Task 05 : 结构数组

结构数组

创建

例3.26 下表为学生档案，数组名为student，试用结构数组表示

student(1).ID = 101;
student(2).ID = 102;
student(1).name = 'wang';
student(2).name = 'chang';
student(1).age = 21;
student(2).age = 20;
struct(student)

>> practice
ans = 
  包含以下字段的 1×2 struct 数组:
    ID
    name
    age

结构数组与单元数组转换

S = struct('category', 'tree', 'heigh', '28.5', 'name', 'brich')
C = struct2cell(S)
size(C)

>> practice
S = 
  包含以下字段的 struct:

    category: 'tree'
       heigh: '28.5'
        name: 'brich'
C =
  3×1 cell 数组
    {
     'tree' }
    {
     '28.5' }
    {
     'brich'}
ans =
     3     1

例3.28 顺接例3.26，将结构数组student转换成单元数组C

student(1).ID = 101;
student(2).ID = 102;
student(1).name = 'wang';
student(2).name = 'chang';
student(1).age = 21;
student(2).age = 20;
struct(student)
C = struct2cell(student);
C = [C(:,1), C(:,2)]

>> practice
ans = 
  包含以下字段的 1×2 struct 数组:
    ID
    name
    age
C =
  3×2 cell 数组
    {
     [ 101]}    {
     [  102]}
    {
     'wang'}    {
     'chang'}
    {
     [  21]}    {
     [   20]}

单元数组的数据处理

例3.29 求88，95，79，73的平均数

C{
     1,1} = 88;
C{
     1,2} = 95;
C{
     1,3} = 79;
C{
     1,4} = 73;
s = 0;
for i = 1 : 4
    s(i) = C{
     1,i};
end, s, mean(s)

>> practice
s =
    88    95    79    73
ans =
   83.7500