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Here's a simple Manipulate example:

f[x_, a_, b_] := a x + b
 Plot[f[x, u[[1]], u[[2]]], {x, -1, 1}, 
 PlotRange -> {-1, 1}], {{u, {1, 0}, "a/b"}, {-1, -1}, {1, 1}}]

enter image description here

I would like to be able to control a and b with individual 1D sliders as well, such that all controls are dynamically updated. How can I achieve this?

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I wouldn't consider it a duplicate since the other post wouldn't have gotten me all the way there. – bdforbes Jul 18 '13 at 16:15
I agree, I have revised my thoughts. Closely related – Kuba Jul 18 '13 at 17:32
up vote 5 down vote accepted

You can put almost any object into the controller area of a Manipulate, even separately from the controls automatically managed by Manipulate. In other words, in that case you can do something like

           Plot[f[x, u[[1]], u[[2]]], {x, -1, 1}, PlotRange -> {-2, 2}],
           {{u, {1, 0}, "a/b"}, {-1, -1}, {1, 1}},
           Column[{Labeled[Slider[Dynamic[u[[1]]], {-1, 1}], "a = " Dynamic[u[[1]]], Left],
                   Labeled[Slider[Dynamic[u[[2]]], {-1, 1}], "b = " Dynamic[u[[2]]], Left]
           Initialization :> {f[x_, a_, b_] := a x + b}]

enter image description here

So, you don't really need to manually specify the Slider2D control, just add a couple of Dynamic sliders with same values of the original controller managed by Manipulate. As you can see I also included the function f definitions inside the Manipulate box by means of the Initialization options. So, the box is fully independent by the external definitions. Otherwise a SaveDefinitions->True should be used.

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I should have tried this. It is much better this way if we do not want to use DynamicModule. I will delete my answer since there is nothing new over the link I've added. Yours should be accepted :) +1 – Kuba Jul 18 '13 at 11:06

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