例4.1 有一組實(shí)驗數據如下表所示：
| 時(shí)間 | 數據1 | 數據2 | 數據3 |
| 1 | 12.51 | 9.87 | 10.11 |
| 2 | 13.54 | 20.54 | 8.14 |
| 3 | 15.60 | 32.21 | 14.17 |
| 4 | 15.92 | 40.50 | 10.14 |
| 5 | 20.64 | 48.31 | 40.50 |
| 6 | 24.53 | 64.51 | 39.45 |
| 7 | 30.24 | 72.32 | 60.11 |
| 8 | 50.00 | 85.98 | 70.13 |
| 9 | 36.34 | 89.77 | 40.90 |
>>clear;
>>t=1:9;
>>d1=[12.51 13.54 15.60 15.92 20.64 24.53 30.24 50.00 36.34];
>>d2=[9.87 20.54 32.21 40.50 48.31 64.51 72.32 85.98 89.77];
>>d3=[10.11 8.14 14.17 10.14 40.50 39.45 60.11 70.13 40.90];
>>plot(t,d1,’r.-’,t,d2,’gx:’,t,d3,’m*-.’);
>>title(‘time&data’);
>>xlabel(‘time’);
>>ylabel(‘data’);
>>axis([0 10 0 100]);
>>text(6.5,25.5,’\leftarrowdata1’);
>>text(3,43.8,’data2\rightarrow’);
>>text(4.8,30.5,’\leftarrowdata3’);
圖4-21 例4.1結果
例4.2 畫(huà)出由函數
形成的立體圖
>>clear;
>>x=-2:0.2:2;
>>y=-2:0.2:2;
>>[xx,yy]=meshgrid(x, y);
>>zz=xx.*exp(-xx.^2-yy.^2);
>>surf(xx, yy, zz);
圖4-21 例4.2結果
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