How to create a new matrix with a for loop?

Hello friends,

I am a newbie. I have problem.

I have 20 (1x100) different named vectors. I want to combine these vectors to create a 20x100 matrix with a for loop.

There are the examples of vectors.

namelist=["First","B","New"]

namelist = 1×3 string array
    "First"    "B"    "New"

First = [1:100]

First = 1×100

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

B = [1:2:200]

B = 1×100

1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59

New = [4:4:400]

New = 1×100

4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80 84 88 92 96 100 104 108 112 116 120

I want to create a new database(20x100) with "First, B , New" vectors with a for loop.

for i = 1: length(namelist)
    new_database(i,1:end) = namelist{i}
end

The end operator must be used within an array index expression.

But, when I want to try this I saw "The end operator must be used within an array index expression." error.

I know I can do same thing with this code

new_database= [First;B;New]

but i want to do this with a for loop.

Would you help me how can fix this error? or Would you explain me how can do this?

Answer 1

[KSSV]

You should not create individual arrays like that. You should proceed something like this

iwant = zeros(3,100) ; 
iwant(i,:) = 1:1:100 ;
iwant(2,:) = 2:2:200 ; 
iwant(3,:) = 4:4:400 ; 

[Mert Dogan]

Thanks for your answer.

I had already created individual arrays like that. I must to process them.