Unable to sort symbolic variables in matlab

3 visualizaciones (últimos 30 días)
Aftab Ahmed Khan
Aftab Ahmed Khan el 24 de Feb. de 2016
Comentada: Aftab Ahmed Khan el 24 de Feb. de 2016
There is a an issue in one section of my code. Let I have this symbolic equation. When i use the coeffs function like this it gives me the right coefficients and variables.
eq=(10219275*P10_10)/2097152 - P10_9/10 - P9_10/10
[a,b]=coeffs(eq);
a =
[ -1/10, 10219275/2097152, -1/10]
b =
[ P10_9, P10_10, P9_10]
but i want it to return me the variables and its coefficients in this order. How can i go about this rearrangement.
b =
[ P9_10, P10_9, P10_10]
Please help me.

Respuesta aceptada

Star Strider
Star Strider el 24 de Feb. de 2016
You can tell coeffs the order in which you want the coefficients returned:
syms P10_9 P10_10 P9_10
eq=(10219275*P10_10)/2097152 - P10_9/10 - P9_10/10
[a,b]=coeffs(eq, [P9_10, P10_9, P10_10])
a =
[ -1/10, -1/10, 10219275/2097152]
b =
[ P9_10, P10_9, P10_10]
  4 comentarios
Walter Roberson
Walter Roberson el 24 de Feb. de 2016
Sort order is first by the number after 'P' and before the '_', and secondarily by the number after the '_'
Aftab Ahmed Khan
Aftab Ahmed Khan el 24 de Feb. de 2016
Well, i have managed to do it in another way found on the internet. Thanks once again.

Iniciar sesión para comentar.

Más respuestas (1)

Walter Roberson
Walter Roberson el 24 de Feb. de 2016
Use http://www.mathworks.com/matlabcentral/fileexchange/10959-sort-nat--natural-order-sort a "natural sort" on the output of symvar() to get the order you want to do the sorting in, and then pass the sorted result as the second parameter of coeffs

Categorías

Más información sobre Shifting and Sorting Matrices en Help Center y File Exchange.

Etiquetas

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by