| PV-WAVE [message #4632] |
Wed, 28 June 1995 00:00  |
grueber
Messages: 3
Registered: June 1995
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Junior Member |
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My Problem with the PV-WAVE SDS interface, a subset of HDF from NCSA:
I want to read a one dimensional array of a scientific data set (SDS)
from a HDF file via the function SDreaddate into a two dimensional array
(respective into a subarry of buffer array).
For example:
-------------------------
length = 3000000L
number = 12L
buffer = intarr(length,number)
k = 2
...
status = SDreaddata(sdsid,[0],[1],[len],buffer(0:len,k))
------------------------ ^^^^^^^^^^^^^
This example doesn`t work, despite it's possible to address subarrays
in this manner (array(from:to)) in PV-Wave. Status doesn't indicate
an error! I work around it in this way:
------------------
tmpbuf = intarr(len)
...
status = SDreaddata(sdsid,[0],[1],[len],tmpbuf)
buffer(0:len,k) = tmpbuf
-------------------
But the disadvantage of this work around is the unacceptable
waste of time for the additional copy operation.
Reading 4 MB via SDreaddata lasts about 2 seconds, but copying
the buffer lasts about 10 seconds !!??!!
(This tests were made on a Sparc 20 with enough memory and fast
hard disks)
Does anybody have a solution or a more efficient work around for this
problem?
Thanks for help in advance
Wilhelm Gr"uber
PS: Please send an email directly to my address (grueber@dv.kp.dlr.de)
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| Re: PV-WAVE [message #22951 is a reply to message #4632] |
Thu, 21 December 2000 10:03  |
Pavel A. Romashkin
Messages: 531
Registered: November 2000
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Senior Member |
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Gee, that's a question VN should be able to handle out of courtesy. I
heard that IDL/PVWave licensing is so sophishticated that sometimes you
can't make 'em run not only for a limited time or a given drive, but at
all, especially after an upgrade :-)
Cheers,
Pavel
Dave Lean wrote:
>
> We have developed an application using PV-WAVE.
> We would like to allow potential purchasers to try it out for a limited
> period of time.
> Does anyone know of a method of 'locking' such an application so that, for
> example, it will not work after a certain date, and preferably only on a
> specific hard disk ?
>
> tia
>
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