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I am trying to do a manipulate with a function that depends on several variables, some of which are also functions. I can't get it to work. I have tried including an "Initialization" but it only accepts a function with a single variable. For example, if I build the following manipulate, it works:

enter image description here

However, if A now depends on two variables, "v" and "q", then it doesn't work.

enter image description here

How could I do it? Thank you very much for your help.

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  • $\begingroup$ Please post actual, copyable input code instead of images of code! $\endgroup$
    – murray
    Dec 24, 2021 at 17:21

1 Answer 1

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Try:

a = 2 v q;

Manipulate[Plot[f[v, q], {x, 14, 17}],
 {{v, 1}, 0.5, 9, 0.1}, {{q, 1}, 1, 15, 0.1},
 Initialization :> {f[v_, q_] = a x}]

Or simpler:

Manipulate[
 a = 2 v q;
 Plot[a x, {x, 14, 17}],
 {{v, 1}, 0.5, 9, 0.1}, {{q, 1}, 1, 15, 0.1}]
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  • $\begingroup$ Thank you very much Daniel. And if now for example q were a function of another variable, in initizalitazion I should put all the variables. $\endgroup$
    – Manu
    Mar 29, 2021 at 9:42
  • $\begingroup$ Can you make an example? $\endgroup$
    – Daniel Huber
    Mar 29, 2021 at 9:48
  • $\begingroup$ Now, v and q are functions of b and c, respectivelly. a = 2 v q; v = 3 + b q = 2 c; Manipulate[ Plot[f[b, c], {x, 14, 17}], {{b, 1}, 0.5, 9, 0.1}, {{c, 1}, 1, 15, 0.1}, Initialization :> {f[c_, b_] = a*x}] $\endgroup$
    – Manu
    Mar 29, 2021 at 9:54
  • $\begingroup$ 3 + b q = 2 c; is a syntax error. Do you mean: v= 2 c ? Further, if "v and q are functions of b and c" you should specify: v=.., c=.. $\endgroup$
    – Daniel Huber
    Mar 29, 2021 at 10:52
  • $\begingroup$ Sorry, I want write that a = 2 vq; v = 3 + b; q = 2 c; a is a function of v and q. On the other hand, v is function of b and q is function of c. I have probe the code that I indicated you before and it work. $\endgroup$
    – Manu
    Mar 29, 2021 at 11:04

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