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passing expressions to curve() within a function


passing expressions to curve() within a function

By : user2955414
Date : November 22 2020, 10:40 AM
I hope this helps you . I didn't mean to ask-and-then-answer, but I figured out the (an?) answer with a little bit more poking around -- it occurred to me that I hadn't tried eval yet. eval(curve(substitute(g),from=0,to=3)) does not work, but this does:
code :
f1 <- function(g) {
     eval(substitute(curve(g,from=0,to=3)))
}
f1(x^2)
f2 <- function(g) {
    do.call(curve,list(substitute(g),from=0,to=3))
}
f2(x^2)


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As3 Function for extrapolating points on a spline curve or Hermite Curve similar to keframe interpolation?

As3 Function for extrapolating points on a spline curve or Hermite Curve similar to keframe interpolation?


By : John BanoET
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further The equation for the Hermite Curve is this:
(via Wikipedia)
code :
        /*
         * Computes x,y values for a given traversal of a Hermite Curve
         * @param t:Number - a normalized value (0.0 to 1.0) describing path traversal
         * @param points:Array - an array contining the 4 points describing the curve (P0,T0,P1,T1 - always in this order)
         * Anchor points are relative to they're control points
         */
        private function hermite(t:Number,points:Array):Point{
            var result:Point = new Point();
            result.x = (2 * Math.pow(t,3) - 3 * t * t + 1) * points[0].x+
                        (Math.pow(t,3) - 2 * t * t + t) * points[1].x + 
                        (- 2 * Math.pow(t,3) + 3*t*t) * points[2].x +
                        ( Math.pow(t,3) - t*t) * points[3].x;
            result.y = (2 * Math.pow(t,3) - 3 * t * t + 1) * points[0].y+
                        (Math.pow(t,3) - 2 * t * t + t) * points[1].y + 
                        (- 2 * Math.pow(t,3) + 3*t*t) * points[2].y +
                        ( Math.pow(t,3) - t*t) * points[3].y;
            return result;
        }
private function quad(t:Number,p:Array):Point{
            var result:Point = new Point();
            var oneMinusTSq:Number = (1-t) * (1-t);
            var TSq:Number = t*t;
            result.x = oneMinusTSq*p[0].x+2*(1-t)*t*p[1].x+TSq*p[2].x;
            result.y = oneMinusTSq*p[0].y+2*(1-t)*t*p[1].y+TSq*p[2].y;
            return result;
        }
package {
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.events.MouseEvent;
    import flash.geom.Point;

    /**
     * @author george
     */
    public class BasicQuad extends Sprite {
        private var p0:Point = new Point(0,0);
        private var p1:Point = new Point(80,50);
        private var p2:Point = new Point(100,100);
        private var pts:Array = [p0,p1,p2];
        private var t:Number = 0;
        private var pt : Point;

        public function BasicQuad() {
            init();
        }
        private function init():void{
            stage.doubleClickEnabled = true;
            stage.addEventListener(MouseEvent.DOUBLE_CLICK, reset);
            reset();
        }
        private function reset(event : MouseEvent = null) : void {
            graphics.clear();
            graphics.lineStyle(3,0x009900,.5);
            t = 0;
            this.addEventListener(Event.ENTER_FRAME, draw);
        }
        private function draw(event : Event) : void {
            trace(t,pt);
            pt = quad(t, pts);
            if(t == 0) graphics.moveTo(pt.x,pt.y);//draw
            graphics.lineTo(pt.x,pt.y);
            t+= 0.015;
            if(t >= 1) removeEventListener(Event.ENTER_FRAME, draw);//done
        }
        private function quad(t:Number,p:Array):Point{
            var result:Point = new Point();
            var oneMinusTSq:Number = (1-t) * (1-t);
            var TSq:Number = t*t;
            result.x = oneMinusTSq*p[0].x+2*(1-t)*t*p[1].x+TSq*p[2].x;
            result.y = oneMinusTSq*p[0].y+2*(1-t)*t*p[1].y+TSq*p[2].y;
            return result;
        }
    }
}
function quadLerp(t:Number,p:Array):Point {
            var p1:Point = Point.interpolate(p[1], p[0], t);
            var p2:Point = Point.interpolate(p[2], p[1], t);
            return Point.interpolate(p2, p1, t);
        }
private function getYforX(x:Number,pts:Vector.<Point>):Number{
            var numPts:int = pts.length;
            for (var i : int = 1; i < numPts; i++) {
                if(x > pts[i-1].x && x < pts[i].x) {//find the line on which the cursor lies
                    t = (x-pts[i-1].x)/(pts[i].x-pts[i-1].x);//ratio between the x distance from the start of the line to mouseX and the whole line (end.x-start.x)
                    return pts[i-1].y + ((pts[i].y-pts[i-1].y) * t);//Thales similar triangles version, cheaper version of Point.interpolate(pts[i], pts[i-1], t).y; 
                }
            }
            return -1;
        }
package {
    import flash.events.*;
    import flash.display.*;
    import flash.geom.Point;

    public class LerpPoints extends Sprite {

        private var path:Shape = new Shape();
        private var cursor:Shape = new Shape();
        private var numPts:int = 11;
        private var pts:Vector.<Point> = new Vector.<Point>(numPts,true);
        private var t:Number = 0;

        public function LerpPoints() {
            init();
        }
        private function init():void{
            cursor.graphics.lineStyle(10,0x009900);
            cursor.graphics.drawCircle(-3, -3, 3);
            cursor.graphics.lineStyle(1,0x000099);
            cursor.graphics.moveTo(0, -stage.stageHeight);
            cursor.graphics.lineTo(0, stage.stageHeight);
            reset();
            addChild(path);addChild(cursor);
            addEventListener(Event.ENTER_FRAME, update);
            stage.addEventListener(MouseEvent.MOUSE_DOWN, reset);
        }
        private function reset(event:Event = null):void{
            path.graphics.clear();
            for (var i : int = 0; i < numPts; i++) {
                pts[i] = new Point(i*55,Math.random() * 200);//generate points
                path.graphics.lineStyle(3,0);
                if(i == 0) path.graphics.moveTo(pts[0].x,pts[0].y);//draw path
                path.graphics.lineTo(pts[i].x,pts[i].y);
                if(i > 0){//right angled triangles
                    path.graphics.lineStyle(1,0x990000);
                    path.graphics.lineTo(pts[i-1].x,pts[i].y);
                    path.graphics.lineTo(pts[i-1].x,pts[i-1].y);
                    path.graphics.moveTo(pts[i].x,pts[i].y);
                }
            }
        }
        private function update(event:Event):void{
            cursor.x = mouseX;
            cursor.y = getYforX(mouseX, pts);
        }
        private function getYforX(x:Number,pts:Vector.<Point>):Number{
            var numPts:int = pts.length;
            for (var i : int = 1; i < numPts; i++) {
                if(x > pts[i-1].x && x < pts[i].x) {//find the line on which the cursor lies
                    t = (x-pts[i-1].x)/(pts[i].x-pts[i-1].x);//ratio between the x distance from the start of the line to mouseX and the whole line (end.x-start.x)
                    return pts[i-1].y + ((pts[i].y-pts[i-1].y) * t);//Thales similar triangles version, cheaper version of Point.interpolate(pts[i], pts[i-1], t).y; 
                }
            }
            return -1;
        }
    }
}
How to use the function curve in [R] to graph a normal curve?

How to use the function curve in [R] to graph a normal curve?


By : DanielTheNerd99
Date : March 29 2020, 07:55 AM
I hope this helps you . I'm trying to make a histogram in [R], and the normal curve that describes the histogram as follows: , You just need to drop the "w" argument to dnorm in curve:
code :
w<-rnorm(1000) 
hist(w,col="red",freq=F,xlim=c(-5,5))
curve(dnorm,-5,5,add=T,col="blue")
w<-rnorm(1000, mean=10, sd=2) 
hist(w, col="red", freq=F, xlim=10+c(-5,5))
curve( dnorm(x, mean=10,sd=2), 5, 15, add=T, col="blue")
AngularJS Passing Expressions Into Function

AngularJS Passing Expressions Into Function


By : Sachin Hegde
Date : March 29 2020, 07:55 AM
hop of those help? If you want to pass along this data, try removing the {{}} so the call will just look like
code :
ng-click="commentPopup(comment.comment_id)"
Passing expressions by reference inside expressions

Passing expressions by reference inside expressions


By : CreepyStalker2107
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , mat3 will reflect the mutation of mat1 and mat2, but not rebinding of mat1 and mat2. It is important to understand the distinction between mutation and rebinding.
Mutation
code :
A = [1, 2, 3]
A[1] = 4
A = :(f(x))
A.args[1] = :g
mat1 = :(f(x))
mat2 = :(f(y))
mat3 = :($mat1 + $mat2)
mat1.args[1] = :g
x = 2
x = 3
A = [1, 2, 3]
A = [4, 2, 3]
mat1 = :x
mat2 = :y
mat3 = :($mat1 + $mat2)
mat1 = :z
mat1 = :x
mat2 = :y
mat3() = :($mat1 + $mat2)  # function definition
mat3()  # :(x + y)
mat1 = :z
mat3()  # :(z + y)
React error Expected an assignment or function call and instead saw an expression no-unused-expressions while passing pr

React error Expected an assignment or function call and instead saw an expression no-unused-expressions while passing pr


By : user2759395
Date : March 29 2020, 07:55 AM
To fix the issue you can do Look at the render method, in the else branch you create a MovieItem component, but you don't do anything with it. Looking at your code, I guess you need to assign it to movieItem variable, so it gets than rendered in the p element.
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