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Problem with ParametricPlot and Manipulate

tt5 kk6
Posted 10 years ago

Hey, I tried to use ParametricPlot with these to functions and manipulate the result:

f[a_, r_, t_, v_, w_] := v t (1 + (1/(1 - (r/a) Cos[w t])))
g[a_, r_, t_, v_, w_] := (r Sin[w t])/(1 - (r/a) Cos[w t])
Manipulate[ParametricPlot[{f[t], g[t]}, {t, 0, 10}], {r, 0, a - 1}, {a, 1, 20}, {v, 0, 20}, {w, 0, 20}]

The result doesnt show at all and manipulating a,r,v,w doesnt change anything. I know this is probably a simple mistake but iam very new to this program. Iam new in this community aswell and dont know if i post this at the right place.

But thanks in advance to everyone trying to help me.
POSTED BY: tt5 kk6
2 Replies
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tt5 kk6
tt5 kk6
Posted 10 years ago

Ahh okay thanks very much
POSTED BY: tt5 kk6

The function definition of f and g do not match the call.

Something like this seems to work

f[a_, r_, t_, v_, w_] := v t (1 + (1/(1 - (r/a) Cos[w t])))
g[a_, r_, t_, v_, w_] := (r Sin[w t])/(1 - (r/a) Cos[w t])
Manipulate[
 ParametricPlot[{f[a, r, t, v, w], g[a, r, t, v, w]}, {t, 0, 10}],
 {r, 0, 1},
 {a, 1, 20},
 {v, 0, 20},
 {w, 0, 20}
 ]

enter image description here
POSTED BY: Nasser M. Abbasi
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