git: 9front

ref: b7448d59bd10ecf0f2b779db5d3c5ae9257b6b6a
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);
}