How to keep only 3 digits after the dot on a number?
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Hello
I have an array (1000x11) of binary numbers like this :
1 0 1 1 0 0 0 1 1 0 0
0 0 0 1 0 1 1 0 1 0 0
1 1 1 0 1 1 0 1 1 0 0
0 0 0 1 1 0 1 1 0 1 1
1 1 0 1 0 1 0 0 1 1 1
0 1 0 0 1 0 0 0 0 0 1
0 0 0 0 1 0 1 1 0 0 0
1 0 1 0 0 0 1 1 0 1 0
And I want to turn each row into a float decimal (x) with the last 10 binary digits as the numbers after the dots. I did this:
x = x(:, 1) + (x(:, 2:11) * 2.^(9:-1:0).') / 1000
but I got :
x = 1.8260
x =0.1110
x =1.9900
x =1.1640
x =0.3050
x = 0.6640
and I get the error 'Index exceeds matrix dimensions' so I have to take only the first 3 digits after the dot. How do I do that?
3 Comments
James Tursa
on 7 May 2021
Edited: James Tursa
on 7 May 2021
What would help us is for you to give us a description of inputs and desired outputs, with some small examples. E.g.,
"I am starting with these binary digits 101101001 and I want to do calculations that turn it into the floating point number ___."
(you fill in this blank for us)
Answers (1)
Chunru
on 7 May 2021
Try the following:
x = randi([0 1], 4, 11)
%x = x(:, 1) + (x(:, 2:11) * 2.^(9:-1:0).') / 1000 ; % May not accurate
x = x * 2.^(0:-1:-10)' % This is the binary value
5 Comments
Jan
on 8 May 2021
Then a binary representation an in Chunru's answer is better than a pseudo decimal interpretation.
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