5.1.102 quote

Syntax:

quote ( expression )

Type:

none

Purpose:

prevents expressions from evaluation. Used only in connections with write to MPfile links, prevents evaluation of an expression before sending it to an other SINGULAR process. Within a quoted expression, the quote can be "undone" by an eval (i.e., each eval "undoes" the effect of exactly one quote).

Example:

link l="MPfile:w example.mp"; ring r=0,(x,y,z),ds; ideal i=maxideal(3); ideal j=x7,x2,z; option(prot); // compute i+j before writing, but not std write (l, quote(std(eval(i+j)))); close(l); // now read it in again and evaluate: read(l); → [1023:1]1(12)s2(11)s3(10)--s(7)s(6)-----7- → product criterion:4 chain criterion:0 → _[1]=z → _[2]=x2 → _[3]=xy2 → _[4]=y3 close(l);

See MPfile links; eval; write.