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

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');

[Stephen23]

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 ?

Answer 1

[Ashutosh Singh Baghel]

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.'

[Walter Roberson]

k = 8;
B = reshape(A, k, []);

would also work.