XCalc | A Javascript computer algebra system that graphs | Data Visualization library
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A Javascript computer algebra system that graphs and differentiates
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QUESTION
I am referring to this link.
...ANSWER
Answered 2021-Mar-08 at 00:58The name is mapped to an index in the vtable at compile time, so at run time the function call is just an array lookup.
The code in question results in Undefined Behavior, because a b2 is not a Greeter*. (A dynamic_cast would return nullptr.) One possible outcome is that the vtable entry for sayHi will have the same index as the exec function in Execute, so while the source code looks like it will call sayHi, it will actually call exec. Or it could crash.
But anything can happen.
QUESTION
I'm attempting to implement the A* pathfinding algorithm for a 2d hexagonal tilemap. I've got the following HexCell class that acts as a data container and adjacency finder using a hex index integer:
...ANSWER
Answered 2020-Feb-22 at 22:36Found the solution to my problem. The adjacency logic within each hex was not quite right as I suspected. Finding correct adjacent indices requires an offset on every other row due to the layout of the hexagonal grid.
QUESTION
When I draw multiple circles onto my canvas, they sort of come together to form a weird shape. I have 25 "x" and "y" values to draw the circles stored in an array. I am not sure if this is because the "x" and "y" values of 2 or more circles are the same. Is there any way I can prevent this and/or make sure the x and y values of the circles are minimum 10 away from any other values? Thanks.
Edit: I have found a solution to this thanks to Nick Parsons. I am still wondering if I can check if two or more "x" or "y" values are x (x symbolizes a number) amount close to each other, so for example: if 2 different "x" values have a difference less than 10, log "too close" in the console.
My JavaScript: (I have tried to add helpful comments)
...ANSWER
Answered 2019-Nov-06 at 08:37You need to begin your path each time you create a new circle, so you can move ctx.beginPath() into your for loop like so:
QUESTION
package main
import (
"fmt"
"math"
)
func main() {
distencecalc()
}
func distencecalc() {
fmt.Println("X1 :")
var x1 float64
fmt.Scanf("%f", &x1)
fmt.Print("")
fmt.Println("Y1 :")
var y1 float64
fmt.Scanf("%f", &y1)
fmt.Print("")
fmt.Println("Z1 :")
var z1 float64
fmt.Scanf("%f", &z1)
fmt.Print("")
fmt.Println("X2 :")
var x2 float64
fmt.Scanf("%f", &x2)
fmt.Print("")
fmt.Println("Y2 :")
var y2 float64
fmt.Scanf("%f", &y2)
fmt.Print("")
fmt.Println("Z2 :")
var z2 float64
fmt.Scanf("%f", &z2)
fmt.Print("")
var Xcalc = x2 - x1
var Ycalc = y2 - y1
var Zcalc = z2 - z1
var calcX = math.Pow(Xcalc, 2)
var calcY = math.Pow(Ycalc, 2)
var calcZ = math.Pow(Zcalc, 2)
var allcalc = calcX + calcZ + calcY
fmt.Println("the result is :")
fmt.Println(math.Sqrt(allcalc))
}
ANSWER
Answered 2019-Feb-19 at 10:01Actually the code in question works on unix systems, but usually the problem is that calls like fmt.Scanf("%f", &x1) does not consume newlines, but quoting from package doc of fmt: Scanning:
Scan, Fscan, Sscan treat newlines in the input as spaces.
And on Windows the newline is not a single \n character but \r\n, so the subsequent fmt.Scanf() call will proceed immediately without waiting for further input from the user.
So you have to add a newline to your format string to avoid subsequent fmt.Scanf() call to proceed:
QUESTION
I've been given an assignment for my class to make a program that draws Mandelbrot figures.
We have to basically get the program to draw a bitmap of the result.
Thing is, my CalcMBF function only outputs 2 as the Mandelbrot number.
I have absolutely no idea why that is. Can anyone help me out?
Here is my code:
...ANSWER
Answered 2018-Dec-04 at 00:19It computes beautifully. Only you made a mess of instance variables and arguments.
In CalcMBF, it should be:
QUESTION
Summary: How do I plot figures, over SSH, to a remote computer when the local computer is running OS X?
I have computer A and I am trying to use matplotlib to plot on computer B. The problem I am having is that when I use matplotlib the plots only display on Computer A. I VNC in and watch them pop up. I can ssh -X/-Y into Computer A and run xcalc and it will display on computer B. I can connect Computer B to a third computer, running Red Hat, and plots will display on Computer B. I am convinced it is not Computer B that is the problem. I believe my problem is the same as this problem: none of the package installers support X11 backends for matplotlib. I cannot comment so I'm stuck putting what I've tried in a new question. This is another description of the same problem with multiple solution attempts that do not work.
As mentioned, I have tried a lot of solutions in terms of installing backends for matplotlib on Computer A. I've tried all manor of macports and homebrew and pip combinations. I'm pretty sure it is a bad idea to mix so many package handlers, but so many solutions seem to be "sudo ***** install package-name".
To test whether matplotlib is doing what I want I use the following python snippet:
...ANSWER
Answered 2018-Feb-24 at 18:43This ended up leading me to the right answer. The problem was I couldn't get a backend installed that used X11. It turns out macports has a tk version that uses x11. I think this is actually the default setting when installing python using macports.
The steps I took to get matplotlib plotting over ssh/X11 from an OS X server (Computer A) were:
1) Uninstall the previous macports install of matplotlib and tk:
QUESTION
I'm new at Python programming and have little to no experience in object oriented programming in general. I came across a problem which I cannot really understand. I know where the problem is, but I don't know why it is there. Since I want to understand the basics of object oriented programming, switching to existing libraries is not an option for me.
So here is what I want to do: I have several *.csv files that simply contain 2D coordinates (x and y). I read the files line by line and from each pair of x and y I create an object "Point2D". Then I add this "Point2D" to a list that is stored in another object "PointCloud".
Now comes the odd part: The function "getPointCloudFromCam2Meas" works fine if I only open one single *.csv file. If I open up two files one after another, the second call of the function returns the first point cloud + the second point cloud (appended), even though the local variable "ptc" is initialized as a new "PointCloud" each call.
Why does the program behave like that?
...ANSWER
Answered 2017-Aug-14 at 09:26in class PointCloud:
You declare points as a class variable:
QUESTION
I have taken this Fortran program from a book which basically runs a goodness to fit test for certain data and gives output. Code and its actual result/output are given as under:
...ANSWER
Answered 2017-May-07 at 20:40The code is a written using the (old) Fortran 77 style with the addition of some common extensions. Since it uses the so called fixed-form the columns used by the source code are crucial to have a correct code. In particular for the case:
- comments are defined by c character at the first column
- continuation lines are defined by * at the sixth column
- labels must use the first 5 columns
- regular code must use 7-72 column range
Properly indenting your code allows to have it running on both GNU gfortran (tested using v.4.8.2) and Intel ifort (tested using version 15.0.2). To inform the compiler that you want to adopt the fixed-form for most compilers you have just to use .f extension for the source file. Otherwise you have suitable compilers options. For gfortran, compile specifying -ffixed-form. to The (minimally) indented code is provided below.
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