# Matlab Help!

• MATLAB
bor0000
I tried to write a function that would count all possible combinations that 4 couples could sit at a table assuming no man can sit next to his wife or next to another man. and 1wife and 1 husband sit at fixed positions. my problem doesn't compile and it says i either have too many or too few "end" statements. So please find the mistake:
%4wifes problem: man and wife sit at the corners of the table. others may sit so that no man sits next to his wife or another man
%how many possible arrangements?
function c = fourcouples(trials)
pos=[1,0,0,0,0,0,0,0,0,1];
x=[];
c=0;
count=1;
counter=0;
while count[ trials %set matrix x with all possible combinations

for i=2:9
pos(i)=rand;
if pos(i)[ =.25
pos(i)=1;
else if pos(i)[ =.50
pos(i)=2;
else if pos(i)[ =.75
pos(i)=3;
else
pos(i)=4;
end %of if
end %set random variables, end of forloop1

k=0;
for j=2:8
if pos(j)~=pos(j+1)
k=k+1;
end %end of if
end %end for loop2

if k==7
x=[x;pos]; %augment x by a new arrangement
counter=counter+1; %number of rows of rows of x
end %of if
count=count+1;
end %of while loop
i=1;
y=[];
while i[ =counter %get rid of dupblicate arrangements by setting new matrix y
z=y;
y=[y;x(i,:)];
if det(y)==0
y=z;
else
c=c+1;
end
i=i+1;
end
end
return

bor0000
up. also i wrote a program for "count the probability that n tosses will give k heads" , based on doing many random trials. that program did compile. but i found it to be rather slow. i.e. the most it would do was 100k trials.

after the current problem compiles, i'll try to do monte carlo simulations.