Sollya User's Manual

Name:

printexpansion prints a polynomial in Horner form with its coefficients written as a expansions of double precision numbers

Usage:

printexpansion(polynomial) : function -> void

Parameters:

polynomial represents the polynomial to be printed

Description:

The command printexpansion prints the polynomial polynomial in Horner form writing its coefficients as expansions of double precision numbers. The double precision numbers themselves are displayed in hexadecimal memory notation (see printdouble).

If some of the coefficients of the polynomial polynomial are not floating-point constants but constant expressions, they are evaluated to floating-point constants using the global precision prec. If a rounding occurs in this evaluation, a warning is displayed.

If the exponent range of double precision is not sufficient to display all the mantissa bits of a coefficient, the coefficient is displayed rounded and a warning is displayed.

If the argument polynomial does not a polynomial, nothing but a warning or a newline is displayed. Constants can be displayed using printexpansion since they are polynomials of degree 0.

Example 1:

> printexpansion(roundcoefficients(taylor(exp(x),5,0),[|DD...|]));
0x3ff0000000000000 + x * (0x3ff0000000000000 + x * (0x3fe0000000000000 + x * ((0x3fc5555555555555 + 0x3c65555555555555) + x * ((0x3fa5555555555555 + 0x3c45555555555555) + x * (0x3f81111111111111 + 0x3c01111111111111)))))

Example 2:

> printexpansion(remez(exp(x),5,[-1;1]));
(0x3ff0002eec908ce9 + 0xbc7df99eb225af5b + 0xb8d55834b08b1f18) + x * ((0x3ff0002835917719 + 0x3c6d82c073b25ebf + 0xb902cf062b54b7b6 + 0x35b0000000000000) + x * ((0x3fdff2d7e6a9c5e9 + 0xbc7b09a95b0d520f + 0xb915b639add55731 + 0x35a8000000000000) + x * ((0x3fc54d67338ba09f + 0x3c4867596d0631cf + 0xb8ef0756bdb4af6e) + x * ((0x3fa66c209b825167 + 0x3c45ec5b6655b076 + 0xb8d8c125286400bc) + x * (0x3f81e55425e72ab4 + 0x3c263b25a1bf597b + 0xb8c843e0401dadd0 + 0x3540000000000000)))))

Example 3:

   > verbosity = 1!;
   > prec = 3500!;
   > printexpansion(pi);
   (0x400921fb54442d18 + 0x3ca1a62633145c07 + 0xb92f1976b7ed8fbc + 0x35c4cf98e804177d + 0x32631d89cd9128a5 + 0x2ec0f31c6809bbdf + 0x2b5519b3cd3a431b + 0x27e8158536f92f8a + 0x246ba7f09ab6b6a9 + 0xa0eedd0dbd2544cf + 0x1d779fb1bd1310ba + 0x1a1a637ed6b0bff6 + 0x96aa485fca40908e + 0x933e501295d98169 + 0x8fd160dbee83b4e0 + 0x8c59b6d799ae131c + 0x08f6cf70801f2e28 + 0x05963bf0598da483 + 0x023871574e69a459 + 0x8000000005702db3 + 0x8000000000000000)
   Warning: the expansion is not complete because of the limited exponent range of double precision.
   Warning: rounding occurred while printing.

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