Questions about the use of built-in Mathematica functions, including pure functions.
0
votes
0answers
42 views
creating some smooth density functions
I would like to create some density functions based on some distance measure $D$. As a base density function lets say I have a Gaussian density $f$ with mean $-1$ and variance $1$. I would like to ...
5
votes
1answer
96 views
Iteration process involving several functions
I would like to carry out a following iteration process:
Apply function f1[a_,b_,c_,d_] to a starting list l1={a1,b1,c1,d1}, ...
4
votes
1answer
77 views
Why DateDifference returns machine number?
Is there any specific reason why DateDifference cannot give an exact number in this case?
...
2
votes
1answer
61 views
Function to differentiate between date pattern and specific string format
I'd like to write a function that behaves one way when the argument is a Mathematica date, such as {2013,12,15}, or with added hours, minutes and seconds if ...
0
votes
2answers
63 views
I want to define a function that has integer power [on hold]
I am defining this function: f[x_] = kr*g[x] + (c^l*x^l)/(KIR + c^l*x^l)
But I want to make l bigger than 0, so if I evaluate ...
3
votes
2answers
95 views
Selecting for 2D points that are within a threshold distance of an upper- and lower-bound number of points
I have a very large set of 2D points:
numberOf2DPoints = 10^6;
pointList = RandomReal[{0, 1000}, {numberOf2DPoints, 2}];
I'd like to find a way to quickly ...
1
vote
1answer
64 views
Passing a joined list of symbols for Module or Block to treat as its own local symbols
The Question
I'd like to write a function which itself takes a list of symbols, e.g.
Foo[{x, y, z}]
to pass to Module ...
2
votes
1answer
93 views
How to express an expression with only ArcTan and ArcTanh?
I have an expression which is simply
(j/k) x^(j/k) LerchPhi[x,1,j/k)]
where 0 < j < k.
Manually I have been able ...
0
votes
1answer
76 views
Is there any automatic method for rating function arguments importance?
If I have a function:
y = 2a + 5b + c
It can be easily seen that b is the most important parameter, next ...
0
votes
1answer
23 views
Stop function evaluating input at time of definition [duplicate]
I would like to create a function that acts on whether the input is even or odd, e.g.:
In[644]:= f[a_] = If[EvenQ[a], 2 a, 3 a];
f[2]
Out[645]= 6
I've ...
2
votes
2answers
71 views
Generation function of recurrence sequence
I'm trying to find generation function of recurrence sequence
...
4
votes
0answers
69 views
Strange behaviour of Internal`InheritedBlock
I was going to post an answer for fast way to replace all zeros in the matrix. I was even quite happy because timings were the same order of magnitude as others.
The idea was to overwrite ...
4
votes
2answers
127 views
Random Matrix with integer coefficients and inverse also having integer coefficients
I'm trying to build a function that gives me matrices such that each:
Has integer coefficients.
Is non singular.
Has inverse which also has integer coefficients.
I have some code that one of my ...
-3
votes
1answer
72 views
Gamma Incomplete Function representation in Mathematica and Matlab
I am confused about Gamma Incomplete function calculation in Mathematica and MatLab:
For example, in Mathematica:
Gamma[5,3] = 19.56
But in MatLab:
...
3
votes
2answers
111 views
ArcTan[z] and ArcTan[x,y], Restriction and Conversion
In Mathematica there are two different forms for the arctangent (inverse tangent), namely
ArcTan[x,y]
which gives the arc ...
