You're randomizingYou need to randomize the wrong control parameterinitial value, not the name of the symbol associated to the control.
Perhaps this is what you want something like this instead:
Manipulate[
With[{f = Table[c[i], {i, n}], controls = Sequence @@ Table[{{c[i], s[i]}, -1, 1}, {i, n}]},
Manipulate[f,
controls,
Button["Random", Do[s[i] = RandomReal[{-1, 1}], {i, n}]]]],
{n, {3, 4, 5}}, Initialization -> {s@_ := 0}]
You're randomizing the wrong control parameter. Perhaps you want something like this instead:
Manipulate[
With[{f = Table[c[i], {i, n}], controls = Sequence @@ Table[{{c[i], s[i]}, -1, 1}, {i, n}]},
Manipulate[f,
controls,
Button["Random", Do[s[i] = RandomReal[{-1, 1}], {i, n}]]]],
{n, {3, 4, 5}}, Initialization -> {s@_ := 0}]
You need to randomize the control initial value, not the name of the symbol associated to the control.
Perhaps this is what you want:
Manipulate[
With[{f = Table[c[i], {i, n}], controls = Sequence @@ Table[{{c[i], s[i]}, -1, 1}, {i, n}]},
Manipulate[f,
controls,
Button["Random", Do[s[i] = RandomReal[{-1, 1}], {i, n}]]]],
{n, {3, 4, 5}}, Initialization -> {s@_ := 0}]
You're randomizing the wrong control parameter. Perhaps you want something like this instead:
Manipulate[
With[{f = Table[c[i], {i, n}], controls = Sequence @@ Table[{{c[i], s[i]}, -1, 1}, {i, n}]},
Manipulate[f,
controls,
Button["Random", Do[s[i] = RandomReal[{-1, 1}], {i, n}]]]],
{n, {3, 4, 5}}, Initialization -> {s@_ := 0}]