# Zooming in should not move a point over a curve

heldergeovane shared this question 10 months ago
Answered

Hi!

Consider the following construction:

eq1: x² + y³ = 1

A=Point(eq1)

I would like to zoom in around the point A, but when I do so the point moves to some other place. Sometimes, the new position is not even over the curve. Why is that happening? Is it possible to avoid this behaviour?

Files: test.ggb

## Comments (3)

1

Hi heldergeovane,

hmm, why do you think, that A is ONE point?

It isn't - every point on your implicit curve given by eq1 "is" A.

2

point(eq1) is two values internally, it is point(eq1,pathparameter) pathparameter is a number from 0 to 1 and 0 means begining and 1 means end

eq1 has different beging and end when you zoom so A is different point

if you want control this changes you can use another way for restricting the point in curve like dynamiccoords

Files: foro.ggb
1

you can try

f(x)=cbrt(1-x^2)

point(f)

the functions are parameterized in a standard form by xAxis

Leave a Comment
• GeoGebra
• Help
• Partners
• Contact us
• Feedback & Questions
• This email address is being protected from spambots. You need JavaScript enabled to view it.
• +43 677 6137 2693
© 2020 International GeoGebra Institute