How to add/append column in an array in a for loop?

Hello, I want to get the array [25 25 25 25 25] as the end value of Batt. However, the loop overwrites and I get [25 25 25]. I can't seem to figure out how to append the n_EVs(2) from the next column.

n_AGs = 2;
n_EVs = [2 3];
for j=1:n_AGs
    Batt(1,1:n_EVs(j)) = 25;
end

I specifically want to take the value of n_EVs from the array at each iteration and append the Batt at each iteration. For example:

In the first iteration it should give [25 25]. The second iteration should give [25 25 25 25 25] after appending [0 0 25 25 25] to [25 25].

Would appreciate any help. Best!

Answer 1

[Image Analyst]

Does this do what you want:

n_EVs = [2 3];
n_AGs = length(n_EVs)
Batt = [];
for k = 1 : n_AGs
    Batt = [Batt, 25 * ones(1, n_EVs(k))]
end

Output:

n_AGs =

2

Batt =

25 25

Batt =

25 25 25 25 25

And for n_EVs = [2, 3, 5] it gives:

Batt =

25 25

Batt =

25 25 25 25 25

Batt =

25 25 25 25 25 25 25 25 25 25

[Saad]

Thanks for this solution. Appreciate it!

Answer 2

[madhan ravi]

simply without loop:

Batt=repmat(25,1,sum(n_EVs))
%or
Batt=repelem(25,1,sum(n_EVs))
%or
Batt(1:5)=25;

If you want to stick with a loop then:

Batt=zeros(1,sum(n_EVs));
for i = 1:sum(n_EVs) % pfcourse you need to preallocate
    Batt(i)=25; % just use linear indexing
end

Note: you only get three elements because your loop runs only till 2 not 5

[Saad]

I specifically want to take the value of n_EVs from the array at each iteration and append the Batt at each iteration. My apologies for not being to the point earlier.

[madhan ravi]

just give an example of your desired output

[Saad]

In the first iteration it should give [25 25]. The second iteration should give [25 25 25 25 25] after appending [0 0 25 25 25] to [25 25] .

[madhan ravi]

Alright try this:

n_EVs = [2 3];
Batt=zeros(1,sum(n_EVs)); % you need to preallocate
n_AGs = 2;
blabla=[n_EVs(1) sum(n_EVs)];
for i = 1:numel(n_EVs)  
    Batt(1:blabla(i))=25 % just use linear indexing
end

[Saad]

It'll work if n_AGs = 2; but if I change n_AGs = 3; or more it gives error.

For example if I change n_AGs = 3; and n_EVs = [2 3 5];