# Dynamic array variables problems

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Tsz Tsun el 19 de Mzo. de 2023
Editada: Vilém Frynta el 19 de Mzo. de 2023
Hi all, I have some troubles in making an dynamic array. My following code is as follow but get an error.
N = 10;
for k=1:N
for j = 1:5
temp_var = strcat('v_',num2str(k));
eval(sprintf('%s = %g',temp_var(j), j*2));
end
end
Basically I want to have a dynamic array of
v_1(1) =2
v_1(2) =4
v_1(3) =6
v_1(4) =8
v_1(5) =10
v_2(1) = 2
v_2(2) = 4
etc...etc
And so when I print out v_1 it gives 2 4 6 8 10, do does v_2 , v_3 ... v_10. Would anyone offer me some help? Thanks a lot.
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### Respuestas (1)

Vilém Frynta el 19 de Mzo. de 2023
Editada: Vilém Frynta el 19 de Mzo. de 2023
You really should not do this. It's bit tricky to do and.. it will strike back later.
Better solution would be to create a structure and save your numbers there.
v = struct();
nums = 2:2:10;
v.field1 = nums;
v.field2 = nums
v = struct with fields:
field1: [2 4 6 8 10] field2: [2 4 6 8 10]
Could also be (easily) made in for loop as well.
s = struct();
for q = 1:10
s.(sprintf('field%d',q)) = nums;
end
disp(s)
field1: [2 4 6 8 10] field2: [2 4 6 8 10] field3: [2 4 6 8 10] field4: [2 4 6 8 10] field5: [2 4 6 8 10] field6: [2 4 6 8 10] field7: [2 4 6 8 10] field8: [2 4 6 8 10] field9: [2 4 6 8 10] field10: [2 4 6 8 10]
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