help:problem when using "fbindiread" function

 Hi,
    Taday I have a binary reading problem when using "fbindiread" function .
    So I design a test as following to read a "direct" "unformated" binary data "t.grd".
    I think that when give "dims" to the function "fbindirread(path, nrec, dims, "float")" , the record number is then determined by the as :
        number of record = (data's legth)/dims
    So, I think I can read the data segment which I want without read the whole data. But the following script "t.ncl" and it's result puzzled me:
&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&
The following is the output of "% ncl -x t.ncl" :
&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&
 Copyright (C) 1995-2007 - All Rights Reserved
 University Corporation for Atmospheric Research
 NCAR Command Language Version 4.3.0
 The use of this software is governed by a License Agreement.
 See http://www.ncl.ucar.edu/ for more details.
+ begin
+ a = new((/2/),float)
+ b = ispan(1,10,1)*1.
+ print (b)
+ print ("")
+ fbindirwrite("./t.grd",b)
+
+ do nrec=0,4
+ a = fbindirread("./t.grd",nrec,2,"float")
+ print("nrec="+nrec+ " "+a(0)+ " "+a(1))
+ end do
+
+ end

Variable: b
Type: float
Total Size: 40 bytes
            10 values
Number of Dimensions: 1
Dimensions and sizes: [10]
Coordinates:
(0) 1
(1) 2
(2) 3
(3) 4
(4) 5
(5) 6
(6) 7
(7) 8
(8) 9
(9) 10
(0)
(0) nrec=0 1 2
(0) nrec=1 3 4
(0) nrec=2 5 6
(0) nrec=3 1 2 ; Here I had suposed the third record to be "7 8" ,but it was "1 2"
(0) nrec=4 3 4 ; Here I had suposed the third record to be "9 10" ,but it was "3 4"
&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

       Any help is appreciated.
        
Li
2006.6.21

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Received on Thu Jun 21 2007 - 07:53:29 MDT