How to solve a problem in a user friendly program?

Dear all, I have a problem with the folllowing user friendly program.

%AVkam=[1;2;3;4;5;6;7;8] %m=number of averages %n=total number of averages a=size(AVkam);

n=a(1,1)

m=input('Hello, enter the number of averages : ');

if m<=0 display('error, enter again a number of averages')

elseif m>n

 display('error, enter again a number of averages')

elseif m<=n

b=n/m;
%%%%%%%%%make the smaller integer%%%%%

c=floor(b)

nurow=n-c*m

NewAVkam=AVkam(1:n-nurow,:)

Result=(1:c)

end

for i=1:c

    nvk(i,1)=sum(NewAVkam(1+(i-1)*m:m*i,1),1)./m;

end

nvk

Problem: when I enter a negative value or a value which is higher than n, i get this message Undefined function or variable 'c'.

Undefined function or variable 'c'.

Error in tesuser1 (line 44) for i=1:c

 What I want in my program is that the user re enter a value till this value is lower than n.Do you kow how can I solve this problem?

Thanks in advance

Answer 1

[Jos (10584)]

Use a WHILE loop. This example may get you started.

isOK = false ;
while ~isOK
  A = input('Give a number: ')
  if A < 0
     disp('Error: it should be larger than zero')
  elseif A >= 10
     disp('Error: it should be smaller than 10')
  else
     isOK = true ;
  end  
end
disp(A)

[afrya]

Thank you for your answer