# Sigismond Kmiecik

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 Oct1 comment Fitting ellipse to 5 given points on the plane Your ellipse definition is in fact the general equation of a conics - it is only an ellipse if the discriminant is negative. How does your answer take this restriction into account? Thanks Oct1 comment Fitting ellipse to 5 given points on the plane With MMA V9 I do not get the right answer, for example f (-0.275185 + 1. x^2 + x (0.189022 + 0.566953 y) + 0.1281 y + 0.397124 y^2) == 0 is the equation of the ellipse which is returned. The parameter f is not resolved. Sep26 comment Finding length of intersection of two surfaces On the contrary, to me your approach is quite elegant, concise with a flair for mathematics. And it works OK at least since MMA V5. Jul2 awarded Curious Jun10 accepted Combine a contour plot of a conic and an inset with an polygon such as all its vertices are on the conic Jun9 comment Combine a contour plot of a conic and an inset with an polygon such as all its vertices are on the conic @Kuba Correct! I didn't think about using {ColorData["Legacy", "Banana"], EdgeForm[{Thick, Pink}], Opacity[0.15], Polygon[{a, b, c, d}]} in the Epilog instead of Inset... to achieve the same result. Inset obviously here was a wrong option and I guess that finding correctly the right Size would have been challenging and futile. I consider your comment as an answer. Jun9 asked Combine a contour plot of a conic and an inset with an polygon such as all its vertices are on the conic May11 awarded Informed May6 accepted How to efficiently drag points on a curve within a Manipulate May6 comment How to efficiently drag points on a curve within a Manipulate Michael I understand your idea: the locator is the point that is dragged.When I manipulate your solution it seems that the locator is always precisely on the conics.But after having modified your answer by Appearance -> Style[".", 40, Red]] the point can be slightly off the conic and this baffles me. Any idea why ?(By the way there is a comma too much in your last line). See youtube.com/watch?v=h9VCsX54irM which gave me the idea to reproduce something similar with MMA (but far for me to compare Geogebra with MMA) . May5 comment How to efficiently drag points on a curve within a Manipulate @MichaelE2 Yes, you can update my question like that if you are sure that it can only be answered by restricting a locator (that I would like not to see). My question is more general and open I don't assume that restricting a locator is the only way, even if I started coding like that because I know of no other. Kuba gave me a nice answer based on restricting transparently a locator. May5 revised How to efficiently drag points on a curve within a Manipulate last paragraph reworded in order to make it more understandable. May3 revised How to efficiently drag points on a curve within a Manipulate redundancy of words May3 asked How to efficiently drag points on a curve within a Manipulate Mar22 comment Intersection of any triangle with a circle in Cartesian coordinates Yes, I start with 3 points for the triangle , 1 point for the centre of the circle, length of its radius. I could not find a way to write a single Solve between the equation of the circle and an analytic expression representing the triangle. Precision of the intersection points coordinates is very important. Mar22 revised Intersection of any triangle with a circle in Cartesian coordinates rewording of the first paragraph, to make clearer what my question is about Mar22 comment Intersection of any triangle with a circle in Cartesian coordinates The question is about getting the cartesian coordinates of the points where a circle intersects a triangle - with less code as here where I had to plot three lines and solve three equations, where each line intersects the circle. Mar21 asked Intersection of any triangle with a circle in Cartesian coordinates Mar2 accepted Implementing nested subtotals Mar2 comment Implementing nested subtotals thanks for your extended and adaptive answer which made discover the usefulness of FlipView. I thought about partly emulating the Excel pivot tables but it is a question too presumptuous to ask by a modest MMA user as myself who may not thoroughly understand any answer received.