# merge two arrays into one

2 views (last 30 days)
Sehoon Chang on 3 Jul 2021
Answered: Yongjian Feng on 3 Jul 2021
i am trying to merge two arrays into one array.
The goal is to create a load cycle graph of a storage system.
One array is called "charge amount" and the other array is called "discharge amount".
for example:
charge amount = [ 1 2 3 4 5 0 0 0 0 0 1 2 3 4 5 .....]
discharge amount = [ 0 0 0 0 0 -1 -2 -3 -4 -5 0 0 0 0 0 .....]
how can i merge either one of the array into the other one where the value is zero (0)?
for example:
load cycle = [1 2 3 4 5 -1 -2- 3- -4 -5 1 2 3 4 5 .....]
Sehoon Chang on 3 Jul 2021
btw the elements within arrays are not in 5 element increments. the examples are just to show that there are 0 values and non-0 values

Star Strider on 3 Jul 2021
One option is simply to add them:
charge_amount = [ 1 2 3 4 5 0 0 0 0 0 1 2 3 4 5];
discharge_amount = [ 0 0 0 0 0 -1 -2 -3 -4 -5 0 0 0 0 0];
1 2 3 4 5 -1 -2 -3 -4 -5 1 2 3 4 5
That works for this example, at least.
.
##### 2 CommentsShowHide 1 older comment
Star Strider on 3 Jul 2021
As always, my pleasure!
.

Yongjian Feng on 3 Jul 2021
Not sure what you really want.
1. If those two arrays have the same length at the time, and if the ith element of one array is non-zero, the ith element of the other array is always 0 (just like those two you showed), then it is just as easy as merged = charge_amount+discharge_amount;
2. If you need to put in extra logic then you can loop through those arrays:
charge_amount = [1 2 0 0 3 4];
discharge_amount = [0 0 5 6 0 0];
merged = zeros(1, length(charge_amount));
for i=1:length(charge_amount)
% here assuming you sum them up only if one is zero, the other one is
% not
if (charge_amount(i) == 0 && discharge_amount(i) != 0) || (discharge_amount(i) == 0 && charge_amount(i) != 0)
% if one is zero and the other one is not, merge
merged(i) = charge_amount(i) + discharge_amount(i);
elseif charge_amount(i) == 0 && discharge_amout(i) == 0
% it doesn't make any difference sum them or not
else
% they are both non-zero, what do you want for this case?
end
end