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Re: 20040322: Java NetCDF Newbie - Write/Read Array Of Strings

Unidata Support wrote:


------- Forwarded Message


To: "'address@hidden'" <address@hidden>
From: "Nguyen, Cu (NIH/NCI)" <address@hidden>
Subject: Java NetCDF Newbie - Write/Read Array Of Strings
Organization: NIH
Keywords: 200403221657.i2MGvJrV029768 netCDF Java


Hi All,

        I am a new Java NetCDF user trying to create an array of strings on
NetCDF using some examples that
I found in the NetCDF FAQ. The NetCDF file created successfully but It only
stores the last string in the array.
Please take a look at the following code and let me know what I am doing
wrong. ( I also tried to set Range between 1 and 2 and ArrayChar.D2 without any success). 

                nSets=4;
           testName   = new String[nSets];
           testName[0]="name1";
           testName[1]="name2";
           testName[2]="name3";
           testName[3]="name4";

                NetcdfFileWriteable ncFile = new NetcdfFileWriteable();
        ncFile.setName(filename);
                Dimension t1Dim = ncFile.addDimension("example", nSets);

                Dimension[] dim1 = new Dimension[1];
                dim1[0] = t1Dim;

                ncFile.addVariable("testName", char.class, dim1);
        ncFile.create();
// -------------------------------- 

        ArrayChar ac = new ArrayChar.D1(5);
for(int y = 0; y < nSets; y++) { 
                        ac.setString(testName[y]);
                }

                ncFile.write("testName", new int[1],ac);
                /* ncFile.write("testName", ac);*/

        ncFile.close();

Thanks,
CNguyen

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When dealing with Strings, you need a nother dimension. heres how to make it work: 

 public void testWriteStringWork() {

   int n=4;
   String[] testName   = new String[n];
   testName[0]="name1";
   testName[1]="name2";
   testName[2]="name3";
   testName[3]="name4";

   NetcdfFileWriteable ncFile = new NetcdfFileWriteable();
   ncFile.setName(TestAll.topDir+"testWriteStringWork.nc");
   Dimension d1 = ncFile.addDimension("example", n);
   Dimension d2 = ncFile.addDimension("strlen", 5);

   ncFile.addVariable("testName", char.class, new Dimension[] {d1, d2});
   try {
     ncFile.create();

     ArrayChar ac = new ArrayChar.D2(n, 5);

     for (int y = 0; y < n; y++) {
       ac.setString(y, testName[y]);
     }

     ncFile.write("testName", new int[2], ac);
     /* ncFile.write("testName", ac);*/

     ncFile.close();
   } catch (IOException ioe) { ioe.printStackTrace(); }
 }

gives this:

netcdf C:/dev/netcdf-java/test/data/testWriteStringWork.nc {
dimensions:
  example = 4;
  strlen = 5;

variables:
  char testName(example, strlen);

data:
 testName ="name1", "name2", "name3", "name4"
}