Error field assignment to a non structured array

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weather_data.txt

When running this script I get the error, "Field Assignment to a non-structured array" on line 32, "w.dir = m {6} ; ". I am new to matlab, but I've used this same code before to open a different file with different variable names. I think the issue may be in my textscan command? Any thoughts from the pros?

function w = read_met_station(met_file)
met_file = '\\file\weather_data.txt' ;
fid = fopen(met_file) ; 
if fid == -1 
    error('Error. \nFile can not be opened.  Check path.') ;
    return
end
w = textscan(fid,'%5s %*1c %f %*1c %f %*1c %f %*1c %f %*1c %f %*1c %f %*1c %f %*1c %f %*1c %f %*1c %f %*1c %f %*1c %f %*1c %f %*1c %f %*1c %f %*1c %f %*1c %f %*1c %f','HeaderLines',1) ; 
station_num   = w{1} ;
year          = w{2} ;
month         = w{3} ;
day           = w{4} ;
hour          = w{5} ;
w.dir         = w{6} ;
w.speed       = w{7} ;
w.gustdir     = w{8} ;
w.gustspd     = w{9} ;
w.windrun     = w{10} ;
w.rain        = w{11} ;
w.tdry        = w{12} ;
w.twet        = w{13} ;
w.rh          = w{14} ;
w.tmax        = w{15} ;
w.tmin        = w{16} ;
w.tgmin       = w{17} ;
w.et10        = w{18} ;
w.rad         = w{19} ;
w.dn = datenum(year,month,day,hour,zeros(size(hour))) ;

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KSSV 2017-10-25

YOur w is a class of cell..you are treating it as structure, which is not correct.

geog170 2017-10-25

I ended up being able to fix it by changing all my "w." to "t." and updating the datenum to be (year,month,day). I'm not sure why it is having an issue with the hours.

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