Draw Path From Multiple Lines

[nigeljw3]

I am trying to create a plot with multiple lines. I specifically want to draw a path, but this can be simplified to drawing multiple lines. I have tried two different ways from the documentation:
https://alandefreitas.github.io/matplotplusplus/plot-types/line-plots/line-plot/

I am just trying to draw all lines in the path. If I use a set, it only lets me specify one set for X, and I can't seem to add a second set for the Y positions. Can someone clarify the correct way to do this?

std::set<std::vector> linePointsX;
std::set<std::vector> linePointsY;
...
matplot::plot(linePointsX, linePointsY);

This gives me the following error:
Error C2664 'matplot::line_handle matplot::axes_type::plot(const std::vector<double,std::allocator> &,const std::vector<double,std::allocator> &,std::string_view)': cannot convert argument 1 from 'std::set<std::vector<double,std::allocator>,std::less<std::vector<double,std::allocator>>,std::allocatormatplot::vector_1d>' to 'const std::vector<double,std::allocator> &'

In other examples, it calls plot multiple times, and they overlap in the same plot, but when I try to call plot multiple times, it refreshes to only show the single line for each plot, even though I only call show once.

[nigeljw3]

I tried adding the lines in the same set

std::vector<double> pointsX; std::vector<double> pointsY; pointsX.push_back(point1.x); pointsX.push_back(point2.x); pointsY.push_back(point1.y); pointsY.push_back(point2.y); linePoints.insert(pointsY); linePoints.insert(pointsX); matplot::plot(linePoints);

But it doesn't work the same as adding them explicitly with plot(x1, y1, x2, y2, x3, y3, ...). This is the result:

[alandefreitas]

The error is telling you the function expects vector<double>, not a set<vector<double>>.

[nigeljw3]

I understand the error, but do not understand what should be the expected function call to use a set for both X and Y. It only allows one like in this example from the documentation for line plots:

`#include <matplot/matplot.h>
#include

int main() {
using namespace matplot;

std::set<std::vector<double>> Y = {
    {16, 5, 9, 4}, {2, 11, 7, 14}, {3, 10, 6, 15}, {13, 8, 12, 1}};
plot(Y);

show();
return 0;

}`

[alandefreitas]

I'm not sure I understand the semantics of your sets, but I guess you want a shortcut for:

std::set<std::vector> linePointsX;
std::set<std::vector> linePointsY;
// ...
auto it0 = linePointsX.begin();
auto end0 = linePointsX.end();
auto it1 = linePointsY.begin();
auto end1 = linePointsY.end();
for (; it0 != end0 && it1 && end1; ++it0, ++it1)
    matplot::plot(*it0, *it1);

?

I'm not sure figure_type has a function that does that for you. It never came up.

[nigeljw3]

Yeah, and the problem that I am running into is that if I call plot() multiple times, it displays each plot() call in sequence instead of overlapping them into one plot. Essentially the show() function is happening as a part of the call to plot() (even without calling show()) so it displays each one in sequence.

[nigeljw3]

I also can't save as an image because of this similar issue I mentioned here:
#243

[alandefreitas]

displays each plot() call in sequence

Then you need to call hold(true) (and read the docs)

[nigeljw3]

I want to be able to plot a set of lines with x and y values from sets/vectors.

[nigeljw3]

Like in the above sample using the set, how can I set explicit x values?