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set term pngcairo size 1000, 800
set grid lw 2
f1(x) = a1 * x + b1
fit f1(x) 'ex1_EL.plot' yerr via a1, b1
f21(x) = a21 * x + b21
f22(x) = a22*log(x - b22) + c22
fit f21(x) 'ex2_IE.plot' yerr via a21, b21
fit f22(x) 'ex2_UE.plot' via a22, b22, c22
#f31(x) = a31*(x + c31) + exp(b31*(x + c31))
#f32(x) = a32*(x + c32) + exp(b32*(x + c32))
#fit f31(x) 'ex3_1.plot' xyerr via a31, b31, c31
#fit f32(x) 'ex3_2.plot' xyerr via a32, b32, c32
f41(x) = a41*log(x - b41) + c41
f42(x) = a42*x + b42
fit f41(x) 'ex4_UE.plot' yerr via a41, b41, c41
fit f42(x) 'ex4_IE_1.plot' yerr via a42, b42
#f61(x) = log(a61*x + b61) + c61
#f62(x) = x/a62 * exp(-x/a62 + b62)
#fit f61(x) 'ex6_UI.plot' xyerr via a61, b61, c61
#fit f62(x) 'ex6_nuR.plot' xyerr via a62, b62
set linetype 10 dashtype (15, 15) lw 1 lc 0
set linetype 1 lc rgb "red"
set linetype 2 lc rgb "green"
set linetype 3 lc rgb "blue"
set output 'ex1.png'
set title "Зависимость освещённости E от расстояния до источника L^{-2}"
set xlabel "L^{-2}, м^{-2}"
set ylabel "E, лк"
set xrange[0:110]
set yrange[0:3500]
plot 'ex1_EL.plot' using 1:2:3 with yerrorbars notitle lc 0 pt 1 lw 2, \
f1(x) title "МНК" lc rgb "red"
reset
set grid lw 2
set output 'ex2.png'
set title "Зависимосьть I, U фотоида от освещённости E"
set y2tics
set xlabel "E, лк"
set ylabel "U, В"
set y2label "I, А"
set xrange[0:3500]
plot 'ex2_IE.plot' axis x1y2 with lines title "I(E)",\
'ex2_UE.plot' axis x1y1 with lines title "U(E)",\
'ex2_IE.plot' axis x1y2 with yerrorbars notitle,\
'ex2_UE.plot' axis x1y1 with yerrorbars notitle,\
f21(x) axis x1y2 lt 10 notitle, f22(x) axis x1y1 lt 10 notitle
reset
set grid lw 2
set output 'ex3.png'
set term pngcairo size 1272, 900
set title "ВАХ фотоида при разных значениях освещённости"
set xlabel "U, В"
set ylabel "I, А"
set xrange[-11:0.6]
plot 'ex3_1.plot' with lines title "I(U) с засветкой",\
'ex3_2.plot' with lines title "I(U) без засветки",\
'ex3_2.plot' using 1:2:3:4 with xyerrorbars notitle, \
'ex3_1.plot' using 1:2:3:4 with xyerrorbars notitle,\
# f31(x) notitle lt 10, f32(x) notitle lt 10
set title "ВАХ фотоида при разных значениях освещённости (Отрицательная ветка)"
set output 'ex3_left.png'
set yrange[-0.00000255:0.0000025]
replot
set title "ВАХ фотоида при разных значениях освещённости (Положительная ветка)"
set output 'ex3_right.png'
unset yrange
set xrange[0:0.5]
replot
reset
set grid lw 2
set term pngcairo size 1000, 800
set output 'ex4.png'
set title "Зависимосьть I, U фотоида от освещённости E"
set y2tics
set xlabel "E, лк"
set ylabel "U, В"
set y2label "I, А"
set xrange[0:3500]
plot 'ex4_UE.plot' axis x1y1 with lines title "U(E)",\
'ex4_IE_1.plot' axis x1y2 with lines title "I_1(E)",\
'ex4_IE_2.plot' axis x1y2 with lines title "I_2(E)",\
'ex4_IE_1.plot' axis x1y2 with yerrorbars notitle,\
'ex4_IE_2.plot' axis x1y2 with yerrorbars notitle,\
'ex4_UE.plot' axis x1y1 with yerrorbars notitle,\
f41(x) lt 10 notitle , f42(x) axis x1y2 lt 10 notitle
reset
set grid lw 2
set output 'ex6_1.png'
set title "ВАХ Солнечной батареи"
set xlabel "U, В"
set ylabel "I, А"
plot 'ex6_UI.plot' with lines title "I(U)",\
'ex6_UI.plot' notitle with xyerrorbars lt 3,\
# f61(x) lt 10 notitle
set output 'ex6_2.png'
set title "Зависимость КПД Nu от сопротивления R"
set xlabel "Nu, ед."
set ylabel "R, кОм"
plot 'ex6_nuR.plot' with lines title "Nu(R)",\
'ex6_nuR.plot' notitle lt 3,\
# f62(x) notitle lt 10
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