Tagged Questions
6
votes
1answer
249 views
0
votes
0answers
81 views
A problem with functions and Infinite expression 1/0 encountering
Following code (function) makes integrals and then replace f[x] with Cos functions and calculate the definite parametric ...
0
votes
1answer
104 views
A problem with set values
The following code is just an example to clearly explain my problem.
Assume that :
...
2
votes
0answers
52 views
Can BreadthFirstScan be modified?
I would like to obtain a "slick" implementation of A*-search algorithm on Graph objects, using the built-in BreadthFirstScan (if that is possible at all). I noticed that BreadthFirstScan is static in ...
1
vote
3answers
171 views
How to update a list in a function in each iteration
There is a list with numbers 1 to 8 ( p1 ) and another list (j) which contains 4 numbers which shows different 4 positions of ...
-1
votes
1answer
87 views
Transformation of a simple logic statement
I'm designing a logic circuit and I was wondering if the following two things are equivalent:
(x <= y) and (x < (y + 1))
I can't think of any set of numbers that would make these two things ...
0
votes
1answer
46 views
How to put some values from a list into a function in a Do loop
I want to program a code in MATHEMATICA in order to calculate some values in different iteration. For example, assume this list:
list={1,2,3,4,5}
Now assume that ...
1
vote
2answers
73 views
Avoid making repeated Random Integer in different iterations
Assume following code :
Do[
i1 = RandomInteger[{1, 5}];
i2 = RandomInteger[{1, 5}];
While[i1 == i2, i2 = RandomInteger[{1, 5}]]
, {k, 1, 4}];`
This ...
0
votes
1answer
71 views
How to write series of Do[ ]'s with a single Table[ ]?
Edited to provide more information (sorry I don't know how to format matrices here)
I would like to replace:
m = 4;
...
2
votes
1answer
101 views
Piecewise function with user-input interval
I would like define a function g[data,bins,x] which is a piecewise constant function taking value data[[i]] in the range ...
8
votes
3answers
175 views
0
votes
1answer
214 views
How to combine two usages of # into one and speed up the code?
I have a function num with two variables, matf and matg. How can I combine the last two lines of code below into one? The code is aimed to find out the maxiaml count bel when we give each $i3 = ...
4
votes
4answers
315 views
How to find the maximum of a function on a set of discrete points?
How to find the maximum of a function on a set of discrete points? For example, what is the best way to find the maximum of
...
17
votes
1answer
177 views
How to get Cases to wrap results in an arbitrary head?
A number of functions provide for results to be wrapped in an arbitrary head. This is very important in cases where the results should not be evaluated. Take ...
10
votes
5answers
472 views
How to find first list element that differs from average of N previous elements by more than a given amount?
Given a list of real numbers, I need to write a function that returns the value of the first element in the list that differs from the mean of the previous $N$ elements by greater than $P$ standard ...
2
votes
1answer
230 views
Call Functions From File Without Modifying Context (Sandbox)
Let's say I have file named test.m containing
test[arg1_] := ( Print[arg1];)
What is the best technique for calling test like ...
17
votes
4answers
506 views
Accessing list elements by name
First, a bit of a long introduction to my problem:
I only have a few weeks of Mathematica experience. I am creating a mathematica application that calculates some material properties of steel based ...
11
votes
4answers
1k views
How to modify function argument?
Usually in programming languages, function arguments are normal local variables, which can be modified.
Is this not true in Mathematica?
...
11
votes
4answers
766 views
Pure Functions with Lists as arguments
Assuming I have two function:
example 1:
add[{x_, y_, z_}] := x + y - z
add[{1, 3, 5}]
If use pure function,I know I can write it as :
...
0
votes
2answers
117 views
How to obtain a smaller-sized output from Solve
I am solving a system of 15 simultaneous linear equations using Solve. On running the code, I get a message saying "A very large output was generated" with options ...
0
votes
1answer
1k views
Loops and subroutines [duplicate]
Possible Duplicate:
Alternatives to procedural loops and iterating over lists in Mathematica
I am new to Mathematica and not familiar with functional programming. In particular, I have no ...
1
vote
1answer
205 views
Problem with function as an argument
I want to write a function like the following:
s[u_, v_, x_, val_] := u[val]/NIntegrate[u'[x] v[x] + u'[x] v'[x], {x, 0, 1}]
So I can evaluate something like
...
2
votes
1answer
317 views
Cournot Equilibrium
I'm trying to determine reaction functions of a Cournot equilibrium for $n$ firms using the same optimal condition, using the fixed point method.
This is the method I'm using:
...
2
votes
5answers
376 views
How to leave function unevaluated programmatically?
Is it possible to write a function in such manner, that it can be either evaluated or left unevaluated?
This is a general question. Sample below is just a sample. No need to find solution for this ...
4
votes
3answers
350 views
4
votes
2answers
241 views
How can I use Max[] in a function that is passed a list not find the max of the list
For most functions in Mathematica, passing them a list will call the function on each element of the list. For example:
...
4
votes
1answer
243 views
How to organize and run functions?
I am very new to Mathematica. I thought I would try it out for my first assignment in my computer science class. Until now I have only used C-base languages including C#, Java, Objective-C, and ...
8
votes
2answers
1k views
Pass function or formula as function parameter
I can write either
Integrate[x^2, {x,0,3}]
or
f[x_] = x^2
Integrate[f[x],{x,0,3}]
and get the same computation. Suppose I ...
8
votes
1answer
702 views
(Non-Convex) Polygon Union and Intersection Functions [duplicate]
Possible Duplicate:
Intersecting graphics
Back in 2009 I posted a question in comp.soft-sys.math.mathematica looking for a function which generates the union of two (not necessarily convex) ...
2
votes
3answers
161 views
Using Nest inside NestList
I need results like this:
{Cos[Cos[x]], Sin[Cos[Cos[x]]],Cos[Cos[Sin[Cos[Cos[x]]]]],
Sin[Cos[Cos[Sin[Cos[Cos[x]]]]]], ... }
I've tried to use ...
13
votes
3answers
273 views
How to keep some of the results of the NestList
I'm using some iterative arithmetics to calculate wave propagation with the help of NestList. I have to use a small step size for iteration to guarantee the accuracy, which lead to too much data (e.g, ...
9
votes
1answer
445 views
GeoDirection and GeoDistance Memory Leaks: How to Recover the Memory?
The functions GeoDirection and GeoDistance have memory leaks. To see this, run the example functions below and watch as the Physical Memory Available in the Windows Task Manager, Performance tab, ...
7
votes
2answers
262 views
What's the purpose of the Unique function?
As the title says: What's the purpose of Unique?
I understand that it generates some unique symbol, but when and for what is it to be used? Are there applications ...
50
votes
2answers
2k views
Flatten command: matrix as second argument
One thing I could never wrap my head around is how Flatten works when provided with a matrix as the second argument, and the Mathematica help isn't particularly ...
