How can I change the LineWidth according to several conditions?

I am applying a compass plot and I would like the line's width changes according to certain conditions depending on one variable numress. I would like that if 0<numress<10 the LineWidth in plot plot is 0.5, if 10<numress<50 the LineWidth is 2. And so on

I tried this but does not work:

h=compass(u,v,'r')

if (0<=numress) & (numress<=10)

      h.LineWidth=0.5
  end
  if (10<numress) & (numress<=50)
      h.LineWidth=2
  end
  if (50<numress) & (numress<=100)
      h.LineWidth=4
  end
  .
  .
  .
  if (500<numress) & (numress<=550)
      h.LineWidth=22
  end
  get(h,'LineWidth')

I tried with: get, set but the lines width do not change in my compass plotting. Can you please help me with this problem? Thank you

[jonas]

set(h,'linewidth',10)

should change all the lines stored in the handle 'h'. If you want to change specific lines then you must specify those lines as h(1), h(2)... etc

Answer 1

[Image Analyst]

Often you pass in the line width. So compute it in advance, then pass it in when you call compass():

h=compass(u, v, 'r', 'LineWidth', lineWidth); % lineWidth value computed in advance.