How to delete an element of a nested list at a specific level and a specific position of this level

(*source*)
sourceStruct =
 {{a, {{c1, d}, {e, f}}}, {b, {{c2, h}, {i, k}}}, {m, {{c3, n}, {v,x}}}}
(*target*)

targetStruct = {{a, {{d}, {e, f}}}, {b, {{h}, {i,k}}}, {m, {{n}, {v, x}}}}
(*try 1*)
Apply[Function[x, Delete[x, 1]], Level[sourceStruct, {2}], {1}]
(*result 1*)
{a, {d}, b, {h}, m, {n}}
(*try 2*)
Map[Function[x, Delete[x, 1]], sourceStruct, {3}]
(*result 2*)
{{a, {{d}, {f}}}, {b, {{h}, {k}}}, {m, {{n}, {x}}}}

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plotting - How to draw lines between specified dots on ListPlot?

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equation solving - Invert and fit implicitly defined curve

I need to fit an implicitly defined curve. I thought I could get some data out of Solve , and then using FindFit . Therefore, I would like to find the relation the parametric curve defined by $F(x,y)=0$: Solve[-(1/2) + 1/2 (0.41202 BesselK[0, 0.1 Sqrt[x^2 + y^2]] + (0.101483 x BesselK[1, 0.1 Sqrt[x^2 + y^2]])/Sqrt[x^2 + y^2]) == 0, y] But I can't get an output: Solve was unable to solve the system with inexact coefficients or the system obtained by direct rationalization of inexact numbers present in the system. Since many of the methods used by Solve require exact input, providing Solve with an exact version of the system may help. >> Edit: In particular, I would like to fit the data coming from the curve with the expression of another curve, and not with a function $f(x)$. In particular, since this clearly looks like a cardioid , I would like it to fit to something like it. What other strategies could I try?

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I would like to create a dynamic ArrayPlot so that the rectangles, when clicked, provide the input. Can I use ArrayPlot for this? Or is there something else I should have to use? Answer ArrayPlot is much more than just a simple array like Grid : it represents a ranged 2D dataset, and its visualization can be finetuned by options like DataReversed and DataRange . These features make it quite complicated to reproduce the same layout and order with Grid . Here I offer AnnotatedArrayPlot which comes in handy when your dataset is more than just a flat 2D array. The dynamic interface allows highlighting individual cells and possibly interacting with them. AnnotatedArrayPlot works the same way as ArrayPlot and accepts the same options plus Enabled , HighlightCoordinates , HighlightStyle and HighlightElementFunction . data = {{Missing["HasSomeMoreData"], GrayLevel[ 1], {RGBColor[0, 1, 1], RGBColor[0, 0, 1], GrayLevel[1]}, RGBColor[0, 1, 0]}, {GrayLevel[0], GrayLevel...

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