How to insert an element to Eigen::ArrayXd?

[frail reef]

I tried to look into the official docs but have little experience reading them. It is a dynamic array so I assume it should have push_back method like std::vector?

[stray kindle]

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[woven falcon]

it's not designed with dynamic resizing in mind

if you need to add an element you'll have to manually resize the array and copy the existing elements, plus the new one, into it

like

Eigen::ArrayXd arr(3);
arr << 1, 2, 3;

double newElement = 4.0;

Eigen::ArrayXD newArr(arr.size() + 1);

newArr.head(arr.size()) = arr;

newArr(arr.size()) = newElement;

std::cout << "New array: \n" < newArr < std::endl;

[frail reef]

thank you, I find the documents to be pretty hard to read, or is it because I have read too few docs?
I find related information (using resize) on stackoverflow

[stray kindle]

@frail reef Has your question been resolved? If so, run !solved :)

[woven falcon]

you'll get better at reading docs over time, but not all docs are created equal - there wouldn't be stuff on stackoverflow if no one else needed help beyond the official documentation. regarding resize: yes, you can also use resize to change the size of Eigen::ArrayXd, but you'll still need to manually copy over the old data and insert the new element, as above