[ncl-talk] warning during read ascii file

[grace]

Hi,all:
        I have read data from ASCII file with NCL:
        ascii_filename = "/public/home/huanglei/data/ob.txt"
       seismic = asciiread(ascii_filename,(/725,6/),"float")   
  
     time_o= seismic(:,1)  ; Column 1 of file contains X values.
      p_o = seismic(:,2)  ; Column 2 of file contains Y values.
     t2_o= seismic(:,3)  ; Column 3 of file contains Z values.
      wdir_1= seismic(:,4)  
     wspd_1 = seismic(:,5)  
  
  
  
  the part of data in the  ascii file(ob.txt)  are like this:
 57131      2015051122  0             187        199        20 
57131      2015051123  0             154        250        3  
57131      2015051200  0             144        309        11 
57131      2015051201  0             133        25         8  
57131      2015051202  0             127        31         16 
57131      2015051203  0             116        15         12 
57131      2015051204  0             104        272        16 
57131      2015051205  0             113        91         5  
57131      2015051206  0             95         340        6  
57131      2015051207  0             115        349        7  
57131      2015051208  0             139        323        11 
57131      2015051209  0             164        252        16 
57131      2015051210  0             185        204        31 
57131      2015051211  0             206        247        19 
57131      2015051212  0             227        212        15 
57131      2015051213  0             241        301        12 
57131      2015051214  0             249        144        19 
57131      2015051215  0             260        187        14 
57131      2015051216  0             269        183        22 
57131      2015051217  0             271        212        20 
57131      2015051218  0             279        276        8  
57131      2015051219  0             265        295        11 
57131      2015051220  0             217        310        12 
57131      2015051221  0             208        339        8  
57131      2015051222  0             202        35         5  
57131      2015051223  0             200        279        17 
57131      2015051300  0             182        32         5  
57131      2015051301  0             181        20         16 
57131      2015051302  0             161        98         6  
57131      2015051303  0             157        40         17 
57131      2015051304  0             149        125        4  
57131      2015051305  0             154        185        8  
  
 but it have warning:
 warning:asciiread: End of file reached and only (2984) elements were read from the file, filling remaining elements with the default missing value for the requested type

 
how to set the default missing value ?
 How can I slove the problem?

 Or do you guys have some advice?
 any information will be appreciated
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