Questions tagged [attributes]
Questions on attributes of functions.
140
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Setting PlotRange conditionally
I have several sets of data, and each set of data has a different scale (i.e., a different range of function values). I wish to plot each data set separately. I can do this using ...
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0
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39
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Can I define relations without explicit transformation rules?
Is there an alternative way to use Mathematica for symbolic algebra, where instead of defining explicit transformation rules into 'canonical form', I can instead 'gently inform' Mathematica about ...
- 1,089
4
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2
answers
122
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Replace vs. ReplaceAll involving Flat
I'm aware that Replace and ReplaceAll behave differently as discussed in this question, but still get confused with the ...
- 2,183
2
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0
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32
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Attributes for functions with currying [duplicate]
Is there a way to set attributes for a function which holds for all arguments when currying?
When evaluating, e.g.,
...
- 1,460
11
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2
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204
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How to make a function with two patterns listable?
Suppose that I have a function that has two patterns:
disksConstantRadius[radius_][points_] := Disk[#, radius] & /@ points
(noting that this would be better---...
- 3,926
4
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129
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How to construct the HoldAll version of Information[]?
When building other functions I need the HoldAll version of Information, and the usual method seems not to work.
Firstly as a ...
- 2,183
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2
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150
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How to define a function to be numeric when the input is purely symbolic
My goal is to have NumericQ[h[j]]=True for any j regardless of whether j may be symbolic with no defined value.
Setting NumericQ[h[j_]]=True does not work and as I understand the NumericFunction ...
- 5,637
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1
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36
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index as an attribute for a function containing data frame
Two questions. I have created a sample problem, and would be glad to have your help.
I have 2 functions, fun1 and fun2, and one ...
- 877
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1
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71
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SetAttribute for indicized variables? [duplicate]
Is there a way to SetAttributes to a function defined like this:
fun[t_][x_,y_]
Something like ...
- 6,525
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2
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114
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How can I remove the attributes "Orderless" from function Times stably and reliably?
Recently I have been doing some algebra of partitioned matrices, where product like below is common:
where $A_{11}, A_{12}, X, Y$ are all partitioned matrix blocks thus all are matrices in essence.
...
- 463
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112
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How to make a function in terms of constants to inherit the attribute of being constant
I have defined two variables a and b:
SetAttributes[a, Constant];
SetAtributes[b, Constant];
I have defined a function c as ...
- 370
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46
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Defining a function expression [duplicate]
I'm sure this has been answered before, but imagine I have the following function
...
- 4,187
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80
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Construct really identical function (the same as Length)
In[1] Length[Unevaluated[1 + 1 + 1 + 1]]
Out[1] 4
Q1) Can we construct a function named f, such that ...
- 4,037
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51
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HoldAll doesn't work for List or BlankSequence?
Consider the following function:
f[arg_] := Print[Unevaluated[arg]];
Attributes[f] = HoldAll;
The purpose of the function is to print the arguments unevaluated. In ...
- 117
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81
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Defining a two-variable function with a parity property
I would like to define a function that has the following property $f(-x,y)=f(x,-y)$.
An example is $f(x,y)=x y$. For simple inputs, I can impose this easily enough as:
...
- 189
2
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73
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Example of when explicitly using MapThread is better than giving a function the Listable Attribute
This answer says that Listable just makes the function automatically apply MapThread to its arguments.
Does anyone have a simple ...
- 789
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0
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81
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Ways to hide a secret token with some code?
I worked out a way to prompt notifications to peopel using my mathematica code that a new version is available. My code is in a private github repository, mathematica can access it using http requests ...
- 349
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59
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How to define a function that acts invidually on a varible number of arguments
I am trying to generate a function that applies to each argument for any number and type of arguments. The function might work like this:
...
- 2,397
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54
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Extracting name of symbol (variable name) from within a function not working
Abstract: I use a pattern so often that I needed to make a function for constructing it. A function getName[...] for extracting name of variable and value only ...
- 2,397
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132
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head of a sequence
Why does Head[Sequence[b, c]] return c[Symbol] and not Sequence?
Why does ...
- 1,596
7
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2
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215
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Defining a function which is numerical on all vectors of arguments
There is an attribute NumericFunction in Mathematica that can do the following job:
...
- 229
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1
answer
55
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Attributes for private functions
I am not sure if what I want to do can be done, but I thought to ask anyway.
Note: I already have in hand a workaround, I was just wondering for the power/simplicity that Mathematica may provide.
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276
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Define symmetric function for a subset of variables
I apologize if this question has been asked already. I did some research and found some solutions but none of them was general enough for what I need.
So, I defined the following function:
...
- 157
2
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2
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79
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Evaluation Control for interpolating functions
I would like to find the root of the third component of an interpolating function, here e.g. a BezierFunction p:
...
- 1,017
1
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1
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45
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FilterRules works in DateListPlot but not in Plot
I just experience the following problem (this is a MWE just to illustrate). First DateListPlot
...
- 5,563
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0
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45
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How to make a Flat function return x when evaluated as f[x]? [duplicate]
With SetAttributes[f, Flat], f[a_] can get matched to f of any number arguments. How can I ...
- 1,790
2
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1
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53
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Using the value of OptionValue to clear a list
I'm currently using OptionValue inside a function, the Option I passed to the function should be cleared, then populated with ...
- 177
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2
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122
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When do functions apply on lists and when they do not
I have read in my lecture notes on Mathematica that functions (in the general sense) can be applied to lists of data and that they can return new lists with data. I have tried this and I have got ...
- 530
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160
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Is it possible to make listable Experimental`NumericalFunction?
I have been playing a bit with the undocumented function
Experimental`CreateNumericalFunction
and I wanted to know if somebody found a way to make generated ...
- 585
3
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2
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158
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Construct a function that maps strings to functions
The main question is the last 5 lines (including codes) of this article.
A[x_, y_] := Evaluate[ToExpression["x^2+y^2"]]
A[3,4]
Then the output becomes
...
- 4,037
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0
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39
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Mathematica: Remove argument from object with flat attribute
I have an object in mathematica with the attributes Flat and OneIdentity. I also defined the following substitutions:
...
- 21
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1
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46
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Mapping function into elements of Sum
I'm trying to set an attribute that's valid for a generic sum, where n and f are arbitrary.
de[A_ + B_] := de[A] + de[B]
de@Sum[f[i], {i, n}]
Is this possible?
...
- 433
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2
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146
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Returning the argument of a function if the argument is not of the right type
Best to give an example. Let us consider the function AdjacencyMatrix. When we pass, say a matrix to it, we get:
...
- 1,284
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56
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Preventing an output of a function from being assigned a value
Say I have a function
Example[n_Integer]:=n{x,y,z}
Example@4
{4 x, 4 y, 4 z}
Now, let us assign some values to ...
- 1,284
2
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2
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75
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How can one eliminate results in which symbols are assigned constant values?
As an exercise (pertaining to my posting Perform a constrained integration over $[-1,1]^6--yielding a "separability probability"), I issued the command
...
- 2,315
1
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2
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307
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Computation with arrays of numbers
My code is
m = RandomVariate[NormalDistribution[], 100];
c = 0.1;
f1 = RandomVariate[NormalDistribution[], 100];
F = Sqrt[c]*m + Sqrt[1 - c]*f1;
I would like to ...
- 11
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412
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Defining an operator with given properties
In symbolic derivations with Mathematica, one often needs to define an operator with some desired properties, which will be used to stand for a general function or transform.
For example, I would ...
- 165
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60
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ScrollPosition Synchronization
Two separate Panes. Pane-1 with vertical scroll bars and Pane-2 no scroll bars. Need to sync the scrolling between them. When scrolling Pane-1 vertically, need to have pane 2 automatically scroll to ...
- 81
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227
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Fast and Listable Piecewise function
I am writing a simulation where I have an array with ten columns and on the order of millions of rows, for which I need to iterate on the order of ten thousand times, making computation time a major ...
- 927
3
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1
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106
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HoldFirst being overridden by Activate [duplicate]
So here's the problem
a=1;a=2
works because of the HoldFirst attribute of Set, so that it ...
- 1,993
6
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2
answers
271
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Flat attribute : example I don't understand
I am just beginning to learn about attributes of function in mathematica.
I saw the example "Flat". But there is something I don't get :
...
- 2,114
1
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1
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165
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Problem displaying Killing equations
What I'm trying to do is to compute the Killing equations and then solve them using DSolve to determine their solutions.
I have a problem understanding where my Mathematica program doesn't work ...
- 13
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1
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72
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How can I get all the order of a list? [closed]
I have a list such as : {1,3,6}, then, I want to get all the orders of it, I do not know which function is easier. I have to try this code, but it is complex.
...
- 121
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93
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Pattern matching on Orderless functions
I'm trying the following pattern matching command:
ReplaceList[Hold[b + a], Hold[x___ + y___] -> {{x}, {y}}]
And Mathematica returns:
...
- 19
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1
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196
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Pick the solutions that satisfy certain conditions
I have a large system of ODEs, and I find a large number of steady-state solutions. But many of them do not satisfy the condition that all the variables must have ...
- 5,305
7
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4
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567
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partial numerical evaluation
Context
The following is an issue I have come across many times and still do not have a satisfactory solution for.
The context of it is this. Let's say we have an equation, a linear ODE for the ...
- 1,223
2
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0
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71
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non listable plus and times [duplicate]
I am trying to create my own Plus and Times functions, which are identical to the built in ones with the exception that they are ...
- 1,223
5
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1
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116
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Subtle order-of-evaluation issues when pattern-matching with attributes
Related question concerning unrolling the tests that are shown below:
Big and Little surprises when unrolling tests of pattern-matching and attributes
Questions researched before posting this one:
...
- 8,651
3
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1
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105
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Big and Little surprises when unrolling tests of pattern-matching and attributes
Related question concerning interpretation of the substitutions:
Subtle order-of-evaluation issues when pattern-matching with attributes
Questions researched before posting this one:
Orderless ...
- 8,651
1
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0
answers
83
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Is it possible to modify the behavior of Listable?
Is it possible to achieve Thread-like behavior using the Listable attribute either on a symbol or in a pure function (or ...
- 4,155