When I use the code syms x; c = coeffs(3*x^2, 'All'); 3*x^2 displays not [3, 0, 0] how can I fix that?
1 visualización (últimos 30 días)
Mostrar comentarios más antiguos
SciFiPhysics Guy
el 3 de Abr. de 2016
Comentada: Star Strider
el 3 de Abr. de 2016
When I use the code syms x; c = coeffs(3*x^2, 'All'); 3*x^2 displays not [3, 0, 0]; how can I fix that? I'm actually wanting to use a code more like: syms x y; c = coeffs(y*x^2, y,'All') but that displays "Error using sym/coeffs Too many input arguments." Any help here would be greatly appreciated! Thanks!
0 comentarios
Respuesta aceptada
Star Strider
el 3 de Abr. de 2016
It works for me in R2016a:
syms x
c = coeffs(3*x^2, 'All')
c =
[ 3, 0, 0]
The current online documentation is for R2016a. If you’re using a prior release, the online documentation might not apply. There have recently been significant changes between versions.
The sym2poly function will produce the same result if you need it for other calculations:
f = 3*x^2;
p = sym2poly(f)
p =
3 0 0
That should work in previous releases as well.
2 comentarios
Star Strider
el 3 de Abr. de 2016
My pleasure!
I went through the online documentation to look up the R2015b and R2016a documentation for coeffs. The 'All' option is indeed new in R2016a. (It wasn’t mentioned in the Release Notes, so I had to go digging.)
The sym2poly work-around is the best I can do.
Más respuestas (0)
Ver también
Categorías
Más información sobre Assumptions en Help Center y File Exchange.
Productos
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!