Questions tagged [expression-construction]
The expression-construction tag has no usage guidance.
12
questions with no upvoted or accepted answers
3
votes
0
answers
183
views
Computations with OptimizedExpressions without completely expanding them
I have to manipulate huge expressions that are rational functions of many (∼30) variables with integer coefficients. Storing them just as a ratio of two polynomials would be impractical. But they can ...
- 7,273
2
votes
0
answers
116
views
Store pattern names in variables, and use them in Condition (/;)
I am trying to create patterns whose form is not hard-coded, and which are not explicitly directly written. For that I want to use one list of pattern names to name some parts of a ...
- 483
2
votes
0
answers
34
views
Setting pieces of "matrices" - unwanted behavior
I am constructing matrices whose elements are lists themselves (of varying length), and am (re)setting the entries of these matrices using among others the "All" command. It seems that in ...
- 332
2
votes
0
answers
60
views
How to do an arbitrary expression growth in Mathematica?
I want to write a function that can be used to grow an expression from a seed or another existing expression based on part specification.
...
- 9,523
1
vote
0
answers
107
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Is there a good reason why `Slot[]` is not an atomic expression?
Here's a good reason why I think it should be,
Map[ If[AtomQ@#, #->"is an atom", #->"not an atom"]&
, {"hello",Range@3, # &}
, {-1}
]
...
- 2,060
1
vote
0
answers
108
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How to send Map[Plus[1, #] &, {1, 2, 3}] to Mathematica from C# via IKernelLink?
Here is a piece of my code
...
- 11
1
vote
0
answers
85
views
How Defer[1+Evaluate[1+1] work?
I want to generate some expressions.
The expression is not evaluated expect some parts will evaluate first.
A simple example is
Defer[1+1+1] and in this expression ...
- 741
1
vote
0
answers
94
views
0
votes
2
answers
132
views
Elegant way to validate expression?
Suppose I'm using the expression Person[fn_String, ln_String] as a data expression, and want to prohibit the creation of expressions where ...
0
votes
0
answers
50
views
How to generate nested expression?
I've found some related questions, but nothing has really helped me to do what I want to do.
Given a list of variables L and a parameter ...
- 1,613
0
votes
0
answers
103
views
Generate a system of linear differential equations from a coefficient matrix
I want to generate a system of linear equations that is stable. For that I generated random coefficients and divided the 10 by 10 matrix by the largest eigenvalue and set the diagonal to -1:
...
- 2,995
0
votes
0
answers
64
views
Determine class of special function from algebraic constraints?
Consider vectors x_i in arbitrary dimension. Let's say I have an expression in six variables F[x_1,x_2,x_3][x_4,x_5,x_6], which ...
- 12k