北理工_數(shù)據(jù)分析_實驗3_Matlab數(shù)據(jù)處理

1、(封皮頁)理工大學現(xiàn)代數(shù)據(jù)分析實驗3實驗報告主講：明學生：經(jīng)2012/10/24(目錄頁)實驗3數(shù)據(jù)處理113.1實驗目的13.1.1進一步熟悉Matlab數(shù)據(jù)處理基本功能。13.2實驗容13.2.1成績評估13.2.2曲線作圖13.3實驗代碼及結(jié)果13.3.1成績評估13.3.2曲線作圖4(圖表頁) 圖1.y1,y2,y3,y6曲線圖5圖2.y4,y5曲線圖6圖3.y7,y8曲線圖6 實驗3 數(shù)據(jù)處理13.1 實驗目的3.1.1 進一步熟悉Matlab數(shù)據(jù)處理基本功能。3.2 實驗容3.2.1 成績評估某班5名學生，5門課程，生成學生成績并進行統(tǒng)計： 單人/單科（平均分，總分，標準差），全班

2、學生優(yōu)良率統(tǒng)計。課1課2課3課4課5總分平均標準差優(yōu)良率學生1學生2學生3學生4學生5平均標準差優(yōu)良率3.2.2 曲線作圖作出如下曲線，sin(x), sin(3x), sin(x)+sin(3x), x2,x3,1/x,log2(x),log10(x)含多曲線合成圖，多子圖合成圖，用title命令、label命令和axis命令對圖形進行規(guī)化。3.3 實驗代碼及結(jié)果3.3.1 成績評估代碼：score=floor(rand(5,5)*40+60)%生成成績，8人，6門/人sumLie=sum(score)%列求和sumHang=sum(score')%轉(zhuǎn)置后利用列求和命令，實現(xiàn)行求和m

3、eanLie=mean(score)%列平均meanHang=mean(score')%行平均a=meanHang'%meanHang由列轉(zhuǎn)置為行stdLie=std(score)%列標準差stdHang=std(score') %行標準差youliang=score>=80 %生成優(yōu)良矩陣youliangHang=sum(youliang') %優(yōu)良矩陣的行求和youlianglvHang=sum(youliang')/5 %優(yōu)良門次除以總門次得優(yōu)良率youliangLie=sum(youliang) %優(yōu)良矩陣的行求和youlianglvLie

4、=sum(youliang)/5 %優(yōu)良人次除以總?cè)藬?shù)得優(yōu)良率結(jié)果：score = 69 97 71 64 88 83 73 75 77 71 80 76 80 78 70 78 72 88 60 88 81 76 72 86 91sumLie = 391 394 386 365 408sumHang = 389 379 384 386 406meanLie = 78.2000 78.8000 77.2000 73.0000 81.6000meanHang = 77.8000 75.8000 76.8000 77.2000 81.2000a = 77.8000 75.8000 76.8000

5、77.2000 81.2000stdLie = 5.4498 10.3296 6.9785 10.7238 10.2127stdHang = 14.0250 4.6043 4.1473 11.7983 7.5961youliang = 0 1 0 0 1 1 0 0 0 0 1 0 1 0 0 0 0 1 0 1 1 0 0 1 1youliangHang = 2 1 2 2 3youlianglvHang = 0.4000 0.2000 0.4000 0.4000 0.6000youliangLie = 3 1 2 1 3youlianglvLie =0.6000 0.2000 0.4000

6、 0.2000 0.6000課1課2課3課4課5總分平均標準差優(yōu)良率學生1699771648838977.814.0250.4學生2837375777137975.84.60430.2學生3807680787038476.84.14730.4學生4787288608838677.211.7980.4學生5817672869140681.27.59610.6平均78.278.877.27381.6標準差5.449810.336.978510.72410.213優(yōu)良率0.60.20.40.20.63.3.2 曲線作圖代碼：x=-100:100;y1=sin(x);y2=sin(3*x);y3=si

7、n(x)+sin(3*x);y4=power(x,2);y5=power(x,3);y6=1./x;y7=log2(x);y8=log10(x);subplot(2,2,1), plot(x,y1,'r-');title('y1=sin(x)');axis(0 100 -1 1);subplot(2,2,2), plot(x,y2,'g-');title('y2=sin(3*x)');axis(0 100 -1 1);subplot(2,2,3), plot(x,y3,'b-');title('y3=sin(x)+sin(3*x)');axis(0 100 -2 2);subplot(2,2,4), plot(x,y6,'r-');title('y6=1./x');figure(2);plotyy(x,y4,x,y5);title('y4=x2 and y5=x3');xlabel('x');ylabel('y');figure(3);plotyy(x,y7,x,y8);title('y7=lo