北理工-數(shù)據(jù)分析-實驗3-Matlab數(shù)據(jù)處理

1、北理工-數(shù)據(jù)分析-實驗3-Matlab數(shù)據(jù)處理（封皮頁）北京理工大學(xué)現(xiàn)代數(shù)據(jù)分析實驗3實驗報告主講：李明學(xué)生：李經(jīng)2012/10/24（目錄頁）實驗3 數(shù)據(jù)處理11.3.1 實驗?zāi)康?3.1.1 進(jìn)一步熟悉 Matlab 數(shù)據(jù)處理基本功能。3.2 實驗內(nèi)容13.2.1 成績評估13.2.2 曲線作圖13.儂驗 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 7.I實驗3數(shù)據(jù)處理13.1 實驗?zāi)康?.1.1 進(jìn)一步熟悉Matlab數(shù)據(jù)處理基本功能3.2 實驗內(nèi)容3.2.1 成績

2、評估某班5名學(xué)生，5門課程，生成學(xué)生成績并進(jìn)行統(tǒng)計：單人/單科(平均分,總分，標(biāo)準(zhǔn)差)，全班學(xué)生優(yōu)良率統(tǒng)計。姓名課1課2課3課4課5總分平均標(biāo)準(zhǔn)差優(yōu)良率學(xué)生1學(xué)生2學(xué)生3學(xué)生4學(xué)生5平均標(biāo)準(zhǔn)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), x 2,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(jìn)行規(guī)范化。3.3 實驗代碼及結(jié)果3.3.1 成績評估代碼：%生成成績，8人，6門/人%列求和%轉(zhuǎn)置后利用列求和命令，實現(xiàn)行求和%列平均%行平均%meanHang

3、由列轉(zhuǎn)置為行%列標(biāo)準(zhǔn)差score=floor(rand(5,5)*40+60) sumLie=sum(score) sumHang=sum(score') meanLie=mean(score) meanHang=mean(score') a=meanHang' stdLie=std(score)% 行標(biāo)準(zhǔn)差% 生成優(yōu)良矩陣% 優(yōu)良矩陣的行求和% 優(yōu)良門次除以總門次得優(yōu)良率% 優(yōu)良矩陣的行求和% 優(yōu)良人次除以總?cè)藬?shù)得優(yōu)良率stdHang=std(score') youliang=score>=80 youliangHang=sum(youliang'

4、;) youlianglvHang=sum(youliang')/5 youliangLie=sum(youliang) youlianglvLie=sum(youliang)/5結(jié)果：score =69977164888373757771807680787078728860888176728691sumLie =391394386 365408sumHang =389379384 386406meanLie =78.200078.800077.200073.000081.6000meanHang =77.800075.800076.800077.200081.200077.80007

5、5.800076.800077.200081.2000stdLie =5.449810.32966.978510.723810.2127stdHang =14.02504.60434.147311.79837.5961youliang =0100110000101000010110011youliangHang =21223youlianglvHang =0.40000.20000.40000.40000.6000youliangLie =31213youlianglvLie =0.60000.20000.40000.20000.6000姓名課1課2課3課4課5總分平均標(biāo)準(zhǔn)差優(yōu)良率學(xué)生1699

6、771648838977.814.0250.4學(xué)生2837375777137975.84.60430.2學(xué)生3807680787038476.84.14730.4學(xué)生4787288608838677.211.7980.4學(xué)生5817672869140681.27.59610.6平均78.278.877.27381.6標(biāo)準(zhǔn)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=sin(x)+sin(3*x);y4=power(x,2);y5=power(x,3

7、);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=xA2 and y5=xA3');xlabel('x');ylabel('y');figure(3);plotyy(x,y7,x,y8);title('y7=log2(x) and y8=log10(x)');xlabel('x');ylabel('y');axis auto;結(jié)果:70102030