plot.svg: out.txt Makefile
	echo '\
	set term svg background rgb "white";\
	set out "$@";\
	set xlabel "x";\
	set ylabel "y";\
	set title "least-squares fit of F(x)=c_0/x+c_1+c_2*x to some data" ;\
	plot "$<" index 0 with errorbars title "data"\
	,"$<" index 1 using 1:2 with lines title "F(x)"\
	,"$<" index 1 using 1:3 with lines title "F(x)+dF(x)"\
	,"$<" index 1 using 1:4 with lines title "F(x)-dF(x)"\
	'|gnuplot

out.txt: main.py lsfit.py ../matrix/matrix.py
	python3 $< 1> $@ 2> log

clean:; rm -rf out.* __pycache__ plot* log*