Questions tagged [simplification]
249 questions
1
vote
1 answer
Mesh simplification for regular surfaces except details
I need to prepare 3D mesh of car seat to further dynamic analysis. Because the mesh has high resolution it is necessity to make a simplification using one of the available options in MeshLab. What module I have to use to get the mesh with lower…
Jaumenik
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- 6
1
vote
2 answers
Why Simplify[1/Sqrt[a] == Sqrt[1/a] doesn't give a "true" output in Mathematica?
In Mathematica, Simplify[1/Sqrt[a] == Sqrt[1/a]] gives Sqrt[1/a] == 1/Sqrt[a]. I don't really see why this doesn't give a true output when, FullSimplify gives the desired result.
This probably is a very dumb question, but I just don't see it.
Wille Bell
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1
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1 answer
How to fix my simplification function for power rule (to make results easier to read) for a working Symbolic differentiation function in Racket?
This is my function for differentiation that works correctly.
#lang racket
(define (diff x expr)
(if (not (list? expr))
(if (equal? x expr) 1 0)
(let ( (operation (car expr))
(u (cadr expr))
(v (caddr expr)))
…
Royale_w_cheese
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- 9
1
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1 answer
How do you convert a string to a Sympy expression without simplifying?
I would like to use a function like sympify in order to convert the string "c+1+1" into a Sympy expression. However, I don't want it to simplify.
Right now, I do
from sympy import sympify
print(sympify("c+1+1")) # >> c + 2
The docs mentioned…
Pro Q
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1
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1 answer
Correlated row-generating query in Oracle
Given this starting CTE:
WITH Sections AS (
SELECT 1 Section, 1 StartUnit, 5 EndUnit FROM DUAL
UNION ALL SELECT 2, 0, 2 FROM DUAL
UNION ALL SELECT 3, 1, 1 FROM DUAL
),
How do I generate a result set that has as many rows per row in…
ErikE
- 48,881
- 23
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1
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1 answer
cgal:surface simplification and keep texture map
I would like to use the surface simplification algorithm of CGAL with wavefront object.
I can get a good result by using the edge_collapse function. But my 3D models have texture maps, I can't use the original texture map information for the reduced…
jmy
- 11
- 1
1
vote
1 answer
How to simplify terms with usage of square root in maxima
Let's say we have a term like 1/4 * x/sqrt(2) * x^2 / 2; in Maxima.
As an output (without further modification) it gives x^3/2^(7/2).
How can I force the output format to be like x^3/(8*sqrt(2)) with usage of square roots whenever possible?
Nico
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- 2
1
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0 answers
What is the best algorithm for optimizing a procedurally generated indexed mesh with normals and UV maps?
I'm working with procedurally generated shapes that have UV mapping, normals, and vertices/indices. I've found a couple algorithms for optimizing and lowering the poly count of indexed meshes but none of them seem to take normals and UV maps into…
user3441843
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2 answers
Python: Simplify a Counting Program
I'm very new to Python and I've made a program which asks a user to select 2 numbers. The first must be between 1 and 10 and the second must be between 100 and 200. The program then asks the user to select a 3rd number between 1 and 5. Call these…
Nellington
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1
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1 answer
Simplification of nested for loop
This code works, but I believe it can be made simpler, also allowing extra pieces to be included without all the hassle of adding lines to the nested loop. How?
#--------------------------------------------------------------------------- …
egilk
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1
vote
1 answer
Boolean Simplification
I have a boolean simplification problem that's already been solved.. but I'm having a hard time understanding one basic thing about it.. the order in which it was solved.
The problem is simplifying this equation:
Y = ¬A¬B¬C + ¬AB¬C + A¬B¬C + A¬BC +…
Sam
- 13
- 2
1
vote
2 answers
Boolean Logic Simplification Issue
I hate this stuff.
Just to note. + means OR * means AND ! means NOT.
(A+B) * (A+C) * (!B + !C)
(A | B) & (A | C) & (!B | !C) // more conventnal
The answer is A(!B + !C)
I'm trying to get there.
So I start off with using Distributive rule which gets…
Doug
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1
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3 answers
Correct usage of arrayfun/bsxfun in Matlab - simple example
Assume we have a 1-d Matrix, with random length:
M = [102,4,12,6,8,3,4,65,23,43,111,4]
Moreover I have a vector with values that are linked to the index of M:
V = [1,5]
What i want is a simple code of:
counter = 1;
NewM = zeros(length(V)*3,1);
for…
Jonas
- 308
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1
vote
1 answer
Expression Simplification using SymPy trigsymp
Why does the following simple example not return 1?
from sympy import *
r, theta, phi = symbols('r, theta, phi')
pprint(trigsimp(cos(phi)**2 * sin(theta)**2+sin(phi)**2 * sin(theta)**2
+ cos(theta)**2))
Instead, I get
2 2 2 …
pawel_winzig
- 902
- 9
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1
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1 answer
Simplify expressions with nested ∃ and an equality
I came across a proof that I could not easily automate until I threw this lemma into Isabelle’s simplifier set:
lemma ex_ex_eq_hint:
"(∃x. (∃xs ys. x = f xs ys ∧ P xs ys) ∧ Q x) ⟷
(∃xs ys. Q (f xs ys) ∧ P xs ys)"
by auto
Now I am wondering:…
Joachim Breitner
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