D.2.3.9 writelist
.................
Procedure from library inout.lib (see inout_lib).

Usage:
writelist(file,name,L); file,name strings (file-name, list-name),
L a list.

Create:
a file with name `file`, write the content of the list L into it and
call the list `name`, keeping the list structure

Return:
no return value

Note:
The syntax of writelist uses and is similar to the syntax of the
write command of Singular which does not manage lists properly.
If (file,name) = ("listfile","L1"), writelist creates (resp.
appends if listfile exists) a file with name listfile and stores
there the list L under the name L1. The Singular command
execute(read("listfile")); assigns the content of L (stored in
listfile) to a list L1.

 On a UNIX system, write(">file",...) overwrites an existing file
`file` while write("file",...) and write(">>file",...) append.

Example:
LIB "inout.lib";
ring r;
ideal i=x,y,z;
list k="Hi",nameof(basering),i,37;
writelist("zumSpass","lustig",k);
read("zumSpass");
==> list lustig;
==>    lustig[1]=
==> Hi;
==>    lustig[2]=
==> r;
==>    lustig[3]=
==> x,y,z;
==>    lustig[4]=
==> 37;
==> 
list L=res(i,0);                    //resolution of the ideal i
writelist("res_list","res-name",L); "";
==> 
read("res_list");
==> list res-name;
==>    res-name[1]=
==> z,y,x;
==>    res-name[2]=
==> -y*gen(1)+z*gen(2),-x*gen(1)+z*gen(3),-x*gen(2)+y*gen(3);
==>    res-name[3]=
==> x*gen(1)-y*gen(2)+z*gen(3);
==> 
// execute(read("res_list")); would create a list with name res-name,
// which is the resolution of i (the same content as L)
system("sh","/bin/rm res_list zumSpass");
==> 0
// Under UNIX, this removes the files 'res_list' and 'zumSpass'
// Type help system; to get more information about the shell escape
// If your operating system does not accept the shell escape, you
// must remove the just created files 'zumSpass' and 'res_list' directly

<font size="-1">
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; User manual for <a href="http://www.singular.uni-kl.de/"><i>Singular</i></a> version 2-0-4, October 2002,
generated by <a href="http://www.gnu.org/software/texinfo/"><i>texi2html</i></a>.
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