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MATLAB
2008
32.973.26.-018.2
12
. MATLAB: 190100.62 230103 ( ) / .. . : , 2008. 31 .
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>> a=2
a =
>> b=4;
>> =a+b
=
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load save.
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>> save
Saving to: matlab.mat
>> load
Loading from: matlab.mat
>> save my.mat
>> load my.mat
>> save my2
>> load my2
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File MatLab New M-file. M - (. 10). -
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a b, fun1.m. , .
| >> a = 7.5; b = 3.342; c = (a+b)/2 c = 5.4210 | >> fun1 c = 5.4210 |
. Figure. fun2.m. >> fun2 Figure (. 11).
| fun2.m |
| x=[0: 0.1: 7]; f=exp(-x); subplot(1, 2, 1) plot(x, f) g=sin(x); subplot(1, 2, 2) plot(x, g) |
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>> D=sqrt(A(2))+2*B(1)
D =
4.8284
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| : 1) , 2) plot. | >> x=0:0.01:2; >> y=sin(x); >> plot(x,y) |
| : hold on plot(x1,y1,x2,y2,,xn,yn). | >> x=0:0.01:2; >> y1=sin(x); y2=cos(x); >> plot(x,y1) >> hold on >> plot(x,y2) >> plot(x,y1,x,y2) |
| n : subplot (< >, < >, < >) lot. | <> >> subplot(1,2,1); >> plot(x1,y1) >> subplot(1,2,2); >> plot(x2,y2) <> |
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>> plot(x,y,'o') %
>> plot(x,y,'r+-') % -
>> plot(x,y,'+r-') %
>> plot(x,y,'r-',x,y,'ko')
>> plot(x1,y1,'b',x2,y2,'k+')
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>> x=0:0.1:3;
>> y=sin(x);
>> hPlot=plot(x,y);
>> get(hPlot)
Color = [0 0 1]
EraseMode = normal
LineStyle = -
LineWidth = [0.5]
Marker = none
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>> hAxes=gca;
>> set (hAxes,'xtick',[1.5 1.75 2.0 2.25 2.5])
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xlabel, ylabel, title text. xlabel , label - .
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title ('some text'), TeX.
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>> hAxes=gca;
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, , : axis([xmin xmax ymin ymax zmin zmax]), text, xlabel, ylabel, zlabel ..
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mesh, surf surfl, az=-37.5º, el=30º. view([az,el]), .
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Symbolic Math Toolbox. L , , .
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Symbolic Math lb - digits vpa. , . vpa Variable Precision Arithmetic, .
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>> digits(30); vpa(pi)
ans = 3.14159265358979323846264338328
- 
30 , ans sym object. Symbolic Math lb .
y1=y; s2=['n=' num2str(n)]; hText=text(1.5, 1.5^2*n-1, s2); set(hText,'FontSize',[14]); end
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) , Figure , , . num2str(x), x :
>> x=-2:0.1:2;
title('{\itf(x)=x^{n}}');
xlabel('x');
ylabel('y');
hFigure=gcf;
set(hFigure,'Color',[1 1 1]);
hText=text;
set(hText,'FontSize',[18]);
for n=2:4
y=x.^n;
hold on
hPlot=plot(x,y);
set(hPlot,'Color',[1.8/n 0.7 0.5]);
set(hPlot,'LineWidth',2);
if n~=2
for i=1:length(y)
s='';
if y(i)==y1(i)
hold on
plot(x(i),y(i),'ko');
s=['(' num2str(x(i)) ',' num2str(y(i)) ')'];
hText=text(x(i),y(i)+2, s); set(hText,'FontSize',[16]);
end
end
end
y1=y; s2=['n=' num2str(n)];
hText=text(1.5, 1.5^2*n-1, s2); set(hText,'FontSize',[14]);
end
. 12
1
MATLAB , , .
1. Enter MATLAB , , . ; (-).
>> a=2
a =
>> b=4;
>> =a+b
=
, MATLAB , .
2. :
>> r =(1+sqrt(5))/2
r =
1.6180
3. (2,4):
>> Z=zeros(2,4)
Z =
0 0 0 0
0 0 0 0
4. . .
>> A=[1 2 3;4 5 6;7 8 9]
A =
1 2 3
4 5 6
7 8 9
5. :
>> A.^2
ans =
1 4 9
16 25 36
49 64 81
6. :
>> A=[1 2 3;4 5 6;7 8 9]; B=2*A; C=A+B
C =
3 6 9
12 15 18
21 24 27
7. , cos :
>> cos(C)
ans =
-0.9900 0.9602 -0.9111
0.8439 -0.7597 0.6603
-0.5477 0.4242 -0.2921
8. :
>> x=2;y=(sin(2*x)-tan(7.8*x^2)/cos(3*x^4))*exp(-2*x)
y =
-0.0201
2
