Questions regarding the plotting or graphing of functions. Questions about graphs with vertices and edges should use the (graph-theory) tag instead. (STUB)

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4
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1answer
47 views

Speediness and correctness when graphing by hand .

First of all thank you for visiting this question! I believe it's a pretty simple problem but get's kinda hairy and time consuming on each step as I have done it, so my question (the one you are here ...
0
votes
4answers
80 views

Multiple choice question on rates of change (or so I thought)

If I were to find the resistance of the component (see image below), I would either find the equation of the curve and use differentiation or I'd draw a tangent at $V_2$ and then find the reciprocal ...
0
votes
1answer
17 views

Ordering angles using max and min functions

I'm using the awesome Desmos Graphing calculator to graph cyclic quadrilaterals. The idea is that the user can drag a slider to change the value of the angle of each point A, B, C and D. I have done ...
0
votes
1answer
30 views

What determines the rotation direction in a $2$ D Dynamical system?

Say we have a non linear system $\dot{x}=f(x)$ and we linearise this around an equilibrium point $x_0$, to obtain the linear sytem: $\dot{x}=Df(x_0)\cdot x$. Where $Df(x_0)$ is the jacobian (and in ...
0
votes
1answer
33 views

Can an equation represent a curve in 3D space?

I tried to get a equation that can represent a spiral like spring: $$z=\frac{height}{2\pi }\cdot \arctan \left ( \sqrt{\frac{radius^{2}-x^{2}}{radius^{2}-y^{2}}} \right )$$ I am not sure about the ...
1
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0answers
30 views

Plot histogram and density function

I need to plot a histogram for the data: ...
1
vote
1answer
28 views

Find Sin Function from points?

I have these points and I need to find the sine function can anyone please show me how to do this step by step? Or just give me pointers on where to start and what the equation actually is? (0,2.8) ...
0
votes
1answer
37 views

what type of function does this curve best represent? [closed]

What type of function does this best represent and also if anyone can help me find that function it would be much appreciated! ! (http://i.gyazo.com/932b96ebf695f259a4301244952aabf3.png) !
0
votes
1answer
34 views

Periodic expansion of function

Let $ \tilde{f}: \mathbb{R} \rightarrow \mathbb{R} $ be the 2-periodic expansion of the function $ f: [-1,1[ \rightarrow \mathbb{R} $ given by $ f(x)=x $. But how can I make a graph of $ \tilde{f} $ ...
1
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0answers
39 views

What is the number of x-intercepts in this graph of sine?

The function : $y=3-4\sin(2\pi x-3\pi)$ .. how many $x$-intercepts over the interval $[0,2]$? I am confused if they're 3 or 5 because there are 3 $x$-intercepts that are really intercepting ...
0
votes
3answers
150 views

Sketching graphs of circles.

A circle graph function is in the form of $x^2 + y^2 = r^2$ If I am asked to graph $(x-2)^2 + (y - 1)^2 = 4$, do I have to solve for x and y to graph first?
0
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3answers
69 views

Graph this function: F(x)=$-2^{|x|+1}$.

Graph this function: F(x)=$-2^{|x|+1}$. when I graph this function and go to check by a graphing calculator I find that I am wrong ! even though I do the horizontal translation So, what's wrong? ...
0
votes
1answer
29 views

How do you visualize the graph of $(x - y)^2 = 4$ without a device?

I can expand it to $x^2 - 2xy + y^2 = 4$, but that doesn't really help, and I cannot isolate the $y$ or $x$ term by itself because of the squared, so I would guess this to be some kind of parabolic ...
0
votes
1answer
41 views

What's a fast way to sketch $y=\sin (5x) + \frac{3}{10}x \sin (5x)$?

What's a fast way to sketch $y= \sin (5x) + \frac{3}{10}x \sin (5x)$ ? I had this question as part of a recent test paper and I had to sketch it for the range $0 \leq x \leq \pi$ . It was for only 2 ...
0
votes
2answers
25 views

Region closer to one given point than to any other given point

(Q) *Consider 6 points located at P0=(0,0), P1=(0,4), P2=(4,0), P3=(-2,-2), P4=(3,3), P5=(5,5). Let R be the region consisting of all points in the plane whose distance from P0 is smaller than that ...
0
votes
1answer
48 views

Function graphs comparison

I'm asking a graph question that has bothered me a while. I'm considering two graphs here: $$ y=(x+2)^2 $$ $$ y=x^2 + 4 $$ As can be seen, both the difference is a mere $4x$. I would like to know if ...
0
votes
1answer
16 views

How to find last pt of triangle

How to find last pt of triangle. I got (1,7) and (0.5, 4). The equations are y = 3|2x − 1| + 4 and y = −|x − 4| + 10
-1
votes
1answer
41 views

What does “symmetric about the origin” mean?

What does it mean when a graph or a point on the Cartesian plane is symmetric about the origin or with respect to the origin?
0
votes
1answer
25 views

Dissection of strange graph

I want to know why the graph in Strange graph problem looks how it does. Can someone explain? Here's the inequality: $(|x|−1)^2+(|y|−1)^2<2$ You can graph this equation at ...
1
vote
1answer
67 views

Describe the graph of f if the graph of its integral its given

Describe the graph of $f$ if the graph of its integral $g(t) = \int_{0}^{t} f(s) ds $ is: graphic of g graphic of f I analyze the derivative and the sign of the derivative and try to find ...
1
vote
1answer
27 views

How do you graph a fractal on a line, as a function of time and position?

I'm writing ANSI C code for work and just got working my LED Light Show Library. The first project it's going on is a sound bar with 10 volume indicator (1-color (white)) leds that are lined-up. ...
0
votes
1answer
24 views

Sketch the graph

Study the derivatives of the function $y={(x^3-4x)^{1\over2}}$ and sketch its graph on the real line. My approach: 1. range of $x$ is $(-2,0)\bigcup (2,\infty)$ 2 . Slope of $f(x)\to\infty$ as ...
0
votes
2answers
29 views

$y = xe^{−1/|x|}$ for $−∞ < x < ∞$

(a) Let $f(x) = x − xe^{−1/x}, x > 0$. Show that f(x) is an increasing function on $(0,∞),$ and $\lim_{x→∞} f(x) = 1$. (b) Using part (a) and calculus, sketch the graphs of $y = x−1, y = x, y = x ...
0
votes
2answers
28 views

Find the graph of the derivative

The graph of a function $f$ defined on $(0,2)$ with the property $\lim_{x\to 0^+}f(x)=\lim_{x\to 2^-}f(x)=\infty$ is as follows:
1
vote
1answer
24 views

Plot a fourier series

I'm not a mathematician but I hope my question is easily answered. I'm trying to learn about graphing equations in a computer application (I'm a programmer). From this link a fourier series is ...
2
votes
1answer
25 views

Predict the nature of the curve

$$f(x)=\int_0^{\sqrt{x}}e^{u^2\over x}du$$ Hence predict the graph of $f(x)$:
2
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0answers
50 views

$x^{y}=y^{x}$ Intersection Question

I'm looking at this problem, $x^{y}=y^{x}$ and the question is to find the point of intersection of the two curves that form a solution set. I understand how to find the point of intersection using a ...
1
vote
0answers
14 views

Shape of graph and plot

Suppose $x \in [0, \infty)$ and $y \in [-1,1]$. When we plot $y$ vs. $x$, we get an upward parabola shape. Suppose we plot $y^2$ vs. $x$. Would the shape also be approximately an upward parabola?
5
votes
5answers
123 views

Points on $(x^2 + y^2)^2 = 2x^2 - 2y^2$ with slope of $1$

Let the curve in the plane defined by the equation: $(x^2 + y^2)^2 = 2x^2 - 2y^2$ How can i graph the curve in the plane and determine the points of the curve where $\frac{dy}{dx} = 1$. My work: ...
2
votes
4answers
98 views

Understanding the graph for $x^y = y^x$

I graphed $x^y=y^x$ and it is a union of the line y=x, with some other curve. So my first question is, how do I derive that other curve? My next question is, why don't I get the same graph when I ...
0
votes
1answer
25 views

Mathematics to compare points

I am not sure if this a question for the mathematics stackoverflow or some other. If it is then please move it. Basically, I have a programming challenge where given list of points (which form a line ...
0
votes
1answer
57 views

Sketching the spectrum of a signal

The figure below shows Fourier spectrum of a signal $g(t)$ Sketch the spectrum of the signal $2g(t)\cos^2(100\pi t)$. Show value in sketch.
2
votes
2answers
64 views

Strange graph problem

I'm trying to figure out this question: in the Cartesian coordinate system, how many grid points (x,y) satisfy $(|x|-1)^2 + (|y|-1)^2 < 2$? When I plugged it in to a graphing calculator, it didn't ...
0
votes
3answers
31 views

Graphing a Circle that doesn't have two of each variable

Graph the circle: $$x^2+y^2-2x-15=0$$ I know how to approach this problem if there were two $y$ and $x$ variables. But there is only one $y$ variable. How would I approach this?
0
votes
1answer
110 views

How do you minimize “hinge-loss”?

A lot of material on the web regarding Loss functions talk about "minimizing the Hinge Loss". However, nobody actually explains it, or at least gives some example. The best material I found is here ...
1
vote
0answers
39 views

How to find change points in a graph on matlab

I have a graph like this I need to find points at which sudden changes happening for the DPC Time Curve. We can observe that at time 20 and around 70 increase is happening. How to do this in Matlab. ...
0
votes
1answer
25 views

Curve Sketching - transforming f(x) to f(a-x)

In class I learnt that to sketch $y=f(a-x)$ given a graph of $y=f(x)$, you reflect the given graph about the line $x=a/2$ (this was proven to us). And then the teacher said that something we ...
1
vote
1answer
66 views

Is there closed form for $(1-p)(1-p^2)(1-p^3)…$ or its Taylor expansion?

I was considering the following problem: Somebody uses a backup for something (e.g. backups a file) and the backup is equally reliable as original storage. The storage is not perfectly reliable and ...
0
votes
0answers
6 views

Steps in Anlaysing Surface Plot

I have two vectors ${\bf x}$, ${\bf y}$ such that $0 \leq x_i, y_j \leq 1$ and a third vector ${\bf z}$ where $z_i \in \{0,1\}$. Each row of the vectors represents an 'observation' and I am trying to ...
0
votes
3answers
65 views

Find the locus of points

Find the locus of points, the distance between them and the point $(2,1)$ is equal to the distance between them and the straight line $4x = 3y$ I know that it is the definition of a parabola But I ...
0
votes
2answers
60 views

What is graph of graph of $y = (x-1)\sqrt{x}$

The book "A student's Guide to Fourier Transforms" 3rd edition, by J.F.James, published by C.U.P., on pages 20 and 21 quotes the equation $y = (x-1)\sqrt{x}$ as an example of one that does not meet ...
0
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0answers
35 views

How do I convert a function $f(x)$ to $f(\frac{x}{a})$?

I have a pretty simple problem but I kinda am confused. I have the function $$f(x)_a = \sqrt{\frac{2}{\pi}} \cdot \frac{Aa}{x^2 + a^2}$$ And especially: $$f(x=0)_a = \sqrt{\frac{2}{\pi}}\cdot ...
0
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2answers
44 views

creating graphs in wolfram alpha

I am trying to plot the function $$\max(x-40,0)$$ in Wolfram|Alpha, but I can't figure out how. What Wolfram|Alpha query URL should I use to produce this graph? Or, what similar online program could ...
2
votes
1answer
26 views

Sine Graphs Equation Meaning

What do each of these numbers mean in this equation for sine graphs? y = -3sin[2(x-30)] + 1 I know 1 = shift up What does the rest mean? thanks.
0
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0answers
19 views

Interpreting functions of graphs

The question asked which of the following is false. I narrowed it down to two, and the correct answer is E with it doesn't cross the x-axis at all. D. f(x) * g(x) intersect the x-axis three times E. ...
0
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1answer
28 views

Drawing a graph of $x\cos\left(\frac 1x\right)$

I have been given a question which asks to draw the graph of $x\cos\left(\frac 1x\right)$ without a calculator. However, I'm unsure as to how to do this. It may involve differentiation as that was the ...
0
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2answers
16 views

Scale 'priority' where 1 is larger than 3 for graph

I simply want change a scale on graph so that 1 is largest value and three is smallest. I have data in excel. A function would preferred as I do not want to simply swap the values.
2
votes
2answers
46 views

Problem with powers

I hope this has not been asked already. while reading a material on upper bounds of polynomials (time complexity) they compared growth of various polynomial functions (like $N\log N$, $N^2$, $N^3$, ...
1
vote
1answer
32 views

description of the function whose graph corresponds to Figure

Consider f be a real continuous function , $f(0) = 0$ , and whose graph has the form shown in the figure: a) How can a give description of the function whose graph corresponds to Figure. b) Sketch ...
1
vote
1answer
30 views

Graphing $f(x)=\log7(x-7)-4$ [closed]

Could someone help me get started on this problem? Graph function $f(x)=\log7(x-7)-4$. Show at least two points and dash in any asymptotes. I'm not quite understanding how to find points with ...