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Homework Help: Plotting in Matlab

  1. Nov 12, 2016 #1
    1. The problem statement, all variables and given/known data
    (In Matlab) The variables w and z are related by w=cos(n*acos(z)) and z=cos(acos(w)/n) for n = 1,2,3,4 plot w vs z over domain (-1,1).

    2. Relevant equations

    3. The attempt at a solution
    First I tried to substitute z into w and thought since I have a function which calls itself I'd use a recursive function but I don't have the initial conditions. Then I thought that since the domain is (-1,1) and z would be plotted on that axis I could make z equal to an array with endpoints -1 and 1 and then plug that array in for w. Then I'd simply plot(z, w). The coding part is not difficult it's just the thought process behind it.
  2. jcsd
  3. Nov 12, 2016 #2


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    Homework Helper

    Normally, if you are asked to plot w vs. z over (-1, 1), you let one variable (say z) range from -1 to 1, and plot the other (w) as your dependent variable. In this case, I would try both ways.
    Overlaying the two plots should show where both relations can be true at the same time.
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