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Questions tagged [curves]

129 questions
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Curve Fitting for equation with two parameters

I have two arrays: E= [6656400; 13322500; 19980900; 26625600; 33292900; 39942400; 46648900; 53290000] and J=[0.0000000021; 0.0000000047; 0.0000000128; 0.0000000201; 0.0000000659; 0.0000000748; …
Hisham Alghamdi
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How to parse photoshop curve file(.acv) to get the rgb values?

this is my first post in stackoverflow. So I have these custom .acv files from photoshop, what I want to do is I am trying to filter a bitmap using colormatrix. To do that, I am parsing those .acv files to get its rgb values to be used by the…
lombee
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Animate an element to move between 2 elements in a dynamically created curved path

I've been trying to do this for a project and i failed on every try. The image says it all. The idea is to create a script to: Select Start Point and Ending Point elements. Move "bee" between this 2 elements in a certain time when the function is…
Lucas Rabello Simões
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Get Bézier curve coordinates calculated by glMapGrid1d/glEvalMesh1

I am using glEvalMesh1() to calculate the coordinates of a Bézier curve and draw the curve. To be honest I had a hard time finding out how this function works because I am a complete newbie in 3D graphics. Now I managed to draw the curve this…
Tamás
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Cocos2d Touch Bezier (cocos2d V3)

There is a way to create chipmunk shape (physic body) from touches (curves)? I mean, that I can just create some shape from points, but there is a limitation to the number of vertices and the shape of the figure is angular, rather than convex. I…
Kikiki
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Intersection of two Bézier curves (or two curves and a line): code?

Checking if two cubic Bézier curves intersect gives a link to http://cagd.cs.byu.edu/~557/text/ch7.pdf .. sounds readable on first pass.. but it is not code. I am wondering if someone has actually implemented this algorithm in any common programming…
Agamemnus
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B spline basis function seems to produce incorrect values

i wanted to implement B-splines in an Java Swing application. And since 4. May i tried nearly everything and spend every minute of my free time, but i don't get them right - i have headach since yesterday :/ To implement the B spline i used the…
Soraphis
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Solve or plot the reverse of an equation in R

I plotted an expression curve, i.e.curve(-log((1-x)/0.9999)/x,ylim=c(0,4)). However, I want to see the reverse relationship, i.e. y changes over x instead of x changes over y. Are there any R function can plot it automatically? Or a function that…
Verbal
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Writing a code for nonlinear parameter estimation problems

I am struggling in finding a way to write a code which can let me do the following: I have a nonlinear ODE called fy. fy = g1*p1+g2*p2+g3*p3; % g1,g2,g3 are real-valued numbers and p1,p2,p3 are vectors g1, g2 and g3 are constants found by the…
Sergio Haram
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Matrix Size in Matlab

I have two curves with sizes: size(A) = 1 312 and size(B) = 312 When subtsracting A from B, I got this error message Error using ==> minus Matrix dimensions must agree. Can this error be attributed to the order of the matrices where the values…
Samjella Billa
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Implementing Catenaries and related curves

Hello first of all I would just like to say that I wouldn't like the answer I would just like to know the method of doing these kinds of equations, because I have been asked to implement this into a macro for excel and have difficulty understanding…
user2970001
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How to drag curves in processing

I have a xy plot in which I have a straight line. I'm able to drag lines by using mouseX and mouseY values, but I would like to do this for curves. Firstly how do I make a curve, when I only have co-ordinates for a point and then how can I drag it?
gizgok
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How to generate random points around the curves of characters using processing?

I would like to generate random/noise points along each character of a multiple line text. I've tried this with the Geomerative library, but unfortunately it does not support multi line. Any other solution?
rjth
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Draw a Smooth Vector Curve Through Close Points using Raphael.js

I'm having trouble drawing a smooth curve through a series of close points using Raphael.js. I've tried all of the curve types except for elliptical and they come out with "bumpy" curves. see this url showing the image:…
user1592257
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Multiple curves with same Time x-axis in R

Could-you help me please in solving this issue. In fact, i would like to plot multiple curves on the same graph on R with a x-axis which is time labeled. I tried this : dayTime = strptime(sapply(c(0:110)+480,…
user1646105
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