
- return (I*Pi);
- // log(I) -> Pi*I/2
- if (x.is_equal(I))
- return (I*Pi*numeric(1,2));
- // log(-I) -> -Pi*I/2
- if (x.is_equal(-I))
- return (I*Pi*numeric(-1,2));
- // log(0) -> throw singularity
- if (x.is_equal(exZERO()))
+ if (x.is_equal(_ex1())) // log(1) -> 0
+ return _ex0();
+ if (x.is_equal(_ex_1())) // log(-1) -> I*Pi
+ return (I*Pi);
+ if (x.is_equal(I)) // log(I) -> Pi*I/2
+ return (Pi*I*_num1_2());
+ if (x.is_equal(-I)) // log(-I) -> -Pi*I/2
+ return (Pi*I*_num_1_2());
+ if (x.is_equal(_ex0())) // log(0) -> infinity
throw(std::domain_error("log_eval(): log(0)"));
// log(float)
- if (!x.info(info_flags::rational))
+ if (!x.info(info_flags::crational))
return log_evalf(x);
}
+ // log(exp(t)) -> t (for real-valued t):
+ if (is_ex_the_function(x, exp)) {
+ ex t=x.op(0);
+ if (t.info(info_flags::real))
+ return t;
+ }
return log(x).hold();
-}
+}
-ex log_diff(ex const & x, unsigned diff_param)
+static ex log_diff(ex const & x, unsigned diff_param)
{
- ASSERT(diff_param==0);
+ GINAC_ASSERT(diff_param==0);
+ // d/dx log(x) -> 1/x
return power(x, -1);
}
// sine (trigonometric function)
//////////
-ex sin_evalf(ex const & x)
+static ex sin_evalf(ex const & x)
{
BEGIN_TYPECHECK
TYPECHECK(x,numeric)
return sin(ex_to_numeric(x)); // -> numeric sin(numeric)
}
-ex sin_eval(ex const & x)
-{
- // sin(n*Pi) -> 0
- ex xOverPi=x/Pi;
- if (xOverPi.info(info_flags::integer))
- return exZERO();
-
- // sin((2n+1)*Pi/2) -> {+|-}1
- ex xOverPiMinusHalf=xOverPi-exHALF();
- if (xOverPiMinusHalf.info(info_flags::even))
- return exONE();
- else if (xOverPiMinusHalf.info(info_flags::odd))
- return exMINUSONE();
+static ex sin_eval(ex const & x)
+{
+ // sin(n*Pi/6) -> { 0 | +/-1/2 | +/-sqrt(3)/2 | +/-1 }
+ ex SixExOverPi = _ex6()*x/Pi;
+ if (SixExOverPi.info(info_flags::integer)) {
+ numeric z = smod(ex_to_numeric(SixExOverPi),_num12());
+ if (z.is_equal(_num_5())) // sin(7*Pi/6) -> -1/2
+ return _ex_1_2();
+ if (z.is_equal(_num_4())) // sin(8*Pi/6) -> -sqrt(3)/2
+ return _ex_1_2()*power(_ex3(),_ex1_2());
+ if (z.is_equal(_num_3())) // sin(9*Pi/6) -> -1
+ return _ex_1();
+ if (z.is_equal(_num_2())) // sin(10*Pi/6) -> -sqrt(3)/2
+ return _ex_1_2()*power(_ex3(),_ex1_2());
+ if (z.is_equal(_num_1())) // sin(11*Pi/6) -> -1/2
+ return _ex_1_2();
+ if (z.is_equal(_num0())) // sin(0) -> 0
+ return _ex0();
+ if (z.is_equal(_num1())) // sin(1*Pi/6) -> 1/2
+ return _ex1_2();
+ if (z.is_equal(_num2())) // sin(2*Pi/6) -> sqrt(3)/2
+ return _ex1_2()*power(_ex3(),_ex1_2());
+ if (z.is_equal(_num3())) // sin(3*Pi/6) -> 1
+ return _ex1();
+ if (z.is_equal(_num4())) // sin(4*Pi/6) -> sqrt(3)/2
+ return _ex1_2()*power(_ex3(),_ex1_2());
+ if (z.is_equal(_num5())) // sin(5*Pi/6) -> 1/2
+ return _ex1_2();
+ if (z.is_equal(_num6())) // sin(6*Pi/6) -> 0
+ return _ex0();
+ }
if (is_ex_exactly_of_type(x, function)) {
ex t=x.op(0);
// sin(asin(x)) -> x
if (is_ex_the_function(x, asin))
return t;
- // sin(acos(x)) -> (1-x^2)^(1/2)
+ // sin(acos(x)) -> sqrt(1-x^2)
if (is_ex_the_function(x, acos))
- return power(exONE()-power(t,exTWO()),exHALF());
+ return power(_ex1()-power(t,_ex2()),_ex1_2());
// sin(atan(x)) -> x*(1+x^2)^(-1/2)
if (is_ex_the_function(x, atan))
- return t*power(exONE()+power(t,exTWO()),exMINUSHALF());
+ return t*power(_ex1()+power(t,_ex2()),_ex_1_2());
}
// sin(float) -> float
- if (x.info(info_flags::numeric) && !x.info(info_flags::rational))
+ if (x.info(info_flags::numeric) && !x.info(info_flags::crational))
return sin_evalf(x);
return sin(x).hold();
}
-ex sin_diff(ex const & x, unsigned diff_param)
+static ex sin_diff(ex const & x, unsigned diff_param)
{
- ASSERT(diff_param==0);
+ GINAC_ASSERT(diff_param==0);
+ // d/dx sin(x) -> cos(x)
return cos(x);
}
// cosine (trigonometric function)
//////////
-ex cos_evalf(ex const & x)
+static ex cos_evalf(ex const & x)
{
BEGIN_TYPECHECK
TYPECHECK(x,numeric)
return cos(ex_to_numeric(x)); // -> numeric cos(numeric)
}
-ex cos_eval(ex const & x)
-{
- // cos(n*Pi) -> {+|-}1
- ex xOverPi=x/Pi;
- if (xOverPi.info(info_flags::even))
- return exONE();
- else if (xOverPi.info(info_flags::odd))
- return exMINUSONE();
-
- // cos((2n+1)*Pi/2) -> 0
- ex xOverPiMinusHalf=xOverPi-exHALF();
- if (xOverPiMinusHalf.info(info_flags::integer))
- return exZERO();
+static ex cos_eval(ex const & x)
+{
+ // cos(n*Pi/6) -> { 0 | +/-1/2 | +/-sqrt(3)/2 | +/-1 }
+ ex SixExOverPi = _ex6()*x/Pi;
+ if (SixExOverPi.info(info_flags::integer)) {
+ numeric z = smod(ex_to_numeric(SixExOverPi),_num12());
+ if (z.is_equal(_num_5())) // cos(7*Pi/6) -> -sqrt(3)/2
+ return _ex_1_2()*power(_ex3(),_ex1_2());
+ if (z.is_equal(_num_4())) // cos(8*Pi/6) -> -1/2
+ return _ex_1_2();
+ if (z.is_equal(_num_3())) // cos(9*Pi/6) -> 0
+ return _ex0();
+ if (z.is_equal(_num_2())) // cos(10*Pi/6) -> 1/2
+ return _ex1_2();
+ if (z.is_equal(_num_1())) // cos(11*Pi/6) -> sqrt(3)/2
+ return _ex1_2()*power(_ex3(),_ex1_2());
+ if (z.is_equal(_num0())) // cos(0) -> 1
+ return _ex1();
+ if (z.is_equal(_num1())) // cos(1*Pi/6) -> sqrt(3)/2
+ return _ex1_2()*power(_ex3(),_ex1_2());
+ if (z.is_equal(_num2())) // cos(2*Pi/6) -> 1/2
+ return _ex1_2();
+ if (z.is_equal(_num3())) // cos(3*Pi/6) -> 0
+ return _ex0();
+ if (z.is_equal(_num4())) // cos(4*Pi/6) -> -1/2
+ return _ex_1_2();
+ if (z.is_equal(_num5())) // cos(5*Pi/6) -> -sqrt(3)/2
+ return _ex_1_2()*power(_ex3(),_ex1_2());
+ if (z.is_equal(_num6())) // cos(6*Pi/6) -> -1
+ return _ex_1();
+ }
if (is_ex_exactly_of_type(x, function)) {
ex t=x.op(0);
return t;
// cos(asin(x)) -> (1-x^2)^(1/2)
if (is_ex_the_function(x, asin))
- return power(exONE()-power(t,exTWO()),exHALF());
+ return power(_ex1()-power(t,_ex2()),_ex1_2());
// cos(atan(x)) -> (1+x^2)^(-1/2)
if (is_ex_the_function(x, atan))
- return power(exONE()+power(t,exTWO()),exMINUSHALF());
+ return power(_ex1()+power(t,_ex2()),_ex_1_2());
}
// cos(float) -> float
- if (x.info(info_flags::numeric) && !x.info(info_flags::rational))
+ if (x.info(info_flags::numeric) && !x.info(info_flags::crational))
return cos_evalf(x);
return cos(x).hold();
}
-ex cos_diff(ex const & x, unsigned diff_param)
+static ex cos_diff(ex const & x, unsigned diff_param)
{
- ASSERT(diff_param==0);
+ GINAC_ASSERT(diff_param==0);
- return numMINUSONE()*sin(x);
+ // d/dx cos(x) -> -sin(x)
+ return _ex_1()*sin(x);
}
REGISTER_FUNCTION(cos, cos_eval, cos_evalf, cos_diff, NULL);
// tangent (trigonometric function)
//////////
-ex tan_evalf(ex const & x)
+static ex tan_evalf(ex const & x)
{
BEGIN_TYPECHECK
TYPECHECK(x,numeric)
return tan(ex_to_numeric(x));
}
-ex tan_eval(ex const & x)
-{
- // tan(n*Pi/3) -> {0|3^(1/2)|-(3^(1/2))}
- ex ThreeExOverPi=numTHREE()*x/Pi;
- if (ThreeExOverPi.info(info_flags::integer)) {
- numeric z=mod(ex_to_numeric(ThreeExOverPi),numeric(3));
- if (z.is_equal(numZERO()))
- return exZERO();
- if (z.is_equal(numONE()))
- return power(exTHREE(),exHALF());
- if (z.is_equal(numTWO()))
- return -power(exTHREE(),exHALF());
+static ex tan_eval(ex const & x)
+{
+ // tan(n*Pi/6) -> { 0 | +/-sqrt(3) | +/-sqrt(3)/2 }
+ ex SixExOverPi = _ex6()*x/Pi;
+ if (SixExOverPi.info(info_flags::integer)) {
+ numeric z = smod(ex_to_numeric(SixExOverPi),_num6());
+ if (z.is_equal(_num_2())) // tan(4*Pi/6) -> -sqrt(3)
+ return _ex_1()*power(_ex3(),_ex1_2());
+ if (z.is_equal(_num_1())) // tan(5*Pi/6) -> -sqrt(3)/3
+ return _ex_1_3()*power(_ex3(),_ex1_2());
+ if (z.is_equal(_num0())) // tan(0) -> 0
+ return _ex0();
+ if (z.is_equal(_num1())) // tan(1*Pi/6) -> sqrt(3)/3
+ return _ex1_3()*power(_ex3(),_ex1_2());
+ if (z.is_equal(_num2())) // tan(2*Pi/6) -> sqrt(3)
+ return power(_ex3(),_ex1_2());
+ if (z.is_equal(_num3())) // tan(3*Pi/6) -> infinity
+ throw (std::domain_error("tan_eval(): infinity"));
}
-
- // tan((2n+1)*Pi/2) -> throw
- ex ExOverPiMinusHalf=x/Pi-exHALF();
- if (ExOverPiMinusHalf.info(info_flags::integer))
- throw (std::domain_error("tan_eval(): infinity"));
-
+
if (is_ex_exactly_of_type(x, function)) {
ex t=x.op(0);
// tan(atan(x)) -> x
return t;
// tan(asin(x)) -> x*(1+x^2)^(-1/2)
if (is_ex_the_function(x, asin))
- return t*power(exONE()-power(t,exTWO()),exMINUSHALF());
+ return t*power(_ex1()-power(t,_ex2()),_ex_1_2());
// tan(acos(x)) -> (1-x^2)^(1/2)/x
if (is_ex_the_function(x, acos))
- return power(t,exMINUSONE())*power(exONE()-power(t,exTWO()),exHALF());
+ return power(t,_ex_1())*power(_ex1()-power(t,_ex2()),_ex1_2());
}
// tan(float) -> float
- if (x.info(info_flags::numeric) && !x.info(info_flags::rational)) {
+ if (x.info(info_flags::numeric) && !x.info(info_flags::crational)) {
return tan_evalf(x);
}
return tan(x).hold();
}
-ex tan_diff(ex const & x, unsigned diff_param)
+static ex tan_diff(ex const & x, unsigned diff_param)
{
- ASSERT(diff_param==0);
+ GINAC_ASSERT(diff_param==0);
- return (1+power(tan(x),exTWO()));
+ // d/dx tan(x) -> 1+tan(x)^2;
+ return (1+power(tan(x),_ex2()));
}
-REGISTER_FUNCTION(tan, tan_eval, tan_evalf, tan_diff, NULL);
+static ex tan_series(ex const & x, symbol const & s, ex const & point, int order)
+{
+ // method:
+ // Taylor series where there is no pole falls back to tan_diff.
+ // On a pole simply expand sin(x)/cos(x).
+ ex xpoint = x.subs(s==point);
+ if (!(2*xpoint/Pi).info(info_flags::odd))
+ throw do_taylor(); // caught by function::series()
+ // if we got here we have to care for a simple pole
+ return (sin(x)/cos(x)).series(s, point, order+2);
+}
+
+REGISTER_FUNCTION(tan, tan_eval, tan_evalf, tan_diff, tan_series);
//////////
// inverse sine (arc sine)
//////////
-ex asin_evalf(ex const & x)
+static ex asin_evalf(ex const & x)
{
BEGIN_TYPECHECK
TYPECHECK(x,numeric)
return asin(ex_to_numeric(x)); // -> numeric asin(numeric)
}
-ex asin_eval(ex const & x)
+static ex asin_eval(ex const & x)
{
if (x.info(info_flags::numeric)) {
// asin(0) -> 0
if (x.is_zero())
return x;
// asin(1/2) -> Pi/6
- if (x.is_equal(exHALF()))
+ if (x.is_equal(_ex1_2()))
return numeric(1,6)*Pi;
// asin(1) -> Pi/2
- if (x.is_equal(exONE()))
- return numeric(1,2)*Pi;
+ if (x.is_equal(_ex1()))
+ return _num1_2()*Pi;
// asin(-1/2) -> -Pi/6
- if (x.is_equal(exMINUSHALF()))
+ if (x.is_equal(_ex_1_2()))
return numeric(-1,6)*Pi;
// asin(-1) -> -Pi/2
- if (x.is_equal(exMINUSONE()))
- return numeric(-1,2)*Pi;
+ if (x.is_equal(_ex_1()))
+ return _num_1_2()*Pi;
// asin(float) -> float
- if (!x.info(info_flags::rational))
+ if (!x.info(info_flags::crational))
return asin_evalf(x);
}
return asin(x).hold();
}
-ex asin_diff(ex const & x, unsigned diff_param)
+static ex asin_diff(ex const & x, unsigned diff_param)
{
- ASSERT(diff_param==0);
+ GINAC_ASSERT(diff_param==0);
- return power(1-power(x,exTWO()),exMINUSHALF());
+ // d/dx asin(x) -> 1/sqrt(1-x^2)
+ return power(1-power(x,_ex2()),_ex_1_2());
}
REGISTER_FUNCTION(asin, asin_eval, asin_evalf, asin_diff, NULL);
// inverse cosine (arc cosine)
//////////
-ex acos_evalf(ex const & x)
+static ex acos_evalf(ex const & x)
{
BEGIN_TYPECHECK
TYPECHECK(x,numeric)
return acos(ex_to_numeric(x)); // -> numeric acos(numeric)
}
-ex acos_eval(ex const & x)
+static ex acos_eval(ex const & x)
{
if (x.info(info_flags::numeric)) {
// acos(1) -> 0
- if (x.is_equal(exONE()))
- return exZERO();
+ if (x.is_equal(_ex1()))
+ return _ex0();
// acos(1/2) -> Pi/3
- if (x.is_equal(exHALF()))
+ if (x.is_equal(_ex1_2()))
return numeric(1,3)*Pi;
// acos(0) -> Pi/2
if (x.is_zero())
return numeric(1,2)*Pi;
// acos(-1/2) -> 2/3*Pi
- if (x.is_equal(exMINUSHALF()))
+ if (x.is_equal(_ex_1_2()))
return numeric(2,3)*Pi;
// acos(-1) -> Pi
- if (x.is_equal(exMINUSONE()))
+ if (x.is_equal(_ex_1()))
return Pi;
// acos(float) -> float
- if (!x.info(info_flags::rational))
+ if (!x.info(info_flags::crational))
return acos_evalf(x);
}
return acos(x).hold();
}
-ex acos_diff(ex const & x, unsigned diff_param)
+static ex acos_diff(ex const & x, unsigned diff_param)
{
- ASSERT(diff_param==0);
+ GINAC_ASSERT(diff_param==0);
- return numMINUSONE()*power(1-power(x,exTWO()),exMINUSHALF());
+ // d/dx acos(x) -> -1/sqrt(1-x^2)
+ return _ex_1()*power(1-power(x,_ex2()),_ex_1_2());
}
REGISTER_FUNCTION(acos, acos_eval, acos_evalf, acos_diff, NULL);
// inverse tangent (arc tangent)
//////////
-ex atan_evalf(ex const & x)
+static ex atan_evalf(ex const & x)
{
BEGIN_TYPECHECK
TYPECHECK(x,numeric)
return atan(ex_to_numeric(x)); // -> numeric atan(numeric)
}
-ex atan_eval(ex const & x)
+static ex atan_eval(ex const & x)
{
if (x.info(info_flags::numeric)) {
// atan(0) -> 0
- if (x.is_equal(exZERO()))
- return exZERO();
+ if (x.is_equal(_ex0()))
+ return _ex0();
// atan(float) -> float
- if (!x.info(info_flags::rational))
+ if (!x.info(info_flags::crational))
return atan_evalf(x);
}
return atan(x).hold();
}
-ex atan_diff(ex const & x, unsigned diff_param)
+static ex atan_diff(ex const & x, unsigned diff_param)
{
- ASSERT(diff_param==0);
+ GINAC_ASSERT(diff_param==0);
return power(1+x*x, -1);
}
// inverse tangent (atan2(y,x))
//////////
-ex atan2_evalf(ex const & y, ex const & x)
+static ex atan2_evalf(ex const & y, ex const & x)
{
BEGIN_TYPECHECK
TYPECHECK(y,numeric)
return atan(ex_to_numeric(y),ex_to_numeric(x)); // -> numeric atan(numeric)
}
-ex atan2_eval(ex const & y, ex const & x)
+static ex atan2_eval(ex const & y, ex const & x)
{
- if (y.info(info_flags::numeric) && !y.info(info_flags::rational) &&
- x.info(info_flags::numeric) && !x.info(info_flags::rational)) {
+ if (y.info(info_flags::numeric) && !y.info(info_flags::crational) &&
+ x.info(info_flags::numeric) && !x.info(info_flags::crational)) {
return atan2_evalf(y,x);
}
return atan2(y,x).hold();
}
-ex atan2_diff(ex const & y, ex const & x, unsigned diff_param)
+static ex atan2_diff(ex const & y, ex const & x, unsigned diff_param)
{
- ASSERT(diff_param<2);
-
+ GINAC_ASSERT(diff_param<2);
+
if (diff_param==0) {
// d/dy atan(y,x)
- return power(x*(1+y*y/(x*x)),-1);
+ return x*pow(pow(x,2)+pow(y,2),-1);
}
// d/dx atan(y,x)
- return -y*power(x*x+y*y,-1);
+ return -y*pow(pow(x,2)+pow(y,2),-1);
}
REGISTER_FUNCTION(atan2, atan2_eval, atan2_evalf, atan2_diff, NULL);
// hyperbolic sine (trigonometric function)
//////////
-ex sinh_evalf(ex const & x)
+static ex sinh_evalf(ex const & x)
{
BEGIN_TYPECHECK
TYPECHECK(x,numeric)
return sinh(ex_to_numeric(x)); // -> numeric sinh(numeric)
}
-ex sinh_eval(ex const & x)
+static ex sinh_eval(ex const & x)
{
if (x.info(info_flags::numeric)) {
- // sinh(0) -> 0
- if (x.is_zero())
- return exZERO();
- // sinh(float) -> float
- if (!x.info(info_flags::rational))
+ if (x.is_zero()) // sinh(0) -> 0
+ return _ex0();
+ if (!x.info(info_flags::crational)) // sinh(float) -> float
return sinh_evalf(x);
}
+ if ((x/Pi).info(info_flags::numeric) &&
+ ex_to_numeric(x/Pi).real().is_zero()) // sinh(I*x) -> I*sin(x)
+ return I*sin(x/I);
+
if (is_ex_exactly_of_type(x, function)) {
ex t=x.op(0);
// sinh(asinh(x)) -> x
return t;
// sinh(acosh(x)) -> (x-1)^(1/2) * (x+1)^(1/2)
if (is_ex_the_function(x, acosh))
- return power(t-exONE(),exHALF())*power(t+exONE(),exHALF());
+ return power(t-_ex1(),_ex1_2())*power(t+_ex1(),_ex1_2());
// sinh(atanh(x)) -> x*(1-x^2)^(-1/2)
if (is_ex_the_function(x, atanh))
- return t*power(exONE()-power(t,exTWO()),exMINUSHALF());
+ return t*power(_ex1()-power(t,_ex2()),_ex_1_2());
}
return sinh(x).hold();
}
-ex sinh_diff(ex const & x, unsigned diff_param)
+static ex sinh_diff(ex const & x, unsigned diff_param)
{
- ASSERT(diff_param==0);
+ GINAC_ASSERT(diff_param==0);
+ // d/dx sinh(x) -> cosh(x)
return cosh(x);
}
// hyperbolic cosine (trigonometric function)
//////////
-ex cosh_evalf(ex const & x)
+static ex cosh_evalf(ex const & x)
{
BEGIN_TYPECHECK
TYPECHECK(x,numeric)
return cosh(ex_to_numeric(x)); // -> numeric cosh(numeric)
}
-ex cosh_eval(ex const & x)
+static ex cosh_eval(ex const & x)
{
if (x.info(info_flags::numeric)) {
- // cosh(0) -> 1
- if (x.is_zero())
- return exONE();
- // cosh(float) -> float
- if (!x.info(info_flags::rational))
+ if (x.is_zero()) // cosh(0) -> 1
+ return _ex1();
+ if (!x.info(info_flags::crational)) // cosh(float) -> float
return cosh_evalf(x);
}
+ if ((x/Pi).info(info_flags::numeric) &&
+ ex_to_numeric(x/Pi).real().is_zero()) // cosh(I*x) -> cos(x)
+ return cos(x/I);
+
if (is_ex_exactly_of_type(x, function)) {
ex t=x.op(0);
// cosh(acosh(x)) -> x
return t;
// cosh(asinh(x)) -> (1+x^2)^(1/2)
if (is_ex_the_function(x, asinh))
- return power(exONE()+power(t,exTWO()),exHALF());
+ return power(_ex1()+power(t,_ex2()),_ex1_2());
// cosh(atanh(x)) -> (1-x^2)^(-1/2)
if (is_ex_the_function(x, atanh))
- return power(exONE()-power(t,exTWO()),exMINUSHALF());
+ return power(_ex1()-power(t,_ex2()),_ex_1_2());
}
return cosh(x).hold();
}
-ex cosh_diff(ex const & x, unsigned diff_param)
+static ex cosh_diff(ex const & x, unsigned diff_param)
{
- ASSERT(diff_param==0);
+ GINAC_ASSERT(diff_param==0);
+ // d/dx cosh(x) -> sinh(x)
return sinh(x);
}
// hyperbolic tangent (trigonometric function)
//////////
-ex tanh_evalf(ex const & x)
+static ex tanh_evalf(ex const & x)
{
BEGIN_TYPECHECK
TYPECHECK(x,numeric)
return tanh(ex_to_numeric(x)); // -> numeric tanh(numeric)
}
-ex tanh_eval(ex const & x)
+static ex tanh_eval(ex const & x)
{
if (x.info(info_flags::numeric)) {
- // tanh(0) -> 0
- if (x.is_zero())
- return exZERO();
- // tanh(float) -> float
- if (!x.info(info_flags::rational))
+ if (x.is_zero()) // tanh(0) -> 0
+ return _ex0();
+ if (!x.info(info_flags::crational)) // tanh(float) -> float
return tanh_evalf(x);
}
+ if ((x/Pi).info(info_flags::numeric) &&
+ ex_to_numeric(x/Pi).real().is_zero()) // tanh(I*x) -> I*tan(x);
+ return I*tan(x/I);
+
if (is_ex_exactly_of_type(x, function)) {
ex t=x.op(0);
// tanh(atanh(x)) -> x
return t;
// tanh(asinh(x)) -> x*(1+x^2)^(-1/2)
if (is_ex_the_function(x, asinh))
- return t*power(exONE()+power(t,exTWO()),exMINUSHALF());
+ return t*power(_ex1()+power(t,_ex2()),_ex_1_2());
// tanh(acosh(x)) -> (x-1)^(1/2)*(x+1)^(1/2)/x
if (is_ex_the_function(x, acosh))
- return power(t-exONE(),exHALF())*power(t+exONE(),exHALF())*power(t,exMINUSONE());
+ return power(t-_ex1(),_ex1_2())*power(t+_ex1(),_ex1_2())*power(t,_ex_1());
}
return tanh(x).hold();
}
-ex tanh_diff(ex const & x, unsigned diff_param)
+static ex tanh_diff(ex const & x, unsigned diff_param)
{
- ASSERT(diff_param==0);
+ GINAC_ASSERT(diff_param==0);
- return exONE()-power(tanh(x),exTWO());
+ // d/dx tanh(x) -> 1-tanh(x)^2
+ return _ex1()-power(tanh(x),_ex2());
}
-REGISTER_FUNCTION(tanh, tanh_eval, tanh_evalf, tanh_diff, NULL);
+static ex tanh_series(ex const & x, symbol const & s, ex const & point, int order)
+{
+ // method:
+ // Taylor series where there is no pole falls back to tanh_diff.
+ // On a pole simply expand sinh(x)/cosh(x).
+ ex xpoint = x.subs(s==point);
+ if (!(2*I*xpoint/Pi).info(info_flags::odd))
+ throw do_taylor(); // caught by function::series()
+ // if we got here we have to care for a simple pole
+ return (sinh(x)/cosh(x)).series(s, point, order+2);
+}
+
+REGISTER_FUNCTION(tanh, tanh_eval, tanh_evalf, tanh_diff, tanh_series);
//////////
// inverse hyperbolic sine (trigonometric function)
//////////
-ex asinh_evalf(ex const & x)
+static ex asinh_evalf(ex const & x)
{
BEGIN_TYPECHECK
TYPECHECK(x,numeric)
return asinh(ex_to_numeric(x)); // -> numeric asinh(numeric)
}
-ex asinh_eval(ex const & x)
+static ex asinh_eval(ex const & x)
{
if (x.info(info_flags::numeric)) {
// asinh(0) -> 0
if (x.is_zero())
- return exZERO();
+ return _ex0();
// asinh(float) -> float
- if (!x.info(info_flags::rational))
+ if (!x.info(info_flags::crational))
return asinh_evalf(x);
}
return asinh(x).hold();
}
-ex asinh_diff(ex const & x, unsigned diff_param)
+static ex asinh_diff(ex const & x, unsigned diff_param)
{
- ASSERT(diff_param==0);
+ GINAC_ASSERT(diff_param==0);
- return power(1+power(x,exTWO()),exMINUSHALF());
+ // d/dx asinh(x) -> 1/sqrt(1+x^2)
+ return power(1+power(x,_ex2()),_ex_1_2());
}
REGISTER_FUNCTION(asinh, asinh_eval, asinh_evalf, asinh_diff, NULL);
// inverse hyperbolic cosine (trigonometric function)
//////////
-ex acosh_evalf(ex const & x)
+static ex acosh_evalf(ex const & x)
{
BEGIN_TYPECHECK
TYPECHECK(x,numeric)
return acosh(ex_to_numeric(x)); // -> numeric acosh(numeric)
}
-ex acosh_eval(ex const & x)
+static ex acosh_eval(ex const & x)
{
if (x.info(info_flags::numeric)) {
// acosh(0) -> Pi*I/2
if (x.is_zero())
return Pi*I*numeric(1,2);
// acosh(1) -> 0
- if (x.is_equal(exONE()))
- return exZERO();
+ if (x.is_equal(_ex1()))
+ return _ex0();
// acosh(-1) -> Pi*I
- if (x.is_equal(exMINUSONE()))
+ if (x.is_equal(_ex_1()))
return Pi*I;
// acosh(float) -> float
- if (!x.info(info_flags::rational))
+ if (!x.info(info_flags::crational))
return acosh_evalf(x);
}
return acosh(x).hold();
}
-ex acosh_diff(ex const & x, unsigned diff_param)
+static ex acosh_diff(ex const & x, unsigned diff_param)
{
- ASSERT(diff_param==0);
+ GINAC_ASSERT(diff_param==0);
- return power(x-1,exMINUSHALF())*power(x+1,exMINUSHALF());
+ // d/dx acosh(x) -> 1/(sqrt(x-1)*sqrt(x+1))
+ return power(x+_ex_1(),_ex_1_2())*power(x+_ex1(),_ex_1_2());
}
REGISTER_FUNCTION(acosh, acosh_eval, acosh_evalf, acosh_diff, NULL);
// inverse hyperbolic tangent (trigonometric function)
//////////
-ex atanh_evalf(ex const & x)
+static ex atanh_evalf(ex const & x)
{
BEGIN_TYPECHECK
TYPECHECK(x,numeric)
return atanh(ex_to_numeric(x)); // -> numeric atanh(numeric)
}
-ex atanh_eval(ex const & x)
+static ex atanh_eval(ex const & x)
{
if (x.info(info_flags::numeric)) {
// atanh(0) -> 0
if (x.is_zero())
- return exZERO();
+ return _ex0();
// atanh({+|-}1) -> throw
- if (x.is_equal(exONE()) || x.is_equal(exONE()))
+ if (x.is_equal(_ex1()) || x.is_equal(_ex1()))
throw (std::domain_error("atanh_eval(): infinity"));
// atanh(float) -> float
- if (!x.info(info_flags::rational))
+ if (!x.info(info_flags::crational))
return atanh_evalf(x);
}
return atanh(x).hold();
}
-ex atanh_diff(ex const & x, unsigned diff_param)
+static ex atanh_diff(ex const & x, unsigned diff_param)
{
- ASSERT(diff_param==0);
+ GINAC_ASSERT(diff_param==0);
- return power(exONE()-power(x,exTWO()),exMINUSONE());
+ // d/dx atanh(x) -> 1/(1-x^2)
+ return power(_ex1()-power(x,_ex2()),_ex_1());
}
REGISTER_FUNCTION(atanh, atanh_eval, atanh_evalf, atanh_diff, NULL);
+
+#ifndef NO_GINAC_NAMESPACE
+} // namespace GiNaC
+#endif // ndef NO_GINAC_NAMESPACE
git://www.ginac.de / ginac.git / blobdiff