Convert byte to double

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

[David Young]

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.

Answer 1

[Malte]

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.

Answer 2

[Jan]

Is there a good reason not to read the data in double format directly?

Usually typecast performs a binary conversion.

[Geoffrey]

The "typecast" function is useful for things like converting a string of bytes (stored as a uint8 vector for example) into other data types.