Matlab is unable to evaluate very a very long expression
4 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
Dominik Hiltbrunner
el 5 de Nov. de 2021
Editada: Dominik Hiltbrunner
el 5 de Nov. de 2021
Attached to this post is a text file containing a very long expression.
I want to evaluate this expression numerically in a Matlab function, i.e. something like this:
function result = (<long lost of all the parameters>)
result = '<this very long expression from the text file>'
end
The computer gets stuck when doing so, not returning a result even after hours of running.
Is there anything I can do to speed up the computation of very long expressions?
2 comentarios
Stephen23
el 5 de Nov. de 2021
Note that you should replace all of the ^(1/2) with SQRT.
What sizes are the input arrays?
Are you intentionally using matrix operations instead of array operations everywhere in this code?
Respuesta aceptada
Steven Lord
el 5 de Nov. de 2021
How did you generate this long expression? Did you generate this using Symbolic Math Toolbox? If so consider using matlabFunction to create a function file from this expression (leaving the 'Optimize' option set to its default value of true) and see if the optimization process simplifies the computation of that expression by extracting out some common terms that it can compute once and use repeatedly.
1 comentario
Dominik Hiltbrunner
el 5 de Nov. de 2021
Editada: Dominik Hiltbrunner
el 5 de Nov. de 2021
Más respuestas (0)
Ver también
Categorías
Más información sobre Logical en Help Center y File Exchange.
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!