(封皮页)北京理工大学现代数据分析实验3实验报告主讲：李明学生：李经2012/10/24(目录页)实验3数据处理1...................................................................................................13.1实验目的......................................................................................................13.1.1进一步熟悉Matlab数据处理基本功能。.......................................13.2实验内容......................................................................................................13.2.1成绩评估............................................................................................13.2.2曲线作图............................................................................................13.3实验代码及结果..........................................................................................13.3.1成绩评估............................................................................................13.3.2曲线作图............................................................................................4(图表页)图1.y1,y2,y3,y6曲线图........................................................................................5图2.y4,y5曲线图..................................................................................................6图3.y7,y8曲线图..................................................................................................6I实验3数据处理13.1实验目的3.1.1进一步熟悉Matlab数据处理基本功能。3.2实验内容3.2.1成绩评估某班5名学生，5门课程，生成学生成绩并进行统计：单人/单科（平均分，总分，标准差），全班学生优良率统计。姓名课1课2课3课4课5总分平均标准差优良率学生1学生2学生3学生4学生5平均标准差优良率3.2.2曲线作图作出如下曲线，sin(x),sin(3x),sin(x)+sin(3x),x2,x3,1/x,log2(x),log10(x)含多曲线合成图，多子图合成图，用title命令、label命令和axis命令对图形进行规范化。3.3实验代码及结果3.3.1成绩评估代码：score=floor(rand(5,5)*40+60)%生成成绩，8人，6门/人sumLie=sum(score)%列求和sumHang=sum(score')%转置后利用列求和命令，实现行求和meanLie=mean(score)%列平均meanHang=mean(score')%行平均a=meanHang'%meanHang由列转置为行stdLie=std(score)%列标准差stdHang=std(score')%行标准差1youliang=score>=80%生成优良矩阵youliangHang=sum(youliang')%优良矩阵的行求和youlianglvHang=sum(youliang')/5%优良门次除以总门次得优良率youliangLie=sum(youliang)%优良矩阵的行求和youlianglvLie=sum(youliang)/5%优良人次除以总人数得优良率结果：score=69977164888373757771807680787078728860888176728691sumLie=391394386365408sumHang=389379384386406meanLie=78.200078.800077.200073.000081.6000meanHang=77.800075.800076.800077.200081.2000a=277.800075.800076.800077.200081.2000stdLie=5.449810.32966.978510.723810.2127stdHang=14.02504.60434.147311.79837.5961youliang=0100110000101000010110011youliangHang=21223youlianglvHang=0.40000.20000.40000.40000.60003youliangLie=31213youlianglvLie=0.60000.20000.40000.20000.6000姓名课1课2课3课4课5总分平均标准差优良率学生1699771648838977.814.0250.4学生2837375777137975.84.60430.2学生3807680787038476.84.14730.4学生4787288608838677.211.7980.4学生5817672869140681.27.59610.6平均78.278.877.27381.6标准差5.449810.336.978510.72410.213优良率0.60.20.40.20.63.3.2曲线作图代码：x=-100:100;y1=sin(x);y2=sin(3*x);y3=sin(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([0100-11]);subplot(2,2,2),plot(x,y2,'g-');title('y2=sin(3*x)');axis([0100-11]);4subplot(2,2,3),plot(x,y3,'b-');title('y3=sin(x)+sin(3*x)');axis([0100-22]);subplot(2,2,4),plot(x,y6,'r-');title('y6=1./x');figure(2);plotyy(x,y4,x,y5);title('y4=x^2andy5=x^3');xlabel('x');ylabel('y');figure(3);plotyy(x,y7,x,y8);title('y7=log2(x)andy8=log10(x)');xlabel('x');ylabel('y');axisauto;结果：0102030405060708090100-1-0.500.51y1=sin(x)0102030405060708090100-1-0.500.51y2=sin(3*x)0102030405060708090100-2-1012y3=sin(x)+sin(3*x)-100-80-60-40-20020406080100-1-0.500.51y6=1./x图1.y1,y2,y3,y6曲线图5-100-80-60-40-200204060801000500010000y4=x2andy5=x3xy-100-80-60-40-20020406080100-101x106图2.y4,y5曲线图-100-80-60-40-2002040608010002468y7=log2(x)andy8=log10(x)xy-100-80-60-40-2002040608010000.511.52图3.y7,y8曲线图6
