# Tagged Questions

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

1answer
26 views

### Way to have inutition about the shape of a curve?

Past the usual memorized curves like $y=\sin(x), y=|x|, y=1/x, y=\ln(x), \ldots,$ is there a way to have an intuition about the shape of a curve from looking at an arbitrary function/term? (that is, ...
0answers
16 views

### Ellipse radius interpolation with different radiuses

I am writing a library for graphical LCDs and I want to incorporate a function to draw a circle on the screen. I have already succeeded in drawing simple circles, however, I want to be able to pass a ...
1answer
39 views

### Can the graph of $x^x$ have a real-valued plot below zero?

The function $f(x) = x^x$ gives a complex number only if x has an even denominator. I'm not sure about irrational numbers. Why, then, is the best graph I can find of that function that of Wolfram ...
1answer
31 views

### How can I draw a polygon from a set of angles?

In recreational mathematics, polytans are polygons formed by edge-connecting isosceles right triangles. Order-n polytans are those constructed from n such triangles. My question is this: Given a ...
1answer
19 views

### How to graph an absolute value equation?

How would you graph: $|x+y|=1$ ? I can do the normal $y=|x+1|$ and all that. But how would you do a question with two of these unknowns in the absolute value? Any help would be greatly appreciated, ...
4answers
54 views

### Sketch the function $y = {1 \over {{x^2}}}\ln x$

I don't know where to begin with this, the ${1 \over {{x^2}}}$ part of the function throws me off, how to do I go about this? How does one generally approach a question like this?
2answers
46 views

### Graphing $y= \frac{x^3}{x^2-1}$

I'm having a lot of problems trying to graph this... other than using a graphics calculator! I know the domain is all real values of $x , x$ does not equal $-1 \text{or} 1$. The point of inflection ...
0answers
14 views

### Plotting error in Cygwin-Octave [closed]

Given various step sizes, I want to plot the maximum value of error between an approximation and exact solutions. I already have a program that will produce any approximation I want, I'm just stuck on ...
1answer
38 views

### Translating the apex of $-x^2$

I am attempting to write a function with the following properties: The highest possible value is 100, and the further you get from a certain value, the lower the result the function will return... I ...
0answers
21 views

### plotting functions in 3d

I'm writing a function plotter as my first program in direct3d , plotting functions in 2d is straight forward x->for samples and y->for f(x) , what I want to know is how should I draw 3d ...
0answers
14 views

### How can you find the nature of a graph?

I have a physics project, and I have to develop an argument, but am not allowed to use phrases like "From the graph you can tell..." How can the nature of the graph be determined manually, e.g. ...
1answer
55 views

### Is the graph of $r = \dfrac{3 \pi}{5}$ a diagonal line?

I'm reviewing my notes and I came upon this. It says that $$\begin{align} r \sin \theta &= 5 \tag{horizontal line} \\ r &= \dfrac{3 \pi}{5} \tag{diagonal line} \end{align}$$ How is this ...
2answers
33 views

### Sketching a graph under certain condtions

I got a question like this, sketch the graph of a function that satisfies the following conditions, the domain is [0,oo]; the range is [4,oo]; the curve passes through [0,5]; while I was ...
1answer
29 views

### Define together with the $x$-axis an area.

The curves $y = \sqrt{2x+3}$ and $y = x$ define together with the $x$-axis an area. Determine the exact value of the specific area. How do you solve?
1answer
20 views

### MATLAB Plot vertical line

I have a system of equations, about 3 equations, that I need to plot that are dependent on 2 variables, R and z. But one of the equations is R={constant value}. ...
3answers
73 views

### the x-axis is between 0 and L

I have a function such as $f (x) = 1 + {x \over L}$ and I would like to graph this function, for $x$ between $0$ and $L$.
1answer
29 views

### Logistic Equation: Equilibrium

Given a differential equation, for example, a logistic curve, how do I determine the equilibrium points, graphically? Consider $$x'=ax\left(1-\frac{x}{b}\right)-\frac{x^2}{1+x^2}$$ It is clear that ...
0answers
21 views

### software to determinate inflextion points and corresponding top and bottom [closed]

Hopefully someone can point me in the right direction. My background in mathematics is not very deep. I've received a number of graph files in a QPC format (I can change the format to ...
0answers
56 views

### plot $(x,y)$ coordinates to a sphere

I have a planar mesh of hexagons (or any other shape) that I want to bend into the shape of a half-sphere. For this purpose I want to loop through each vertice in my mesh and find the proper z ...
3answers
61 views

### Plot function: $f(x,y)$

At first: sorry if I describe something wrong, I dont really know english mathematics. I want to draw a linear map. $f:\Bbb R^2 \rightarrow \Bbb R$ $\vec{x} \mapsto |\vec{a}-\vec{x}|$ ...
2answers
21 views

### Is there a way to calculate the scale of the Y axis without values on the Y axis

given the following bar graph (which shows monthly revenue, but no actual values), is there a way to calculate the revenue (actual dollar amount) in 3/2013?
4answers
92 views

### How to find the angle between two straight line equations?

The Problem There are two straight lines with equations as follow y=-2x+10 and y=-3x+6 their point of intersection is (2,6) and i am asked to find the angle between them ? A detailed and easy ...
1answer
40 views

### Normalizing graphs?

I have a statistical line graph for a website which is all automated, but it does not look very nice. What can I do with the data (massage it, etc) to make it look better and easier to read? The graph ...
1answer
25 views

### Visualising a graph from $\mathbb{R^3}$ to $\mathbb{R}$

Given a function, any function, exempli gratia, $$f(x,y,z)=\frac{x^2y}{z}$$ It's range will be whole of $\mathbb{R}$(???). Plotting the graph does not make sense. How can I, if I can, visualise this ...
1answer
17 views

### Plotting a function $\phi: C \to R$ in $R^3$ by writing it in terms of $\phi: R \times R \to R$.

I have a complex polynomial $f(z)$ and I would like to plot a 3D graph that takes in $x$ and $y$ (as the real/imaginary parts) and outputs the modulus of the result. How can I write, for example ...
3answers
72 views

### How to draw graph of this function

Given f(x) is a function where its 2nd derivatives f''(x) as shown in the graph below. ...
2answers
55 views

### How to solve this graph problem in WolframAlpha?

I need to input this problem in WolframAlpha: Write an equation of the line containing the given point and parallel to the given line: $(8,-8)$, $7x+8y=5$. The answer is $7x+8y=-8$ but I'm not ...
1answer
32 views

### Model a function with specific shape

I need a function with a specific shape: Quadratic/gaussian concave shape ($-x^2$ like) Centered in $\frac{1}{2}$ where it reaches the max value 1 On 0 and ...
0answers
39 views

### Sketch the graphs of the following functions and show all asymptotes with a dotted line.

Guys so I was just working on a "practice assignment" and I was having trouble with this question. Sketch the graphs of the following functions and show all asymptotes with a doted line ...
1answer
30 views

### Given the graph of a function $f(x)$, describe $\sqrt{f(x)}$

Can someone please help me with this math equation I have a test tomorrow and need to know how to do this thanks gary.
1answer
25 views

### Need help with this transformations question

This "Send-In Assignment" will be graded by your teacher and will be used as part of your final grade. Your grade is based on completeness, neatness, and the quality of work shown. All answers should ...
2answers
37 views

### Matlab plot3 see-through element

I am plotting the following Stewart platform in Matlab using plot3 and fill3. The green line that I have marked in the red ...
1answer
46 views

### What this graph called and what is its equation?

I am not a mathematician and I last time I used a formula more complex than sin(x) was during my university time about 10 years ago. Recently I saw an interesting graph but I couldn't find its ...
2answers
37 views

### Finding area in a bounded region

How would I solve the following problem? Sketch the region bounded by the graphs of $f(x)=x^2-4x$ and $-3x^2$ and then find the area of the region. I have made a sketch for this question but ...
5answers
93 views

### Formula with 2 points of inflection

$x^3$ has a point of inflection at $x=0$. How will you modify the formula to add a 2nd point of inflection at $x=1$? Plot of $x^3$ Plot of $x^3(x-1)^3$ Update The plot I am aiming to achieve ...
2answers
34 views

### Why does a linear line on a logscale vs. logscale plot imply an exponential relashionship?

I've seen this type of plot many times in the context of exponential relationships (e.g., Bak's sandhill). If I increase the variable on the x-axis tenfold, and I get back a tenfold increase in y, ...
0answers
127 views

### Equation of a 3d cone

Find explicit, implicit and parametric representation of a 3d cone with the following attributes: Its tip is located at the origin It opens in the positive direrction of the $Z$ axis The opening ...
0answers
51 views

### Triangle mapped on a sphere in $\mathbb R^3$? [closed]

How can I map a triangle on an sphere? I want to visualize (plot or animate) it for my student in my Non Euclidean geometry. I have no restrictions on the triangle's kind or on the sphere in \$\mathbb ...
0answers
38 views

### Plotting characteristic equations maple

I'm trying to plot the characteristics for the following PDE with initial conditions: $$u_t +uu_x =0$$ where $$u(x,0)=a \ for\ x<-1, \ b\ for\ -1<x<1, \ c \ for\ x>1.$$ I'm first ...
1answer
31 views

### How can I calculate the bode magnitude and frequency as well as their plots?

I've been trying to figure this problem out for a while now. I've been given a transfer function $$H(s) = \frac{s(s+100)}{(s+2)(s+20)}.$$ I'm supposed to calculate the bode magnitude and frequency for ...
2answers
30 views

### Radioactive decay

When we plot the amount of radioactive nuclei at certain time intervals, we get a plot like this: First of all, what kind of function is this? To me it looks like $y=(e^x)^{-1}$ or \$y=(\log ...
1answer
89 views

### Fourier series of a function

Consider $$f(t)= \begin{cases} 1 \mbox{ ; } 0<t<1\\ 2-t \mbox{ ; } 1<t<2 \end{cases}$$ Let $f_1(t)$ be the Fourier sine series and $f_2(t)$ be the Fourier cosine series of $f$, ...
2answers
67 views

### Plotting joint distribution of 2-D random variable

I have some data which is basically a list of order pair (X,Y) and I want to see the joint distribution of this 2-D random variable. Is there any tool that provide this facility. Does Matlab has this ...
1answer
20 views

### Clues to find the graphs of functions

How do I find the graph for functions $f_n(x)=x^n$ where $n\in \mathbb{N} \bigcup \{0 \}$? Thanks for all the help!
1answer
31 views

### What kind of graphs are these and how can I create equations that model them?

Think of a line graph where the line stays somewhat flat and low to the ground for a while (but still upsloping, nondecreasing) and then starts to arc up. I'm trying to figure out a way to ...
0answers
27 views

### Topology for a metric $R^2$ + graph using mathlab

For selfstudy I am taking a topology course and learning about metric spaces, the teacher talk about topology for a metric, this is: $B_{1}((0,0))$ for $p=1,2,..$ in $R_p^{1}$ and $R_p^{2}$, where ...
4answers
64 views

### Sketching the graph of a trig function

How would I sketch the following function. $f(x)=\cos(x)+\sin(x)$ on $[0,2\pi]$ for my first derivative I got $f'(x)=-\sin(x)+\cos(x)=0$ but How would I find the critical points I mean I know ...
1answer
60 views

### Burger's Equation 'Shocks' Not matching the characteristics

Album to view all the images that are described below. I have am using Burger's Equation with the initial condition of a Gaussian. The blue curve is the initial function before any time has passed, ...
2answers
40 views

### Limit aproaching infinity $f(x) = -\infty$ ?!?

On one of my homework problems it's asking for me to sketch a graph of a function which fulfills five requirements. All of the requirements make sense to me other than the following: ...
0answers
21 views

### random graph's #edges based on probability

If probability of occurrence of edges is 1/2, then will there be n c 2 * (1/2) total edges. Does this applies irrespective of where edges do occur.
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