All Questions
83 questions
1
vote
0
answers
104
views
How to use the tedious definitional results to make a next definition for FindRoot?
I am trying to use a designed function to find the quasi-normal modes.
...
- 61
6
votes
3
answers
263
views
Composition of vectorvalued functions
Suppose I have two functions $f,g:\mathbb{R}^2 \to \mathbb{R}^2$ and that I want to compute $g(f(x,y))$. As an example, let's take $f(x,y)=(x+y, x-y)$ and $g(x,y)=(y^2,x^2)$. Then, $g(f(1,2))=(1,9)$.
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- 175
0
votes
0
answers
50
views
How do we create a function for the recurrence relation in terms of a dependent variable?
Suppose
S = {{-1.5, 1}, {0, 1}, {1.5, 1}, {1.5, 0.1}, {0, -0.1}, {-1.5, 0}, {1, -1.4}, {-1, -1.5}}
How do we define the recurrence relation as a function of the ...
- 151
1
vote
1
answer
102
views
11
votes
2
answers
1k
views
What is a function?
Regarding:
Map[#[{2, b}] &, {Reverse}]
The above works, but it makes my head spin. The documentation for Map says that the ...
- 467
1
vote
2
answers
127
views
Generate n tables of values for functions
After searching for a long time, I can't find how to do what I need with some bold header style.
I need to generate n tables of values for linear functions (f(x)=mx+n), where x varies from -6 to 6, ...
- 309
1
vote
1
answer
98
views
generate quadratic functions to evaluate membership of points
How can I make a printable list with different quadratic functions and with points that belong or not to them so that a young person can check whether or not the point belongs to the parabola? my code ...
- 2,365
0
votes
2
answers
277
views
How to create an operator which is a composition of a sequence of operators?
Suppose I have a sequence of operators $\partial_x$, $\partial_x^2$,..., $\partial_x^n$. I want to define an operator which is a composition of these $D_x^{(n)}=\partial_x\circ\partial_x^2\circ\cdot\...
0
votes
1
answer
55
views
Resizing the graph of a function with radicals , Why?
I am trying to graph this function
$c(t)=\frac{2-\sqrt{t+3}}{1-t}$
using this code, to see its behavior at infinity.
I need that in the vertical axis appears the value when $t->1$ (The graphs ...
- 83
0
votes
2
answers
136
views
Redefining the output of a function
ftn1 = Sin[s]^2 + 3 t^2 + u^5
3 t^2 + u^5 + sin[s]^2
ftn2[s_, t_, u_] := ftn1
ftn2[2, 1, 2]
3 t^2 + u^5 + Sin[s]^2
Hi ...
- 631
0
votes
3
answers
120
views
Composition of Maps
I want to create a composition of several lists. For example:
...
0
votes
0
answers
262
views
How to define function in Mathematica
I have a 3 by 3 symbolic matrix M(x,y,z).
Question:1
First, I want to find its eigenvalues and eigenvectors. After that I want to make each eigenvalue and eigenvector a function of x,y, and z i.e.
<...
- 173
1
vote
1
answer
65
views
How to emulate statistical command choice tab of this widget?-how to do what i ask?
I designed this little program, but I want you to be able to choose what I want to look for by choosing it as you do with the widget tab, please help me.
widget
Widget of internet
my program
...
- 500
0
votes
1
answer
47
views
Is there a better syntax to obtain the derivative of a function as a function/operator? (e.g. for simple plotting of derivtives of functions, etc.)
When trying to plot a derivative of a function, (I take Sin as a simple example), the naive approach
...
- 693
4
votes
3
answers
232
views
How to implement an integration filter on arrays?
I have the discrete integration filters:
$$y(n) = Ax(n) + By(n−p) , \text{$A$, $B$ real constants, $p$ positive integer}$$
EDIT: in the initial version of this question I focussed only on the case $...
- 1,559