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Re: 8 byte to double? [message #92601 is a reply to message #92600]

Wed, 20 January 2016 05:34

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

fawltylanguage@gmail.com writes:

>
> On Wednesday, January 20, 2016 at 1:39:07 PM UTC+1, LNpellen wrote:
>> I'm lost - and I thought I had solved this previously, but I simply can't find it (maybe it was in php or something...).
>>
>> Some values in the DICOM header for some vendors happens to save floating (double-presition?) values as 8-bytearrays
>>
>> Is there a simple way in IDL to convert this bytearray to a double without coding the type conversion yourself?
>>
>> I couldn't manage to use the DOUBLE function for this.
>>
>> Ex.:
>> I have the byte array [205 204 204 204 204 204 49 64] and it think from my annoyingly short notes that it should be 17.8...?
>>
>> Best regards,
>> Ellen
>
> IDL> b=[205b,204b,204b,204b,204b,204b,49b,64b]
> IDL> print, fix(b, 0, 1, type=5)
> 17.800000

Lajos is right, but here is a little fuller explanation:

http://www.idlcoyote.com/code_tips/packfloat.php

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")

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[Message index]

		8 byte to double? By: LNpellen on Wed, 20 January 2016 04:39
		Re: 8 byte to double? By: Lajos Foldy on Wed, 20 January 2016 04:58
		Re: 8 byte to double? By: David Fanning on Wed, 20 January 2016 05:34
		Re: 8 byte to double? By: LNpellen on Wed, 20 January 2016 05:45

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