03 Графики в MATLAB_2
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Example 5: |
x = cos(t), y = cos(t)2 , z = sin (t), u = sin(t)2 , v = esin(t), |
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w = ecos(t) |
>>t = -6.28:0.05:6.28; x = cos(t);
y = cos(t).^2; z = sin(t);
u = sin(t).^2;
v = exp(sin(t)); w = exp(cos(t));
% 6
%
subplot(3,2,1);
plot(t,x); grid on;
title('Graph of function {\it x =cos(t)}'); xlabel('t');
ylabel('x');
>>%
>>subplot(3,2,2)
>>plot(t,y);
>>grid on;
>>title('{\bf y=cos(t)^2}');
>>xlabel('t');
>>ylabel('y');
>>subplot(3,2,3);
>>plot(t,z);
>>grid on;
>>title('{\bf z=sin(t)}');
>>xlabel('t');
>>ylabel('z');
>>subplot(3,2,4);
>>plot(t,u);
>>grid on;
>>title('{\bf u=sin(t)^2}');
>>xlabel('t');
>>ylabel('u');
>>subplot(3,2,5);
>>plot(t,v);
>>grid on;
>>title('{\bf v=exp(sin(t))}');
>>xlabel('t');
>>ylabel('v');
>>subplot(3,2,6);
>>plot(t,w);
>>grid on;
>>title('{\bf w=exp(cos(t))}');
>>xlabel('t');
>>ylabel('w');
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Scatter(x,y)
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0.02 |
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1.2 |
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Scatter(x,y) |
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2.5 |
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3.6 |
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3.8 |
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4.2 |
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5.1 |
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6.2 |
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6.5 |
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6.9 |
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8.9 |
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11.2 |
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12.1 |
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13.0 |
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13.2 |
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13.3 |
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13.6 |
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15.6 |
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16.0 |
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17.2 |
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17.8 |
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18.6 |
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polyfit ( x, y, n); находить подходяший полином n-того порядка и его Коэффициенты в количестве (n+1), который наилчушим образом проходит через данные точки.
polyval( y, x); находить соответствущие на х, значение ординат, используя предварительно определенный полином.
>>x = [0.02 1.2 2.5 3.6 3.8 4.2 5.1 6.2 6.5 6.9 8.9 11.2 12.1 13.0 13.2 13.3 13.6 15.6 16.0 17.2 17.8 18.6];
>>y = [12 13 15 19 22 26 33 42 49 55 66 74 82 95 102 109 112 118 119 123 131 133];
>>scatter(x,y); %
>>p = polyfit(x,y,3); % 3
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>>z = polyval(p,x); %
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>>hold on
>>plot(x,z); %
z
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MATLAB
!" # $% & &, z = f(x,y), ';
2.z !
3." #
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" (x,y)
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$# meshgrid()
•% , #
# meshgrid
>>x=-3.5:3.5;
>>y=-2.5:2.5;
>>[xx,yy]=meshgrid(x,y)
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(i, j), !
# ,
yy ! :
xx(3,1) = -3.5 yy(3,1) = -0.5
& , (x,y) = (-3.5, -0.5)
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' z=f(x,y)
>>x=-3:3;
>>y=-3:3;
>> [xx,yy]=meshgrid(x,y) |
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>> zz=xx.^2 + yy.^2; |
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, * ) * |
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>> mesh(xx,yy,zz) |
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% * (+ % '$ * , |
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& % z,
( ) ,( |
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>>x=-3:0.1:3;
>>y=-3:0.1:3;
>>[xx,yy]=meshgrid(x,y);
>>zz=xx.^2 + yy.^2;
>>mesh(xx,yy,zz)
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>>x=-3:0.1:3;
>>y=-3:0.1:3;
>>[xx,yy]=meshgrid(x,y);
>>zz=xx.^2 + yy.^2;
>>mesh(xx,yy,zz)
axis tight box on view(120,30)
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