Manipulate Command giving error

Question

Manipulate[
 Plot[a x^2 + b x + c, {x, -10, 10}, PlotRange -> {-50, 50}, 
  PlotLabel -> Row[{a x^2 + b x + c = y}]], {{a, .1}, -10, 10, 
  Appearance -> "Open"}, {{b, .1}, -10, 10, 
  Appearance -> "Open"}, {{c, .1}, -10, 10, Appearance -> "Open"}]

Then I am having this after evaluating:

Set::write: Tag Plus in 0.1 +0.1 x+0.1 x^2 is Protected.

What does this mean?

To expand slightly on @dionys comment, you will want to enclose the equation you are using as a plot label in quotes to make it a string and prevent Mathematica from trying to evaluate it by assigning values to the left hand side. — MarcoB, Sep 20 '15 at 17:00

score 1 · Answer 1 · answered Sep 20 '15 at 16:34

1

You have assign (=) instead of == in the:

{a x^2 + b x + c = y}

Just change this into and this will be fixed.

{a x^2 + b x + c == y}

answered Sep 20 '15 at 16:34

m0nhawk

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Manipulate Command giving error

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