I have this function

enter image description here

With 3 constants, R, c, and V. The question I have in hand is to show how the solution curve changes as the parameters change so I need to plot this function with several different value of each constant, other than plotting each function many times is there a way to plot this function just once with a slider to be able vary the constants? I tried looking Plot[Table and Manipulate function but that didn't help me a lot. I also tried looking into the plot function. How can I plot this function?


1 Answer 1


One way might be to use Manipulate

enter image description here

 sol = q[t] /. 
   First@DSolve[{r q'[t] + q[t]/c == v, q[0] == ic}, q[t], t];
   {Plot[sol, {t, 0, maxT}, PlotRange -> {{0, maxT}, {0, maxQ}}, 
     ImagePadding -> 40, ImageSize -> 300, Frame -> True, 
     FrameLabel -> {{"q(t)", None}, {"t", "Solution to the problem"}},
      GridLines -> Automatic, GridLinesStyle -> LightGray, 
     PlotStyle -> Red]

 {{c, 1.6, "c"}, 0, 2, .1, Appearance -> "Labeled", ImageSize -> Tiny},
 {{r, .1, "r"}, .1, 2, .1, Appearance -> "Labeled", ImageSize -> Tiny},
 {{v, 1.5, "c"}, .1, 2, .1, Appearance -> "Labeled", ImageSize -> Tiny},
 {{ic, 1, "q[0]"}, 0, 2, .1, Appearance -> "Labeled", ImageSize -> Tiny},
 {{maxT, 1, "time scale"}, 1, 100, .1, Appearance -> "Labeled", ImageSize -> Tiny},
 {{maxQ, 3, "y scale"}, .1, 10, .1, Appearance -> "Labeled", ImageSize -> Tiny}
  • $\begingroup$ For some reason everytime I use the Manipulate function it gives me the definition of the word Manipulate instead, what am I doing wrong? its on Mathematica web $\endgroup$
    – method
    Apr 19, 2017 at 5:49
  • 1
    $\begingroup$ @method it is here reference.wolfram.com/language/ref/Manipulate.html I find using google search "Mathematica manipulate" $\endgroup$
    – Nasser
    Apr 19, 2017 at 5:51
  • $\begingroup$ here's what I am getting i.imgur.com/QFvjBsK.png, I have tried to use a function from the reference link and it seemed to work but I tried to hand write the one you gave me too still getting the definition $\endgroup$
    – method
    Apr 19, 2017 at 6:06
  • 1
    $\begingroup$ @method I do not use Mathematica online, so I am not sure why it does not work there. so I can't really help on that. I use Wolfram Mathematica desktop (on the PC) not on the cloud one. May be someone else knows why it does not work on Wolfram online. $\endgroup$
    – Nasser
    Apr 19, 2017 at 6:15
  • 2
    $\begingroup$ @method In the image you linked that first orange equal sign is suspicious. It means you are calling WolframAlpha and I think you don't need this. I have tried @Nasser Manipulate code in online programing lab and it works. $\endgroup$
    – Pinti
    Apr 19, 2017 at 7:58

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