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1.编制一个脚本，查找给定字符串中指定字符出现的次数和位置；str=['hopes,dreams,holdup,holdup'];findstr(str,'o')%位置ans=21523a=findstr(str,'o');n=length(a)%次数n=32．编写一个脚本，判断输入字符串中每个单词的首字母是否为大写，若不是则将其修改为大写，其他字母为小写。str='ihaveadreamcometrue';nlength=length(str);fork=1:nlengthif(k==1||isspace(str(k-1)))&&(str(k)='z'&&str(k)='a')str(k)=char(double(str(k))-32);endenddisp(str);IHaveADreamComeTrue3．创建2×2单元数组，第1、2个元素为字符串，第三个元素为整型变量，第四个元素为双精度（double）类型，并将其用图形表示。A=cell(2,2)A(1,1)={'beijing'};A(2,1)={'BEIJING'};A(1,2)={uint8(5)};A(2,2)={[1,2;4,7]}cellplot(A)A=[][][][]A='beijing'[5]'BEIJING'[2x2double]4．创建一个结构体，用于统计学生的情况，包括学生的姓名、学号、各科成绩等。然后使用该结构体对一个班级的学生成绩进行管理，如计算总分、平均分、排列名次等。student=struct('name',{'bam','mark','jimin'},'number',{1,2,3},'scores',{[75,89,82],[93,78,90],[85,62,77]},'subject',{'english,math,chinese','english,math,chinese','english,math,chinese'})student=1x3structarraywithfields:namenumberscoressubjectstudent(1)ans=name:'bam'number:1scores:[758982]subject:'english,math,chinese'student(2)ans=name:'mark'number:2scores:[937890]subject:'english,math,chinese'student(3)ans=name:'jimin'number:3scores:[856277]subject:'english,math,chinese'sum(student(1).scores)ans=246sum(student(2).scores)ans=261sum(student(3).scores)ans=224mean(student(1).scores)ans=82mean(student(2).scores)ans=87mean(student(3).scores)ans=74.6667[new,index]=sort([student.scores],'descend')new=939089858278777562index=462735918student(1).mean=mean(student(1).scores)student(2).mean=mean(student(2).scores)student(3).mean=mean(student(3).scores)student=1x3structarraywithfields:namenumberscoressubjectmeanstudent=1x3structarraywithfields:namenumberscoressubjectmeanstudent=1x3structarraywithfields:namenumberscoressubjectmeanstudent(1)ans=name:'bam'number:1scores:[758982]subject:'english,math,chinese'mean:82student(2)ans=name:'mark'number:2scores:[937890]subject:'english,math,chinese'mean:87student(3)ans=name:'jimin'number:3scores:[856277]subject:'english,math,chinese'mean:74.6667[new,index]=sort([student.mean],'descend')new=87.000082.000074.6667index=213