Sollya User's Manual

Name:

display sets or inspects the global variable specifying number notation

Library names:

void sollya_lib_set_display_and_print(sollya_obj_t) void sollya_lib_set_display(sollya_obj_t) sollya_obj_t sollya_lib_get_display()

Usage:

Parameters:

notation value represents a variable of type decimal|binary|dyadic|powers|hexadecimal

Description:

An assignment display = notation value, where notation value is one of decimal, dyadic, powers, binary or hexadecimal, activates the corresponding notation for output of values in print, write or at the Sollya prompt.

If the global notation variable display is decimal, all numbers will be output in scientific decimal notation. If the global notation variable display is dyadic, all numbers will be output as dyadic numbers with Gappa notation. If the global notation variable display is powers, all numbers will be output as dyadic numbers with a notation compatible with Maple and PARI/GP. If the global notation variable display is binary, all numbers will be output in binary notation. If the global notation variable display is hexadecimal, all numbers will be output in C99/ IEEE754-2008 notation. All output notations can be parsed back by Sollya, inducing no error if the input and output precisions are the same (see prec).

If the assignment display = notation value is followed by an exclamation mark, no message indicating the new state is displayed. Otherwise the user is informed of the new state of the global mode by an indication.

Example 1:

   > display = decimal;
   Display mode is decimal numbers.
   > a = evaluate(sin(pi * x), 0.25);
   > a;
   0.70710678118654752440084436210484903928483593768847
   > display = binary;
   Display mode is binary numbers.
   > a;
   1.01101010000010011110011001100111111100111011110011001001000010001011001011111011000100110110011011101010100101010111110100111110001110101101111011000001011101010001_2 * 2^(-1)
   > display = hexadecimal;
   Display mode is hexadecimal numbers.
   > a;
   0x1.6a09e667f3bcc908b2fb1366ea957d3e3adec1751p-1
   > display = dyadic;
   Display mode is dyadic numbers.
   > a;
   33070006991101558613323983488220944360067107133265b-165
   > display = powers;
   Display mode is dyadic numbers in integer-power-of-2 notation.
   > a;
   33070006991101558613323983488220944360067107133265 * 2^(-165)

See also: print, write, decimal, dyadic, powers, binary, hexadecimal, prec

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