# Why last line of the code says "Error using reshape Size arguments must be real integers."

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nur m on 13 Dec 2021
Commented: Walter Roberson on 20 Dec 2021
n = 256; % Number of bits to process
x = randint(n,1); % Random binary data stream
M = 16; % Size of signal constellation
k = log2(M); % Number of bits per symbol
xsym = bi2de(reshape(x,k,length(x)/k).','left-msb'); ##### 1 CommentShowHide None
Stephen23 on 13 Dec 2021
According to the Communications Toolbox Release Notes the randint function was removed in release R2016b.
How are you managing to use randint with release R2019b ?

Ashutosh Singh Baghel on 20 Dec 2021
Hi nur,
I understand you want to generate a random stream of 1's and 0's. According to the R2016b release notes, it clearly states - '"Replace all instances of randint with randi."
'randint(1,1,[1,n])' would now be written as 'randi([1,n],1,1)'.
Please see the following example -
n = 256; % Number of bits to process
A = randi([0 1],n,1); % Random binary data stream
Also, using reshape function , the syntax is as -
k = 8;
B = reshape(A,[k,n/k]);
size(A)
ans = 1×2
256 1
size(B)
ans = 1×2
8 32
Please follow the MATLAB Documnetation link for 'reshape','randi' and 'R2016b release notes.'
##### 1 CommentShowHide None
Walter Roberson on 20 Dec 2021
k = 8;
B = reshape(A, k, []);
would also work.

R2019b

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