Questions about the use of built-in Mathematica functions, including pure functions.
0
votes
1answer
143 views
Evaluate multivariable function [closed]
I'm trying to use Mathematica to evaluate many values of $f(x,y) $, like $f(-\pi,\pi) $ for
$$f(x,y) = \left( \frac{-1}{4}\sin \left( \frac{x-y}{2} \right)\sin y \right)\left( \frac{-5}{4}\sin ...
0
votes
1answer
107 views
Why am I not getting Indeterminate for f[1] when f[x_] = (x - 1)/(x - 1)? [closed]
In Mathematica 9 If I write:
f[x_] = (x - 1)/(x - 1)
I get
1
And if then I write:
...
0
votes
1answer
118 views
Random sample with gap sizes
Lets say I have 101 instances of data with multiple attributes. In particular case, one attribute has 7 unique values. I want to get ...
30
votes
2answers
719 views
What is the difference between Reduce and Solve?
Solve and Reduce both can be used for solving equations.
Just by operating them, I know there is little difference between them.
But, the only thing I know is that there is little difference, and I ...
9
votes
2answers
196 views
Define Log so that negative reals evaluate on lower edge of branch
I need to get Mathematica to evaluate the logarithm of a negative real number using the lower branch instead of the upper branch, so that while
...
12
votes
3answers
389 views
How to make the suggestion box appear?
When you type a function in Matlab, quickly a suggestion box comes up showing functions similar to the one you're typing. I thought that Mathematica didn't have this but one day, I typed half of a ...
5
votes
3answers
161 views
How to rename a built-in function?
I want a built-in function renamed without loss of any properties, I want the shorter name to appear in all results and to be recognized as input. Is it possible?
1
vote
1answer
154 views
Filtering Lists in Mathematica [duplicate]
Possible Duplicate:
Select/Delete with Sublist elements?
I need help in filtering long lists of x,y coordinates.Lets use the following list as an ...
-2
votes
1answer
163 views
How to pass arguments between functions
I have two Functions, f[] and g[]. f is passed some values ,say ...
4
votes
6answers
172 views
Filter list with different list in it
I have a list like:
{{{4, 14}, 1}, {{4, 15}, 1}, {{4, 16}, 1}, {{4, 17}, 1},
{{4, 18}, 1}, {{4, 14}, 3}, {4,15}, {{4, 16}, 2},{4,18}}
Now I want to ...
8
votes
1answer
148 views
user defined functions, how to save them for future use?
I need certain user defined functions over and over. I was wondering how can I define and where and how to save them such that each time I start a notebook, these functions are available and need not ...
0
votes
1answer
276 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 ...
2
votes
0answers
76 views
Evaluating a function on permutations of its arguments
Say I have a function "temp" of $n+1$ variables, $y,z1,z2,z3,...,zn$. I want to test if my function has certain symmetries like swapping $y$ with square of any $z$, swapping any two of the zs, ...
0
votes
1answer
101 views
Solve 1-D function that has 2-D interpolating functions
I need some helps on NDSolve. Here are my equations:
...
3
votes
0answers
256 views
How can I solve this complicated custom function numerically?
I have a complicated function that calculates the total value of payments from an account into which deposits are made annually. I'd like to solve the function for a growth rate numerically, but ...
4
votes
2answers
190 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:
...
2
votes
1answer
99 views
Difference between function definitions [duplicate]
Possible Duplicate:
Functions vs. patterns
I thought about describing the context in which I faced this problem, but I figured it is general enough and clear enough to pose it as it is.
...
8
votes
1answer
208 views
Better Autocompelete for the Front-End
I wonder if it is possible to improve the front-end's autocomplete capability. Compared with some other more sophisticated editors/IDEs, such as eclipse, Mathematica's front-end does not provide a ...
8
votes
1answer
109 views
Get the name of a symbol passed to a function
I'm trying to get the name of a symbol passed to a function with this:
f[x_] := {SymbolName[x], x}
SetAttributes[f, HoldFirst]
x = 5;
f[x]
But ...
1
vote
1answer
105 views
Can I get a trace of the complexity of a convergent sum?
Motivation--- I have a glimmer of an idea that a convergent sum could be considered a self-referential number similar to a fractal. I would like to play with it for a while.
I have the following ...
2
votes
1answer
92 views
Precise Timing for nested functions, how to? [duplicate]
Possible Duplicate:
Profiling from Mathematica
How can I easily get fractions of timing for each nested function?
Consider a nested call like this:
...
4
votes
3answers
291 views
Simplify function notation
I have some calculations with arbitrary functions. In the output, Mathematica always shows the functions with its arguments. I would like to tidy the notation a bit, by hiding the arguments in the ...
0
votes
2answers
77 views
Saving variables from nested function
There has to be a simple solution for my question:
I have three functions and each uses the output from the previous function as its input:
...
1
vote
1answer
73 views
Why function is evaluated backward?
I have a simple function:
f[x0_,y0_]:= Module[{x=x0,y=y0},For[i=0,i<2,i++;Print[x],Print[x+y]];]
So when I call it:
...
1
vote
1answer
105 views
How can I create some shorthand notation for a custom control?
Per this question, I have created a custom graphical control object which evaluates to a list of values. I would like to be able to create such an object quickly, rather than typing some command, ...
1
vote
1answer
116 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
...
3
votes
2answers
161 views
Numerically finding a derivative jump of a function
How would I numerically find where a function has derivative jumps?
In particular, I'm working with this function:
...
7
votes
2answers
225 views
Moving the location of the branch cut in Mathematica
According to the documentation, Mathematica chooses the branch cut for $\log(z)$ to lie along the negative real axis. It it possible to change this so that it lies along the positive axis or elsewhere ...
39
votes
2answers
777 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 ...
0
votes
1answer
174 views
How to create function that classifies sample data
I want to create expression, that classifies samples ( 4 weather features -> decision).
Example training data:
For the values that i have data for, I can use rules:
...
2
votes
1answer
159 views
Plot maximum and minimum temperature of a day for range of time interval
How to display (in any graphic representation) the maximum and minimum temperatures for one city in one of these selected time periods over the 5-day period? The time periods are:
Morning (06:00 to ...
2
votes
1answer
246 views
How to define the Einstein summation convention in Mathematica?
How to define a Einstein summation convention in Mathematica?
Say, how to let Mathematica know T[i,i] equals ...
4
votes
1answer
282 views
Evaluate continued fraction
Mathematica has the ContinuedFraction[] function to give the continued fraction expansion of a rational (or approximation of a real) number. I'm interested in the ...
2
votes
3answers
582 views
How can I differentiate Numerically?
Mathematica has two ways to integrate: Integrate and NIntegrate.
But what about D? ...
2
votes
1answer
119 views
#[[1]]//FullForm = 1?
I have a set of symbolic algebraic expressions that I'm trying to get some speed into. To illustrate the issue, I'll use a simple form like { k0 X, k1 Y, k1 Z}, ...
2
votes
1answer
217 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:
...
0
votes
1answer
171 views
How do I numerically solve a custom function?
Whenever I use functions like FindRoot or NDSolve, it sends x through the function and deals ...
6
votes
1answer
164 views
GeneralMiniMaxApproximation - Dividing out the zero
MiniMaxApproximation is used to generate minimax approximations. I'm interested in the "dividing out the zero" trick.
The documentation discusses a nice example. Suppose we want to construct a ...
1
vote
2answers
281 views
Interpolating a function of two variables
I am trying to create the interpolating function for a function of two variables, over a finite area. Just for consistency we can think of a function:
...
9
votes
2answers
375 views
3
votes
3answers
404 views
Passing a function as an argument of another function [duplicate]
Possible Duplicate:
Pass function or formula as function parameter
I am trying to implement a simple Plot[]-like function, with the same synopsis; my first (and unique so far) try would be ...
8
votes
1answer
322 views
Growth of functions
Does somebody know if Mathematica can be used to calculate the growth of functions, that is in Big O, Theta, and Omega and find proper $n_{0}$ and $c_{1}$, $c_{2}$ respectively?
5
votes
0answers
119 views
What Method options does FindInstance accept?
While answering Trouble getting FindInstance to return multiple results for certain constraints it became clear that for this problem FindInstance would be better ...
4
votes
3answers
278 views
25
votes
2answers
3k views
What is so special about Prime?
When we try to evaluate Prime on big numbers (e.g. 10^13) we encounter the following issue :
...
5
votes
2answers
115 views
A command for outputting a list of parameter values in a Manipulate interface
I am looking for a command that will output a list of values that correspond to the current parameter values manually set on a particular Manipulate interface.
For ...
4
votes
2answers
181 views
How to make a function that evaluates an expression?
I'm trying to make a function where the input is an expression, but somehow it just won't be evaluated. For example, this little function doesn't work:
...
2
votes
1answer
197 views
Plugging values into functions
I am very new to Mathematica, and need to know how to plug values into existing functions. For example, Math World supplies the following code for building a truth table of ...
13
votes
4answers
885 views
sprintf() or close equivalent, or re-implementation?
Is there a sprintf() command (some command that takes a printf-style format string and a list of values to insert into the ...
2
votes
1answer
130 views
Creating a matrix from the output of a variable inside a for loop
I would like to enter the results of the following loop inside a matrix as its elements:
...
