Here is my attempt to manipulate the value of q for the PDF function. Whenever I use the manipulate function, nothing happens to the output. Can anyone explain why?
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3 Answers
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You have many code errors, such as the error in defining a function G[x_]= instead of G[x_]:=, the fact that sigma cannot have a value (because q is not assigned), missing semicolons, and much more.
I presume you're lifting my code from here.
Anyway, here is your answer:
Manipulate[
Integrate[
PDF[
NormalDistribution[0, -q Log[2, q] - (1 - q) Log[2, 1 - q]], x],
{x, 0, 1}],
{q, .1, .3}]
answered Sep 15, 2018 at 20:20
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$\begingroup$ Yes, I was the one who asked the previous question as well. $\endgroup$– sde7Sep 15, 2018 at 20:28
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1$\begingroup$ ...and never accepted my previous answer. $\endgroup$ Sep 15, 2018 at 20:32
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You have a variable scoping problem. The global q that appears in your definition of sigma is not the same as the local q that appears in your Manipulate expression. One way to fix it is:
sigma[q_] := -q Log2[q] - (1 - q) Log2[1 - q]
g[q_][x_] := PDF[NormalDistribution[0, sigma[q]], x]
Manipulate[g[q][x], {q, .0001, 1}]
answered Sep 15, 2018 at 20:14
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Manipulate doesn't "see" the q term in the argument.
To fix this use
Manipulate[PDF[NormalDistribution[0, sigma], x] /. q -> Q, {Q, 0, 1}]
Or make sigma a function of q as
sigma[q_] := -q Log[2, q] - (1 - q) Log[2, 1 - q]
Manipulate[PDF[NormalDistribution[0, sigma[q]], x], {q, 0, 1}]
answered Sep 15, 2018 at 20:11
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$\begingroup$ I made this change. It does work. However, part of the input is to integrate the PDF function G[x]. It does not make the change in Out[54] whenever I manipulate q. Any ideas? $\endgroup$– sde7Sep 15, 2018 at 20:23