Nix add variadic args to a set from a function - functional-programming

Is something like this possible in nix?
f = {x, y, ...}:
{
x = x + 1;
y = y + 2;
...;
}
where calling f on a set of arguments returns a set:
f { x = 1; y = 2; } -> { x = 2; y = 4; }
f { x = 1; y = 2; z = 5 } -> { x = 2; y = 4; z = 5; }
f { x = 1; y = 2; z = 5; s = "str"; } -> { x = 2; y = 4; z = 5; s = "str"; }
To be clear. The set of ellipsis ... is the variadic argument type and does not mean etcetera used in everyday language. The solution here is to call get { ... } on ellipsis if possible. But I don't know if the language supports this.


This should work:
f = args#{x, y, ...}: args // { x = x + 2; y = y + 2; }
You can read more about it here:
https://nixos.org/nix/manual/#ss-functions

Related

Tic-Tac-Toe Turbo C

Please I'm trying to make a simple game of tic-tac-toe but I kept getting an error. It says Error Syntax and while statement if missing ) . I would be happy if you someone could help 'cause I just started studying how to code. Here's the code btw.
#include<stdio.>
char sqr [3][3]
main()
{
char again;
int moveCntr, winFlag;
while (1 = = 1)
{
initliz();
sqr[1][1] = 'X';
disbord();
getmove();
makemove();
moveCntr = 3;
while(1 = = 1)
{
disbord();
getmove();
moveCntr = moveCntr + 1;
winFlag = Checkwin ('0');
if(winFlag = = 1)
{
dispbord();
printf("Congratulations!! You win.\n");
break();
}
else
{
makemove();
winFlag = checkwin ('X');
if(winFlag = = 1)
{
dispbord();
printf("I win.\n");
break;
}
}
moveCntr = moveCntr + 1;
if(moveCntr = = 9)
{
dispbord();
printf("It's a draw. Good game.\n");
}
else
{
continue;
}
}
printf("\nDo you want to play again (Y/N)?");
scanf("\n%c" ,&again);
if(again = = 'Y' || again = = 'y')
{
continue;
}
else
{
break;
}
}
return 0;
}

making Console::WriteLine(x) in the same line when looped in CLR console C++

I'm trying to create a pascal triangle using stdafx.h.
I come to a problem when trying to put a Console::WriteLine(x) using a loop but wanting it in the same line
I "translated" this from a Iostream C++ empty project
#include "stdafx.h"
using namespace System;
int main(array<System::String ^> ^args)
{
int k, i, x, a, b, c, d, e, f, g, h;
Console::WriteLine(L"Number of Rows : ");
String^ strabx = Console::ReadLine();
int n = int::Parse(strabx); //the number of rows
d = 0;
g = 0;
for (i = 0; i <= (n - 1); i++) // i adalah baris
{
for (a = (n - i); a >= 1; a--) {
Console::WriteLine(" ");
}
x = 1;
b = 0;
e = 0;
f = 0;
k = 0;
do
{
f = f + x;
Console::WriteLine(" " + x + " "); //my problem lies here
x = x * (i - k) / (k + 1);
b = b + 1;
k++;
} while (k <= i);
c = b;
d = d + c;
g = f + g;
Console::WriteLine();
}
Console::WriteLine("digit count " + d + "\n");
Console::WriteLine("sums of the number : " + g);
Console::ReadLine();
Console::WriteLine();
}

Use Console::Write() instead.
Console::Write(" " + x + " ");

JavaFX Dynamically add Nodes to pane with fx:id or id

I can create Nodes on a pane with a for next loop, but do not have the ability
to assign these nodes a fx:id or a id
Is this possible number one? If so what do I need to add to my code?
Or do I have the option to write the information to a FXML file with the for next loop?
private void MakeNode(){
for (int A = 1; A <= 42; A++){
if(A==1){
X=40;
Y=40;
}else if(A>1 && A<=7){
X = X + 120;
Y = 40;
}else if(A==8){
X = 40;
Y = 160;
}else if(A>8&& A<=14){
X = X + 120;
Y = 160;
}else if(A==15){
X = 40;
Y = 280;
}else if(A>15&& A<=21){
X = X + 120;
Y = 280;
}else if(A==22){
X = 40;
Y = 400;
}else if(A>22&& A<=28){
X = X + 120;
Y = 400;
}else if(A==29){
X = 40;
Y = 520;
}else if(A>29&& A<=35){
X = X + 120;
Y = 520;
}else if(A==36){
X = 40;
Y = 640;
}else if(A>36&& A<=42){
X = X + 120;
Y = 640;
}
cirA = new Circle(X,Y,16);
//fxid = cir.concat(String.valueOf(A));
//fxid = cir+String.valueOf(A);
//cirA.setId(fxid);
cirA.setFill(Color.YELLOW);
cirA.setStroke(Color.BLACK);
cirA.setStrokeWidth(4.0);
pane.getChildren().add(cirA);
}
}

fx:id is just a mechanism for getting a reference to elements defined in FXML to the controller. If you are defining nodes in the controller anyway, there is no need for (or indeed, no way to use) fx:id at all.
You already have a reference to the Circle when you create it. So just do whatever you need right there. Here's a simple example (I cleaned your code up to make it much less verbose):
private void makeNode() {
for (int circleIndex = 0 ; circleIndex < 42 ; circleIndex++) {
int column = circleIndex % 7 ;
int row = circleIndex / 7 ;
double x = 40 + 120 * column ;
double y = 40 + 120 * row ;
Circle circle = new Circle(x, y, 16);
circle.setFill(Color.YELLOW);
circle.setStroke(Color.BLACK);
circle.setStrokeWidth(4.0);
pane.getChildren().add(circle);
circle.setOnMouseClicked(e -> {
System.out.println("Clicked on ["+column+", "+row+"]");
});
}
}

Function Plotter error in Dart (with three.dart): Breaking on exception: The null object does not have a method 'crossInto'

The calculations are done in the following code:
var MIN = -10.0,
MAX = 10.0,
RANGE = MAX - MIN;
getColor(max, min, val) {
var MIN_L = 40,
MAX_L = 100;
var color = new Color();
var h = 0 / 240;
var s = 80 / 240;
var l = (((MAX_L - MIN_L) / (max - min)) * val) / 240;
color.setHSL(h, s, l);
return color;
}
initGraph() {
var x = MIN,
y = MIN,
z = 0.0;
initData() {
var data = [];
for (var i = MIN; i < MAX; i++) {
var row = [];
for (var j = MIN; j < MAX; j++) {
double z = 2*( x * x + y * y);
print('$z');
row.add({
x: x,
y: y,
z: z
});
y++;
}
data.add(row);
x++;
}
return data;
}
var data = initData();
var geometry = new Geometry();
var colors = [];
var RANGE = data.length,
height = data[0].length;
data.forEach((col) {
col.forEach((val) {
geometry.vertices.add(new Vector3(x.toDouble(), y.toDouble(), z.toDouble()));
colors.add(getColor(2.5, 0, z.toDouble()));
});
});
offset(x, y) {
return x * RANGE + y;
}
for (var x = 0; x < RANGE - 1; x++) {
for (var y = 0; y < height - 1; y++) {
Vector3 vec0;
Vector3 vec1;
Vector3 n_vec;
// one of two triangle polygons in one rectangle
vec0 = (geometry.vertices[offset(x, y)] - geometry.vertices[offset(x + 1, y)]);
vec1 = (geometry.vertices[offset(x, y)] - geometry.vertices[offset(x, y + 1)]);
n_vec.crossInto(vec0, vec1).normalize();
geometry.faces.add(new Face3(offset(x, y), offset(x + 1, y), offset(x, y + 1), n_vec, [colors[offset(x, y)], colors[offset(x + 1, y)], colors[offset(x, y + 1)]]));
geometry.faces.add(new Face3(offset(x, y), offset(x, y + 1), offset(x + 1, y), n_vec.negate(), [colors[offset(x, y)], colors[offset(x, y + 1)], colors[offset(x + 1, y)]]));
// the other one
vec0 = (geometry.vertices[offset(x + 1, y)] - geometry.vertices[offset(x + 1, y + 1)]);
vec1 = (geometry.vertices[offset(x, y + 1)] - geometry.vertices[offset(x + 1, y + 1)]);
n_vec.crossInto(vec0, vec1).normalize();
geometry.faces.add(new Face3(offset(x + 1, y), offset(x + 1, y + 1), offset(x, y + 1), n_vec, [colors[offset(x + 1, y)], colors[offset(x + 1, y + 1)], colors[offset(x, y + 1)]]));
geometry.faces.add(new Face3(offset(x + 1, y), offset(x, y + 1), offset(x + 1, y + 1), n_vec.negate(), [colors[offset(x + 1, y)], colors[offset(x, y + 1)], colors[offset(x + 1, y + 1)]]));
}
}
var material = new MeshLambertMaterial(vertexColors: VertexColors);
var mesh = new Mesh(geometry, material);
scene.add(mesh);
}
The error seems to be on the occurrence of this line:
n_vec.crossInto(vec0, vec1).normalize();
What is the null object here and how do I solve this? Could the variable 'z' be causing the issue? It first showed null, and caused a similar error (that '*' cannot be applied) and I declared it as double and that got solved. I also have a suspicion in the below lines:
data.forEach((col) {
col.forEach((val) {
geometry.vertices.add(new Vector3(x.toDouble(), y.toDouble(), z.toDouble()));

n_vec is never initialized with an instance of Vector3. crossInto requires to be called on an instance, Either you create an instance first:
Vector3 n_vec = new Vector3.zero();
...
n_vec.crossInto(vec0, vec1).normalize();
Or you use the cross method, but it creates a new instance of Vector3 (you might want to avoid new instances, than I would move the variables out of the loop):
n_vec = vec0.cross(vec1).normalize();

ZedGraph labels

In ZedGraph, how do I show text labels for each point and in the XAxis all together?
If I do
myPane.XAxis.Type = AxisType.Text;
myPane.XAxis.Scale.TextLabels = array_of_string;
I get labels on the XAxis like this
And if I do
for (int i = 0; i < myCurve.Points.Count; i++)
{
PointPair pt = myCurve.Points[i];
// Create a text label from the Y data value
TextObj text = new TextObj(
pt.Y.ToString("f0"), pt.X, pt.Y + 0.1,
CoordType.AxisXYScale, AlignH.Left, AlignV.Center);
text.ZOrder = ZOrder.A_InFront;
text.FontSpec.Angle = 0;
myPane.GraphObjList.Add(text);
}
I get labels on the curve, like this
But if I do both at the same time, labels on the curve disappear.
Is there a way to combine both kind of labels?

I've changed my answer after you clarified the question.
You just have to remember to position the labels correctly:
<%
System.Collections.Generic.List<ZedGraphWebPointPair> points = new System.Collections.Generic.List<ZedGraphWebPointPair>();
for (int i = 0; i < 15; i++)
{
// Let's have some fun with maths
points.Add(new ZedGraphWebPointPair
{
X = i,
Y = Math.Pow(i - 10, 2) * -1 + 120
});
}
System.Collections.Generic.List<string> XAxisLabels = new System.Collections.Generic.List<string>();
TestGraph.CurveList.Add(new ZedGraphWebLineItem { Color = System.Drawing.Color.Red });
TestGraph.XAxis.Scale.FontSpec.Size = 9;
int j = 1;
foreach (ZedGraphWebPointPair point in points)
{
// Add the points we calculated
TestGraph.CurveList[0].Points.Add(point);
// Add the labels for the points
TestGraph.GraphObjList.Add(new ZedGraphWebTextObj
{
Location =
{
CoordinateFrame = ZedGraph.CoordType.XChartFractionYScale,
// Make sure we position them according to the CoordinateFrame
X = Convert.ToSingle(j) / points.Count - 0.05f,
Y = Convert.ToSingle(point.Y) + 3f,
AlignV = ZedGraph.AlignV.Top
},
Text = point.Y.ToString(),
FontSpec = { Angle = 90, Size = 9, Border = { IsVisible = false } }
});
// Add the labels for the XAxis
XAxisLabels.Add(String.Format("P{0}", j));
j++;
}
TestGraph.RenderGraph += delegate(ZedGraphWeb zgw, System.Drawing.Graphics g, ZedGraph.MasterPane mp)
{
ZedGraph.GraphPane gp = mp[0];
gp.XAxis.Type = ZedGraph.AxisType.Text;
gp.XAxis.Scale.TextLabels = XAxisLabels.ToArray();
};
%>
That code will produce this graph:

If the axis type is text, the code below is easier to get x-coordinates of the points ;)
for (int tPoint = 0; tPoint < curve.Points.Count; tPoint++)
{
TextObj text = new TextObj(curve.Points[tPoint].Y.ToString(), curve.Points[tPoint].X, curve.Points[tPoint].Y + 10);
}

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