Subscript indices must either be real positive integers or logicals. Error in jl (line 51) u = u(i,j,k)

i = lat;
j = long;
k = 1:length(1979:2012);    
u = u(i,j,k)
yrlst = 1979:2012;
  wintlst = 1:3;
  for i = 1:length(yrlst)
      tempwint = wintlst +(i-1)*12
      tmpu = squeeze(nanmean(u(:,:,tempwint),3));
      tmpv = squeeze(nanmean(v(:,:,tempwint),3));
          for j = 1:size(tmpu,1)
              k = 1:size(tmpu,2)
              tuwint(j,k,i) = tmpu(j,k);
              tvwint(j,k,i) = tmpv(j,k);
          end
  end

Answer 1

[Walter Roberson]

One of your values for lat or long is not a positive integer.

find(lat < 1 | lat ~= fix(lat))
find(long < 1 | long ~= fix(long))

[Sophia]

i tried this.. but it says Undefined function 'u' for input arguments of type 'double'.

Error in jl (line 53) u = u(i,j,k);

[Walter Roberson]

Whatever defined your "lat" and "long" needs to define your "u"

[Sophia]

Okie.. Actually u is the value of ice motion in lat i, long j at time k..the range of longitude is -180 to +180.. but i could not find how can i do this for the whole arctic for seasons.. Can you check my other question, i have posted the whole code their