matlab中helpinv,MATLAB作业

0 1 0 0 0 0 0

isinf(A)

ans &＃61;

0 0 1 1 0 0 0

isfinite(A)

ans &＃61;

1 0 0 0 1 1 1

7、用结构体矩阵来存储5名学生的基本情况数据&＃xff0c;每名学生的数据包括学号、姓名专业和6门课程的成绩。

答&＃xff1a;程序设计&＃xff1a;

student(1).number&＃61;101; student(1).name&＃61;&＃39;wang&＃39;; student(1).specialty&＃61;&＃39;computer&＃39;; student(1).grad e&＃61;[86 85 90 93 97 95];

student(2).number&＃61;102; student(2).name&＃61;&＃39;zhang&＃39;; student(2).specialty&＃61;&＃39;computer&＃39;; student(2).grad e&＃61;[87 88 86 90 83 92];

student(3).number&＃61;103; student(3).name&＃61;&＃39;zhao&＃39;; student(3).specialty&＃61;&＃39;computer&＃39;; student(3).grade &＃61;[70 68 80 78 92 85];

student(4).number&＃61;104; student(4).name&＃61;&＃39;liu&＃39;; student(4).specialty&＃61;&＃39;computer&＃39;; student(4).grade&＃61;[ 88 78 90 82 95 77];

student(5).number&＃61;105; student(5).name&＃61;&＃39;duan&＃39;; student(5).specialty&＃61;&＃39;computer&＃39;; student(5).grade &＃61;[87 68 90 80 75 91]; student

student &＃61;

1x5 struct array with fields:

number

name

specialty

grade

8、建立单元矩阵B并回答有关问题。

B{1,1}&＃61;1&＃xff1b;

B{1,2}&＃61;’Brenden’&＃xff1b;

B{2,1}&＃61;reshape(1:9,3,3)&＃xff1b;

B{2,2}&＃61;{12,34,34,2;54,21,3;4,23,67};

(1)size(B)和ndims(B)分别是多少&＃xff1f;

(2)B(2)和B(4)的值分别是多少?

(3)B(3)&＃61;[]和B[3]&＃61;[]执行后&＃xff0c;B的值分别是多少&＃xff1f;

答&＃xff1a;

B&＃61;{1,&＃39;Brenden&＃39;;reshape(1:9,3,3),{12,34,2;54,21,3;4,23,67}}

B&＃61;

[ 1] &＃39;Brenden&＃39; [3x3 double] {3x3 cell}

size(B)

ans &＃61;

2 2

ndims(B)

ans &＃61; 2

B(2)