# How to assign a vector with predefined data?

1 view (last 30 days)
israt fatema on 25 Aug 2021
Commented: israt fatema on 30 Aug 2021
I need to a assign a n x n vector with data and use that vector to call a function. All example i found is for creating random or zero vector.
x size n x n (5 x 5) and n must equal length(y), and y size n x 1
A = [10695.88;10446.39;10082.36;9760.39;9390.26];
B = [10705.50;10439.13;10171.95;9794.65;9455.76];
x = vector of A with size 5 x 5 ?
y = vector of B with 5 x 1 ?
Thank you.

Shanmukha Voggu on 30 Aug 2021
Hi fatema,
I understand that you want to create a vector with predefined data instead of using zeros, ones, rand functions.
let's create a vector A(5 x 1)
A=[1;2;3;4;5]
A = 5×1
1 2 3 4 5
let's create a vector B(5 x 5) from the predefined data(A)
B=A(:,[1,1,1,1,1])
B = 5×5
1 1 1 1 1 2 2 2 2 2 3 3 3 3 3 4 4 4 4 4 5 5 5 5 5
The same result as above can be achieved by doing the following
RowCount = size(A, 1)
RowCount = 5
ColumnIndexes = ones(1, RowCount)
ColumnIndexes = 1×5
1 1 1 1 1
B=A(:, ColumnIndexes)
B = 5×5
1 1 1 1 1 2 2 2 2 2 3 3 3 3 3 4 4 4 4 4 5 5 5 5 5
The best way to use the predefined data is to index it to get the desired results. refer to this document for more info.
israt fatema on 30 Aug 2021
Thank you very much.