[udf-dlm-develop] udf-dlm and matrix

[Joerg-Micha J. <jm...@Or...>]

This is an excerpt from an exchange about "matrix" implementation in
udf-dlm. This message and the response to it (next message) will show a
possible implementaiton path.

Jörg-Micha

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(...)

I haven't read through udf.c completely, but the way I understand this is
supposed to work is that after the file is open and the structure in
place, you just make consecutive calls to read_drec until you are done
reading what you want to read.

To make "matrix" work this needs two things: set up the correct structure,
and read in *all* data. If you read the VIDF/PIDF, you already know a
matrix is coming - but you don't know it's size. The first read_drec will
get you MCol>0, then you know what your loop needs to be :

        for (i = 1; i < MCol; i++) 

To add the loop is the easy part. Now, what about the structure? You know
only *after* the first read_drec, how big the matrix is going to be. Will
this be easy to implement in the code??

jmj

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   Jörg-Micha Jahn, Ph.D.

   Space Science Department               Phone:   (210) 522-2491
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