1
$\begingroup$

enter image description here

I want to plot a trigonometry function (for example : $\lfloor 2\cos x\rfloor$) using Mathematica. And I want to scaling x axis using multiples of $\pi$ . For example $\frac{\pi}{2}$ , $\pi$ , $\frac{3\pi}{2}$ and $2\pi$. But in the graph doesn't show exact point of roots.

Please Help!

Improve this question
$\endgroup$
2
  • 1
    $\begingroup$ stackoverflow.com/questions/8936579/… $\endgroup$
    – Alan
    Commented Dec 3, 2016 at 20:33
  • $\begingroup$ @Alan Thank you , But it doesn't show exact values of roots in the graph versus $\pi$ multiples. $\endgroup$
    – S.H.W
    Commented Dec 3, 2016 at 20:47

1 Answer 1

Reset to default
3
$\begingroup$ 
sol = Sort@
  DeleteDuplicates@
   Cases[Table[
     Reduce[Floor[2 Cos[x]] == i && 0 < x < 2 Pi, x], {i, -2, 2}], 
   _Times, Infinity]

enter image description here

ticks = Transpose@{sol, sol};

Plot[Floor[2 Cos[x]], {x, 0, 2 Pi}, Mesh -> {Range[-2, 2]}, 
 MeshFunctions -> {#2 &}, MeshStyle -> Directive[Red, PointSize[.02]],
  Ticks -> {ticks, Automatic}, Filling -> Axis]

enter image description here

Improve this answer
$\endgroup$
5
  • $\begingroup$ Fantastic ! Thank You. $\endgroup$
    – S.H.W
    Commented Dec 3, 2016 at 23:49
  • $\begingroup$ Can you provide a good source for learning Mathematica ? $\endgroup$
    – S.H.W
    Commented Dec 3, 2016 at 23:52
  • $\begingroup$ @S.H.W Practice and this site :) $\endgroup$
    – corey979
    Commented Dec 3, 2016 at 23:53
  • $\begingroup$ In your picture , some of points must be empty. How I can determine this points ? $\endgroup$
    – S.H.W
    Commented Dec 3, 2016 at 23:55
  • $\begingroup$ What is an empty point? $\endgroup$
    – corey979
    Commented Dec 4, 2016 at 10:02

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.