Diferencia entre revisiones de «Triangulación de peso mínimo»
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== Referencias == |
== Referencias == |
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{{refend}} |
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==Enlaces externos == |
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*[http://code.google.com/p/minimum-weight-triangulator/ Minimum Weight Triangulation using an LMT Skeleton source code]' |
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[[Categoría:Algoritmos geométricos]] |
[[Categoría:Algoritmos geométricos]] |
Revisión del 15:51 20 feb 2017
En geometría computacional, se denomina problema de triangulación de peso mínimo al problema de encontrar una triangulación de longitud de borde total mínima.[1] Es decir, dado un polígono de entrada (o el cierre convexo de un conjunto de puntos de la entrada) encontrar la subdivisión del mismo en triángulos adyacentes, de tal manera que se minimice la suma de los perímetros de los triángulos. El problema es NP-duro para entradas consistentes en conjuntos de puntos, pero puede ser aproximado con cualquier grado deseado de exactitud. Si la entrada consiste en un polígono, puede ser solucionado exactamente en tiempo polinómico. La triangulación de peso mínimo también se ha denominado a veces la triangulación óptima.
Historia
El problema de triangulación de peso mínimo de un conjunto de puntos fue propuesto por Düppe y Gottschalk (1970) , quienes sugirieron su aplicación a la construcción de redes irregulares de triángulos para representar contornos terrestres , proponiendo un algoritmo voráz para aproximarlo. Shamos y Hoey (1975) conjeturaron que la triangulación de peso mínimo siempre coincidiría con la triangulación de Delaunay, pero esto fue rápidamente refutado por Lloyd (1977), y de hecho Kirkpatrick (1980) mostró que los pesos de las dos triangulaciones pueden diferir por un factor lineal.[2]
El problema de triangulación de peso mínimo se hizo notorio cuándo Garey y Johnson (1979) lo incluyeron en una lista de problemas abiertos en su libro sobre completitud NP, y muchos autores posteriores publicaron resultados parciales sobre ello. Finalmente, Mulzer y Rote (2008) demostró que el problema era NP-duro, y Remy y Steger (2009) mostró que es posible construir aproximaciones al mismo de forma eficiente.
Complejidad
El peso de una triangulación de un conjunto de puntos en el plano euclídeo está definido como la suma de longitudes de sus bordes. Su problema de decisión consiste en decidir si existe alguna triangulación de peso inferior a un peso dado. Se demostró que este en un problema NP-duro por Mulzer y Rote (2008), mediante una demostración por reducción de grafo plano 1-EN-3, un caso especial del problema de satisfacibilidad booleana en el que un 3-CNF cuyo grafo es planar es aceptado cuándo satisface la condición un literal en cada cláusula. La demostración empleó ayuda de un ordenador para verificar el comportamiento correctode la misma.
No es sabido si el problema de triangulación de peso mínimo es NP-completo, ya que este depende del problema aún abierto de determinar si la suma de radicales puede ser computada en tiempo polinómico. Aun así, Mulzer y Rote remarcaron que el problema es NP-completo si los pesos de borde son redondeados a valores enteros.
Notas
- ↑ For surveys of the problem, see Xu (1998), Levcopoulos (2008), and De Loera, Rambau y Santos (2010).
- ↑ See also Manacher y Zobrist (1979).
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