plot , .
1. sin 2 0,01.
>> x=0:0.01:2;
y=sin(x);
plot(x,y)
Figure 1 Edit→Copy Figure (. 11).
. 11
2. sin 2π.
>> x=0: pi/10: 2*pi;
y=sin(x); y2=0.6*sin(x-0.25); y3=0.8*sin(x-0.5);
plot(x,y, x,y2, 'b:*', x,y3, 'm:+')
plot + * (. 12).
12
3. .
>> x=0: 0.01: 2;
>> y1=sin(x); y2=cos(x);
>> plot(x,y1)
>> hold on
>> subplot(1,2,1);
>> plot(x,y1)
>> subplot(1,2,2);
>> plot(x,y2)
. 13
4. .
:
1. .
2. .
3. .
.
>> [X,Y]=meshgrid(-1: 0.05: 1, 0: 0.05: 1);
>> Z=4*sin(2*pi*X).*cos(1.5*pi*Y).*(1-X.^2).*Y.*(1-Y);
>> mesh(X,Y,Z);
>> surf(X,Y,Z); colorbar
surf . , colorbar.
. 14
3
, ,
, M -, :
1. M - ( F5).
2. M -, M -.
. , , M - . fun2. .
1. . 13 M - graf1.m.
>>x=1: pi/10: 3*pi; graf1(x) (. 15).
function y=graf1(x)
y=sin(x);
y2=0.6*sin(x-0.25);
y3=0.8*sin(x-0.5);
plot(x,y, x,y2, 'b:*', x,y3, 'm:+')
. 15
2. . 12 M - graf.m. :
function y=graf(x)
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
x. x=-3: 0.1: 2.5; graf(x) (. 15).
. 15
4