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5.1.146 sprintf

Procedure from library standard.lib (see standard_lib).

Syntax:
sprintf ( string_expression [, any_expressions ] )

Return:
string

Purpose:
sprintf(fmt,...); performs output formatting. The first argument is a format control string. Additional arguments may be required, depending on the content of the control string. A series of output characters is generated as directed by the control string; these characters are returned as a string.
The control string fmt is simply text to be copied, except that the string may contain conversion specifications.
Type help print; for a listing of valid conversion specifications. As an addition to the conversions of print, the %n and %2 conversion specification does not consume an additional argument, but simply generates a newline character.

Note:
If one of the additional arguments is a list, then it should be wrapped in an additional list() command, since passing a list as an argument flattens the list by one level.

Example:
 
  ring r=0,(x,y,z),dp;
module m=[1,y],[0,x+z];
intmat M=betti(mres(m,0));
list l = r, m, M;
string s = sprintf("s:%s,%n l:%l", 1, 2); s;
==> s:1,
==>  l:int(2)
s = sprintf("s:%n%s", l); s;
==> s:
==> (QQ),(x,y,z),(dp(3),C)
s = sprintf("s:%2%s", list(l)); s;
==> s:
==> (QQ),(x,y,z),(dp(3),C),y*gen(2)+gen(1),x*gen(2)+z*gen(2),1,1 
s = sprintf("2l:%n%2l", list(l)); s;
==> 2l:
==> list("(QQ),(x,y,z),(dp(3),C)",
==> module(y*gen(2)+gen(1),
==> x*gen(2)+z*gen(2)),
==> intmat(intvec(1,1 ),1,2))
==> 
s = sprintf("%p", list(l)); s;
==> [1]:
==>    // coefficients: QQ
==> // number of vars : 3
==> //        block   1 : ordering dp
==> //                  : names    x y z
==> //        block   2 : ordering C
==> [2]:
==>    _[1]=y*gen(2)+gen(1)
==>    _[2]=x*gen(2)+z*gen(2)
==> [3]:
==>    1,1 
s = sprintf("%;", list(l)); s;
==> [1]:
==>    // coefficients: QQ
==> // number of vars : 3
==> //        block   1 : ordering dp
==> //                  : names    x y z
==> //        block   2 : ordering C
==> [2]:
==>    _[1]=y*gen(2)+gen(1)
==>    _[2]=x*gen(2)+z*gen(2)
==> [3]:
==>    1,1 
==> 
s = sprintf("%b", M); s;
==>            0     1
==> ------------------
==>     0:     1     1
==> ------------------
==> total:     1     1
==> 
See also: fprintf; print; printf; string.


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