git: 9front

ref: 3debe91f3d1dd8a49ec2de5927e46e28ae9e7aad
dir: /sys/src/cmd/plot/libplot/rvec.c/

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#include "mplot.h"
void rvec(double xx, double yy){
	e1->copyx += xx;
	e1->copyy += yy;
	vec(e1->copyx, e1->copyy);
}