# Auto generate parameters in Manipulate

I have a manipulation problem that I can't find a solution online. Here is a simple example from my case.

constraint = RandomInteger[{1, 10}];
L1 = k RandomReal[{-10, 10}, {1, constraint}];
L2 = Table[{Subscript[b, i]}, {i, 1, constraint}];
y = Total[Flatten[L1.L2]]
With[{y = y},
Manipulate[
Plot[y, {k, 1, 10}],
{Subscript[b, 1], 0, 1},
{Subscript[b, 2], 0, 1},
{Subscript[b, 3], 0, 1},
{Subscript[b, 4], 0, 1},
{Subscript[b, 5], 0, 1},
{Subscript[b, 6], 0, 1},
{Subscript[b, 7], 0, 1},
{Subscript[b, 8], 0, 1},
{Subscript[b, 9], 0, 1},
{Subscript[b,,10], 0, 1}]]


My question is that is there a way to auto generate the parameters in Manipulate according to my constraint?

I feel like there is a duplicate, but I was not able to find this. This one is related e.g: 1199

All you need is:

With[{y = y},
Manipulate[
Plot[y, {k, 1, 10}],
Evaluate @ Array[{Subscript[b, #], 0, 1} &, constraint, 1, Sequence]
]]


You sould be able to figure it out with documentation. Evaluate is for the same purpose as your With.

p.s. It is good habit to not use Subscripts.

• @user11726 No problem, good luck. :) p.s. there is no need to accept immediately, you can always upvote (if you find answer useful) and accept later, maybe even different answer. Please, take a tour – Kuba Feb 10 '15 at 10:10