Hi,
I am trying to Plot a vector with variables coordinates. I could already manage to plot a arrow between two points but now i want to change them preferable direct in the Plot.
point1 := {0, 0} point2[r_] := {5, r} Manipulate[ Graphics[Arrow[{point1, point2[r]}]], {r, -3, 3}]
I am getting always the error " Tag list is Protected
Hope you can help me.
What about this?
Manipulate[ Function[{a, b, c}, Graphics3D[Arrow[{{0, 0, 0}, {a, b, c}}], PlotRange -> {{0, 3}, {0, 3}, {0, 3}}]][x, y, z], {x, 0, 3}, {y, 0, 3}, {z, 0, 3}]
You could also use this:
Remove["Global`*"]
It clears all previous definitions. In your case not only r but also point1 and point2.
r
point1
point2
Note the backtick ` after Global .
Hi Mike,
Thanks for your response.
...You are right. I used the the command
ClearAll
but it seems that this one doesn't work. So i tried it with
Clear[r]
and it worked.
Thank you.
Wow. I will have to remember that.
Timo:
What version of Mathematica are you using? I'm using 12.1 and the code you posted works for me.
That said, I did a little experiment and noticed that if I have r already defined, I do get the error you get. So, I suggest restarting your kernel and see if that "fixes" it.
I'm just learning the Manipulate function, but one thing I have noticed (at least for me) is that I have to watch for symbol name conflicts. That said, I do not see what the issue is with the code you have.
I have to jump on some conference calls. If no one else finds a solution before I can get back to this, I will experiment some more this afternoon.
Thank you for the great question.
I solved it by myself^^. The Problem is that you cannot put a variable in a vector but you can always multible a variable with a vector. The solution looks like:
point1 = {0, 0} point2[r_] = {5, 0} + r*{0, 1} Manipulate[Graphics[Arrow[{point1, point2[r]}]], {r, 0, 3}]
