x=randperm(45);
y=randperm(45);
z=randperm(45);
answerperson=x(y(z(22)))

subject.id=1;
subject.age=18;
subject.hand=0;
subject.gender=1;

for i=1:5
    for j=1:6
    mat(i,j)=(i-1)*6+j;
    end
end
mat

% build struct
subject(1).id=51;
subject(1).age=18;
subject(1).hand=0;%0 is left hand.1 is right hand
subject(1).gender=1;% 1 is male, 2 is female
subject(1).data=[1:10];

subject(2).id=2;
subject(2).age=19;
subject(2).hand=1;
subject(2).gender=2;
subject(2).data=[2:8];

subject(3).id=33;
subject(3).age=20;
subject(3).hand=0;
subject(3).gender=2;
subject(3).data=[3:9];

subject(4).id=11;
subject(4).age=21;
subject(4).hand=1;
subject(4).gender=2;
subject(4).data=[11:17];

% sub(2,1).id=1;
% sub(2,1).age=18;
% sub(2,1).hand=1;
% sub(2,1).gender=1;
% 
% sub(2,2).id=2;
% sub(2,2).age=19;
% sub(2,2).hand=1;
% sub(2,2).gender=2;
% 
% sub(2,3).id=2;
% sub(2,3).age=19;
% sub(2,3).hand=1;
% sub(2,3).gender=2;

%% for, if, index,computation
length(subject)
count=0;
for a=1:length(subject)
    if subject(a).gender==2;
        count=count+1;
        dataMean(count)=mean(subject(a).data)
        a
    end
end
dataMean

% if id is random
count=0;
for a=1:length(subject)
    if subject(a).gender==2;
        count=count+1;
        dataMean(1,a)=subject(a).id;
        dataMean(2,a)=mean(subject(a).data);
    end
end
dataMean



subject(1).id=51;
subject(1).age=18;
subject(1).hand=1;
subject(1).gender=1;
subject(1).data=[1:10];

subject(2).id=2;
subject(2).age=19;
subject(2).hand=1;
subject(2).gender=2;
subject(2).data=[2:8];

subject(3).id=33;
subject(3).age=20;
subject(3).hand=2;
subject(3).gender=2;
subject(3).data=[3:9];

animalsub.id=65;
animalsub.data=rand(1,10);
animalsub(2).id=79;
animalsub(2).data=rand(1,7);

allsub.human=subject;
allsub.animal=animalsub;
allsub(2).human=subject;
allsub(2).animal=animalsub;

allsub(2,1).human=subject;
allsub(2,1).animal=animalsub;
allsub(2,2).human=subject;
allsub(2,2).animal=animalsub;

allsub(2,1).animal(2).id
allsub(1).animal(2).id
allsub(2).animal(2).id
allsub(3).animal(2).id
allsub(4).animal(2).id

days=['abc''xyz']
days=['abc','xyz']
words='my mom''s purse is purple'

days={'Mon','Tue','Wed','Thur', 'Fri'};