Name of plot where two variables of a time-dependent data are plotted without time Say one has two variables that change with time in a cyclical manner but instead of plotting time on the x-axis, one plots them directly —without applying a transform or any kind of manipulation. I know it is absolutely not brain surgery, but I once encountered a name for this and I cannot recall what it is. What is it called?
Matlab had an animated plot called a comet plot, but it wasn't that. It wasn't an arrow plot either (also that would be a quiver plot in my mind).


A phase space is a space where all possible states of a time-varying system are represented. This matches your plot because all possible configurations of those 2 variables are represented on the plane of the graph.
The concept of "time" is only represented implicitly as the path between the observed data. This is clearer if we animate the plot so that the earliest data are plotted first, and then we add data sequentially during the animation.
