th 2/9/2010
V trong Matlab
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TH 2D
Lnh plot >> plot(x,f(x))
Vi: f(x) - hm s cn v x vect min gi tr ca hm f
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2/9/2010
V d hm plot
V th ca hm y = sin(x)
>> x = 0:pi/100:2*pi; >> y = sin(x); >> plot(x, y)
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2/9/2010
Tham s ng nt c a th
>> plot(x,y,'LinestyleMarkerColor') Linestyle (nt v )
`-' `--` `:' `-.'
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Marker (nh d u nt v ) `+' `o' `*' `.'
`s'/`square' `d'/`diamond' `p'/`pentagram'
+ *
`h'/`hexagram'
^
v
.
> <
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2/9/2010
Color (mu s c) `r' (red) `k'(black) `w'(white) `y'(yellow) `c'(cyan) `b'(blue) `g'(green) `m'(magenta)
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V d v th v i cc tham s
>> x = 0:pi/20:2*pi; >> plot(x, sin(x),'-.*r');
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2/9/2010
L nh hold on
Khi mun v thm th trn th hin c, ta s dng lnh hold on. tt ch ny, s dng hold off. V d
>> >> >> >> >> x = 0:pi/10:2*pi; plot(x, sin(x),'->r') hold on t =0:1:7; plot(t, 2*t,'-*b');
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V d v nhi u th v i cc tham s
>> >> >> >> >> >> x = 0:pi/20:2*pi; plot(x, sin(x),'-.*r'); hold on plot(x, sin(x pi/2),'--om'); plot(x, pi), sin(x `:bs'); hold off
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2/9/2010
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Cc tham s khc
LineWidth : rng ca nt v, tnh bng pt. MarkerEdgecolor: mu ca ng vin marker. MarkerFacecolor: mu bn trong marker. Markersize: ln ca marker, tnh bng pt.
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2/9/2010
V d v th v i cc tham s khc
>> x = -pi:pi/10:pi; >> y = tan(sin(x)) - sin(tan(x)); >> plot(x,y,`--rs','LineWidth',... 2,'MarkerEdgecolor',... 'k','MarkerFacecolor',... 'g', 'MarkerSize',10)
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2/9/2010
Xc nh ki u tr c t a
Lnh axis axis([xmin xmax ymin ymax]) Ty chnh cc kiu trc ta axis on/off/auto axis normal/square/equal/tight axis ij/xy grid on/off
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V d v ki u tr c to
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2/9/2010
Xc nh gi i h n t a
xlim([xmin xmax]) ylim(ymin ymax])
Xc nh gii hn ca trc Ox v Oy. V d
x = linspace(0,3,500); y = 1./(x - 1).^2 + 3./(x - 2).^2; plot(x,y); grid on; ylim([0 50]);
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2/9/2010
Xc nh cc m c ghi trn tr c t a
XTick v YTick
V d
x = -pi:.1:pi; y = sin(x); plot(x,y) set(gca,'XTick',-pi:pi/2:pi) set(gca,'XTickLabel',... {'-pi','-pi/2','0','pi/2','pi'})
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