Convert byte to double

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Malte
Malte 2012-1-9
评论： Geoffrey 2025-4-9
Hi, I have somae data in a byte format that i want to convert to double format. Does anyone know how to do this in matlab?
I have read the data in to a char, where every 8 characters should represent a double.
My data looks like this :
QAAAAAAAaIBAAAAAAADQgUAAAAAAAHCCQAAAAAAAsINAAAAAAAAohEAAAAAAAKCEQAAAAAAA4IVAAAAAAABgiEAAAAAAAJCKQAAAAAAAMItAAAAAAADQi0AAAAAAAGCNQAAAAAAAUI5A
/Malte
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David Young
David Young 2012-1-9
Do you have any more information about how the numbers are coded? It's odd that there are only letters displayed, and there seem to be more than 8 characters per value judging from the periodicity. Showing the value of double(data), where data is your character string, might help.

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Malte
Malte 2012-1-10
I found out that the string was in base64 code, which i have decoded using the base64decode function from: http://code.google.com/p/fieldtrip/source/browse/trunk/external/gifti/@gifti/private/base64decode.m?r=3261
I could then transform the uint8 array produced by base64decode with the typecast function.

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Jan
Jan 2012-1-9
Is there a good reason not to read the data in double format directly?
Usually typecast performs a binary conversion.
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Geoffrey
Geoffrey 2025-4-9
The "typecast" function is useful for things like converting a string of bytes (stored as a uint8 vector for example) into other data types.

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