Assign values(form of a row vector) with different sizes to a matrix(fixed size), row by row

Let's say I have initialized a matrix with size m x n.

Now with a "for" loop, I assign the values row by row to this matrix, but the size of each row is different(all <= n).

This is currently giving me "Subscripted assignment dimension mismatch" error, what should I do if I want to do something like this?

Answer 1

[KSSV]

In that case you have two options.....

1. Option 1

Go for saving the data into cell .

m = 10 ;
iwant = cell(m,1) ;
for i = 1:m
    iwant{i} = rand(randperm(100,1),1) ;
end

2. Option 2

Append NaN/ zeroes to extra data

m = 10 ;
n = 10 ;
iwant = NaN(m,n) ;
for i = 1:m
    k = randperm(8,1) ;
    iwant(i,1:k) = rand(1,k) ; 
end

[jin wang]

Thank you for the answer. If I choose option 2 but I don't know k, neither how the k can be calculated. Then how should I control the size like you did in the example?

iwant(i,1:k) = rand(1,k) ;

I will try len(), but it doesn't seem working