release structure
3 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Dear all:
I try to set a separate file for parameters in a model, and I want to retain their name so later on I can do sensitivity analysis using string comparison to identify the parameter name. So I define my parameters into structures, such as:
param.eps = 6;
param.beta = 0.99;
param.theta = 0.7532;
param.gamma = 0.5;
I want to release the structures into into variables as the following:
eps = 6;
beta = 0.99;
theta = 0.7532;
gamma = 0.5;
Is there an automatic way for doing this? I suspect I can setup the structure contains the name and value separately, and I probably can run a loop to equate the name with the value. But I think there must be a quicker and better way of doing this...
Any comments will be appreciated.
Cheers
Ben
0 commentaires
Réponse acceptée
Jan
le 1 Août 2011
Staying at the structs has some benefits if you use dynamic field names:
param.eps = 6;
param.beta = 0.99;
param.theta = 0.7532;
param.gamma = 0.5;
fields = fieldnames(param);
for i = 1:length(fields)
aField = fields{i};
fprintf('%s = %g\n', aField, param.(aField));
end
If you assign the variable "eps" dynamically, you will overwrite the built-in function with the same name. Such tricks will impede the debugging dramatically!
But if you really have a really good reason to need this really:
function FieldToVar(S)
F = fieldnames(S)
for i = 1:length(F)
aF = F{i};
assignin('caller', aF, S.(aF));
end
This is faster than an equivalent EVAL approach and less dangerous. Nevertheless, I think, this method is worse than using the dynamic field names directly.
0 commentaires
Plus de réponses (1)
Oleg Komarov
le 1 Août 2011
Why would you like to do such a thing?
% A method that avoids eval:
fnames = fieldnames(param);
save('param.mat','-struct','param')
load('param.mat')
delete('param.mat') % Or save it in the temp folder
2 commentaires
Oleg Komarov
le 1 Août 2011
Why can't you keep the structure. It's there for this reason and allows you to dynamically index the fields.
Voir également
Catégories
En savoir plus sur Structures dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!