What is the most efficient method to create a vector field plot using a non rectangular dataset?

I have several arrays each named x,y,u,v where each are 1 dimensional lists, x,y are the coordinate of the base of a vector. u,v is not related to its coordinate but represent the vector itself. The complete dataset is NOT rectangular. For example 1,2,1,2 represents a vector which has a base at a grid coordinate x,y = 1,2 and it moves 1 unit to the right and 2 units up however there may not be a dataset where x,y = 1,1.

I've tried using subplot and multiple quivers but it seems subsequent plots overwrite the previous and do not overlay on-top of the preceding quiver plot.

Answer 1

[Star Strider]

You didn’t post your code, so I don’t know what you’ve done.

If you’ve not already been introduced to the hold (link) function, it may be what you want.

[Star Strider]

I’ve no idea what you want.

Try this:

[D,S] = xlsread('unemap_example_vector_data.csv');

figure(1)
quiver(D(1,:), D(2,:), D(3,:), D(4,:))
axis equal
grid

[David Johnson]

Ahh, axis equal did it!

[Star Strider]

Good!

Answer 2

[David Johnson]

Quite sorry I did not post example data last week.

In the example data sets attached (one is xls, the other a csv - however identical data). The resulting map should have the base of each vector forming something that looks a bit like a triangle with vectors within it.