QVector merge

[_Mark_]

I would like to "merge" two QVector of the same size into one third QVector. Example:

@
QVector<qreal> x;
QVector<qreal> y;

// fill both x and y with the same number of items

QVector<QPointF> pos; // composed of x and y values
@

How to achieve that?

[SGaist]

Hi,

Do you mean something like

@for (int i = 0 ; i < x.size() ; ++i) {
pos << QPointF(x.at(i), y.at(i));
}@

?

[_Mark_]

Exactly, but I'm looking for something better than the trivial method - if exists.

[mikeosoft]

I'm not in a position to test this, but as a quick response, I think you can use the +=, or the the + operator or possibly the append() method.

[SGaist]

What do you mean by better ?

[_Mark_]

I'd like to avoid cycling over all the elements.

[SGaist]

Then how would you create a new object of a different class that uses one element of both vectors ?

[_Mark_]

Well, the final goal is to easily handle a progressive graph.
I'm using qwt and the qwtdataseries class requires a QVector<QPointF>.

I was going to create a "constant" (I mean I won't change its values) QVector for x axis: 0..1..2..3..4 and so on.
The y QVector will be instead pushed and popped every sample received.
In this way I easily create a scrolling graph in real-time.