Error using .* in MATLAB

% path to data directory on Jens' iMac
folderpath = '/C:/SIC_data/daily/';
%%latitudes and longitudes and area elements for each grid cell
fid = fopen('psn25lats_v3.dat');
lat = fread(fid,[304,448],'int')./100000;
fclose(fid);
fid = fopen('psn25lons_v3.dat');
lon = fread(fid,[304,448],'int')./100000;
fclose(fid);
fid = fopen('psn25area_v3.dat');
area = fread(fid,[304,448],'int')./1000;
fclose(fid);

%%process years 2002-2012
years = 2002:2012;

% initiate ice concentration tensor
ice_conc_daily = NaN.* zeros(304,448,numel(years),366); % (rows, columns, years, days)

for year = years,
  disp(year); % show year on screen to follow progress
  % a year index
  yi = year - min(years) + 1;
  % each year in separate folder named 'year'
  datapath = fullfile( num2str(year), '/');
  % make list of files in selected folder
  files = dir( fullfile(folderpath,datapath,'nt_*_v01_n.bin') ); 
  % exception!
  if year==2007, % we have two satellites this year and twice the files, only use f17
    files = dir( fullfile(folderpath,datapath,'nt_*_f17_v01_n.bin') ); % only f17 sensor
  end
  files = {files.name}';
  % go through all files and add into datamatrix dcube
  for i=1:numel(files)
    %disp(files{i}); % show filename on screen to follow progress 
    filename = fullfile(folderpath,datapath,files{i}); % full path to file
    fid = fopen(filename);
    d = fread(fid,[304,448]); % read data, call it 'd'
    fclose(fid);
    % % Table 5. Description of Data Values
    % % Data Value  Description
    % % 0 - 250  Sea ice concentration (fractional coverage scaled by 250)
    % % 251  Circular mask used in the Arctic to cover the irregularly-shaped data gap around the pole (caused by the orbit inclination and instrument swath)
    % % 252  Unused
    % % 253  Coastlines
    % % 254  Superimposed land mask
    % % 255  Missing data

      % calculate percentage sea ice concentration
      d(d<=250) = d(d<=250)./250 .* 100; % keep values over 250
      %d(d>250)=NaN; % remove values over 250
      % extract date from filename
      dstring = files{i};
      yyyy = str2double(dstring(4:7)); % had to change to double because of datenum
      month= str2double(dstring(8:9));
      day  = str2double(dstring(10:11));
      doy = datenum(yyyy,month,day)-datenum(yyyy,1,0); % day of year
      % create large tensor
      ice_conc_daily(:,:, yi, doy) = d;
    end
end
% 
% % save to file
% save NSIDC_NT_25km_2002_2012_daily_ice_conc.mat ice_conc_daily lat lon area -v7.3

[Matt J]

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