sticking together 4 hex bytes question

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fima v
fima v 2020-11-1
评论： Ameer Hamza 2020-11-1
Hello I have four DECIMAL numer for example 31(1F) 47(2F) 63(3F) FF(255)
how using those decimal numbers i get a HEX number of 1F2F3FFF?
Thanks.

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回答（2 个）

Ameer Hamza
Ameer Hamza 2020-11-1
编辑：Ameer Hamza 2020-11-1
Try this code
x = [31 47 63 255];
y = reshape(dec2hex(x).', 1, [])
Result
>> y
y =
'1F2F3FFF'
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fima v
fima v 2020-11-1
编辑：fima v 2020-11-1
but X was a row vector in the beginning :-)
How its different now?
maybe it means make row vector with one column? that will explain wjy we get one number 1X1 vector.
Thanks.
Ameer Hamza
Ameer Hamza 2020-11-1
I think it is better you run the following lines one by one. Then you will get an idea of what is happening
x = [31 47 63 255];
y = dec2hex(x)
y = y.'
y = reshape(y, 1, [])

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Walter Roberson
Walter Roberson 2020-11-1
x = [31 47 63 255];
swap(typecast(uint8(x), 'uint64'))
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Walter Roberson
Walter Roberson 2020-11-1
ah yes you are right, swapbytes and uint32
fima v
fima v 2020-11-1
编辑：fima v 2020-11-1
Hello Walter, can i please have intuition for the line Ameer posted?
first you take my array and convert each member from uint8 to uint32 are you dound zero padding?
then in each member you swap its numbers ,Why?
Then you convert each member from decimal to hex ,but our number is not decimal its uint_32
and we still have an array,how it came to be only one number?
Thanks.

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